17700( 11) - 28-Apr-2026 19:41:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17700 Version: 11 Check-in Time: 28-Apr-2026 19:41:16 STScI Edit Number: 9 Title Separating Accretion and Magnetic Activity in Young Brown Dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Christopher Michael Rice University Y Johns-Krull CoI: Dr. Laura Flagg The Pennsylvania State University N CoI: Dr. Lisa Prato Rice University N CoI: Dr. Gregory J. Herczeg Peking University N CoI: Prof. Kevin France University of Colorado at Boulder N CoI: Ms. Toni V Panzera Rice University N ------------------------------------------------------------------------------------ Abstract Several recent studies have begun to explore accretion physics on planetary mass objects orbiting young stars; however, many of these studies highlight uncertainties in the accretion models used to interpret the observations. The models have been developed and calibrated for stellar accretion. Do they apply to planetary mass objects? Young brown dwarfs provide a natural bridge for connecting accretion studies from stars down to planetary mass obejcts. A key difficulty in diagnosing excess emission produced by accretion is to properly account for emission produced by magnetic activity. This is particularly true for line emission. We will study the FUV and blue optical emission of a sample of a dozen young brown dwarfs spanning the mass range from near the stellar limit down to near the planetary mass limit. Half of our sources show evidence for accretion while half do not. We will use these data to separate out the role of accretion and magnetic activity in producing the observed excess emission in order to test the applicability of models of stellar accretion to very low mass objects such as young giant planets. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe each target with COS+G160M with a CENWAVE of 1533 AA. This will deliver spectra in two segments spanning the wavelength ranges 1342 - 1515 Ang and 1533 - 1707 Ang, containing the important accretion and activity diagnostics of Si IV at 1400 Ang, C IV at 1550 Ang, He II at 1640 Ang, C I at 1656 Ang, and Al II at 1671 Ang. COS+G160M is the most sensitive instrument available to observe at these wavelengths and will provide a spectral resolution of ~15, 000 which will give us sensitivity to line broadening and mass motions. Most accreting CTTSs have C IV lines substantially broader than non-accreting T Tauri stars (Ardila et al. 2013, ApJS, 207, 1) which derive their C IV emission from magnetic activity. Thus, the line shape provides an additional check with the line strength to indicate whether accretion is occuring. Because it is always possible a flare will occur, we will take our spectra in TIMETAG mode at no cost to S/N. A flare would produce ancillary science that will 17700( 11) - 28-Apr-2026 19:41:16 - [ 2] be very interesting but is not the focus of this program. Our targets are in the Taurus star forming region and are selected from Esplin and Luhman (2019, AJ, 158, 54). EL19 analyse the full SED of each object and categorize objects as having primordial accretion disks, transition/debris disks, or not having a disk. We assume the objects with primordial disks are accreting, and 6 of our targets (numbers 7, 1, 2, 9, 5, and 12) are these accreting stars. The other 6 all do not have a detectable disk and are assumed to not be accreting. EL19 provide extinction (A$_J$) for each object as well, and we use these in our ETC calculations. Our primary goal is to measure the C IV and other emission lines noted above from these 12 objects and to show the accretors have substantially more emission than the non-accretors. Because accretion in young stars is primary diagnosed by blue optical spectra that span the Balmer jump, we also include an observation of each target using STIS G430L observations covering wavelengths of 3000 - 5700 Ang. Ideally, the COS and STIS observations should be taken as close in time as possible; however, we separate them to facilitate scheduling because of SAA passage, but group them together so that they are taken within a day. This is the strategy used by the ULLYSES DDT program. All objects are bright enough in the optical that 1 orbit of STIS G430L observation will give good S/N in these spectra. The non-accretors are expected to be fainter in the FUV emission lines, and because they are also fainter in the NUV, the target acquisition exosures for these need to be longer. As a result, the accreting brown dwarfs have 2 COS orbits each while the non-accreting stars have 3 COS orbits each. Bright Object Protection Checks: Half of our sample are expected to be accreting brown dwarfs. For these objects, we downloaded the ULLYSES spectrum of the accreting brown dwarf RECX-16 from program 16480. This object is an M6 star. We used its spectrum, scaling by the G magnitudes of the target stars relative to RECX-16 and accounting for reddening using values in Esplin and Luhman (2019, AJ, 158, 54). We used this for our baseline ETC calculations. For a BOP check, we then repeated the ETC calculations with this template spectrum multiplied by a factor of 4 as done in 16480. These checks did not result in any count rate warnings. For our non-accreting stars, we performed baseline ETC calculations using the Phoenix M dwarf models in the ETC, picking the one closest in effective temperature to our targets and using reddenning values from Esplin and Luhman (2019). To these we added a C IV line doublet using the peak observed C IV flux from very late type dwarfs in Hawley and Johns-Krull (2003, ApJ, 588, L109). This peak line flux value was scaled by distance to the sources as well as the 17700( 11) - 28-Apr-2026 19:41:16 - [ 3] surface area of the objects. For BOP calculations for the non-accretors, we then used the appropriately scaled RECX-16 spectrum as above which contains substantially more UV flux than these baseline calculations as a worst case scenario in case they actually do have some level of accretion. These ETC runs did not yield any count rate warnings. These BOP ETC runs are given in the comments for each observation exposure in the visits. We then followed ISR COS 2017-01(v3) to perform BOP flare checks as follows. For ACQ Imaging: Using the 9000 K blackbody in the ETC, no warnings occur as long as the U magnitude is fainter than 15.7. Using the ISR methodology, we estimate quiescent U magntiudes for our stars from 19.65 to 23.10. They are all M6 or later in spectral type, so the P=10^-4 delta_U (flare) is -2.8. This means the flare peak U magnitudes range from 16.85 to 20.3. The brightest of these is 16.85, and the ETC run for this is COS.ta.1934125. No warnings result from this. For FUV Spectroscopy: Our observed spectral region contains only C IV and Si IV in terms of concerning lines. Ly-a is outside the spectral region recorded, so we do not consider it. From above, the brightest flare expected produces a peak U magnitude of 16.85. This produces an f_U = 7.66e-16 erg cm^-2 s^-1 using equation (6) of the ISR. This produces f_CIV = 2.59e-14 erg cm^-2 s^-1 from equation (2) and f_SIV = 5.92e-15 erg cm^-2 s^-1 from equation (3) of the ISR. We put these flux values into the ETC assuming FWHM 0.2 Ang and line wavelengths of 1548.2 Ang and 1393.8 Ang for C IV and Si IV respectively as directed by the ISR, along with the U continuum for a 9000 K blackbody at U=16.85. We use an exposure time of 2500 sec which is typical of our longest exposures. The ETC run is COS.sp.1934205 with no warnings. ------------------------------------------------------------------------------------ 17700( 11) - 28-Apr-2026 19:41:16 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J04230 STAR, BROWN DWARF, M RA=04H23M6.0792S +/- 0.0000752", J2000 V = 18.68 +/- 0.2 607+2801194 V-IV, PRE-MAIN SEQUENCE DEC=+28D01'19.55" +/- 0.0000394" STAR Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 6.645774267281523E-4 -0.026321999999999998 0.0077184 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J04242 STAR, BROWN DWARF, M RA=04H24M20.8974S +/- 0.000126", J2000 V = 20.1 +/- 0.2 090+2630511 V-IV, PRE-MAIN SEQUENCE DEC=+26D30'51.06" +/- 0.0000667" STAR Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 7.168628717522304E-4 -0.0272059999360863 0.007787 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J04251 STAR, BROWN DWARF, M RA=04H25M15.5091S +/- J2000 V = 17.72 +/- 0.2 550+2829275 V-IV, PRE-MAIN SEQUENCE 0.0000647", DEC=+28D29'27.54" STAR +/- 0.0000444" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 8.302117971822697E-4 -0.025228 0.0072018 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J04345 STAR, BROWN DWARF, M RA=04H34M59.2331S +/- J2000 V = 16.38 +/- 0.2 923+1733379 V-IV, PRE-MAIN SEQUENCE 0.0000327", DEC=+17D33'38.04" STAR +/- 0.0000196" Reference Frame: ICRS Extended: NO Comments: Object entered by PI from SIMBAD data. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 8.600111015226925E-4 -0.020239999999999998 0.006842 ------------------------------------------------------------------------------------------------------------------------------------ 5 2MASS-J04485 STAR, BROWN DWARF, M RA=04H48M57.4539S +/- J2000 V = 18.12 +/- 0.2 745+2913521 V-IV, PRE-MAIN SEQUENCE 0.0000415", DEC=+29D13'52.04" STAR +/- 0.0000224" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 3.3774249230496283E-4 -0.024143 0.0062841 ------------------------------------------------------------------------------------------------------------------------------------ 17700( 11) - 28-Apr-2026 19:41:16 - [ 5] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 6 PSO-J074.199 STAR, BROWN DWARF, M RA=04H56M47.9808S +/- J2000 V = 18.49 +/- 0.2 9+29.2197 V-IV, PRE-MAIN SEQUENCE 0.0000596", DEC=+29D13'11.41" STAR +/- 0.0000269" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 4.2081392323386205E-4 -0.024583999999999998 0.006115 ------------------------------------------------------------------------------------------------------------------------------------ 7 2MASS-J04064 STAR, BROWN DWARF, M RA=04H06M44.4356S +/- J2000 V = 18.65 +/- 0.2 443+2540182 V-IV, PRE-MAIN SEQUENCE 0.0000611", DEC=+25D40'18.24" STAR +/- 0.0000443" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.001035995569375616 -0.018760000000000002 0.0065244 ------------------------------------------------------------------------------------------------------------------------------------ 8 2MASS-J04214 STAR, BROWN DWARF, M RA=04H21M40.1441S +/- J2000 V = 18.01 +/- 0.2 013+2814224 V-IV, PRE-MAIN SEQUENCE 0.0000468", DEC=+28D14'22.56" STAR +/- 0.0000241" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 6.696356156541791E-4 -0.025789000000000003 0.0079782 ------------------------------------------------------------------------------------------------------------------------------------ 17700( 11) - 28-Apr-2026 19:41:16 - [ 6] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 9 2MASS-J04285 STAR, BROWN DWARF, M RA=04H28M50.5436S +/- J2000 V = 17.35 +/- 0.2 053+1844361 V-IV, PRE-MAIN SEQUENCE 0.0000708", DEC=+18D44'36.13" STAR +/- 0.0000413" Reference Frame: ICRS Extended: NO Comments: Object entered by PI from SIMBAD. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 8.811286100799799E-4 -0.018995 0.0067472 ------------------------------------------------------------------------------------------------------------------------------------ 10 2MASS-J04322 STAR, BROWN DWARF, M RA=04H32M23.3108S +/- J2000 V = 19.28 +/- 0.2 329+2403013 V-IV, PRE-MAIN SEQUENCE 0.0000887", DEC=+24D03'1.46" +/- STAR 0.0000585" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 5.243174212203083E-4 -0.021886000058657373 0.0078883 ------------------------------------------------------------------------------------------------------------------------------------ 11 2MASS-J04363 STAR, BROWN DWARF, M RA=04H36M32.4939S +/- J2000 V = 18.58 +/- 0.2 248+2421395 V-IV, PRE-MAIN SEQUENCE 0.0000811", DEC=+24D21'39.66" STAR +/- 0.0000488" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 7.318982439990315E-4 -0.014353999972627207 0.0062997 17700( 11) - 28-Apr-2026 19:41:16 - [ 7] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 12 2MASS-J04554 STAR, BROWN DWARF, M RA=04H55M48.0216S +/- J2000 V = 19.67 +/- 0.2 801+3028050 V-IV, PRE-MAIN SEQUENCE 0.0000949", DEC=+30D28'4.84" +/- STAR 0.0000483" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 3.8047177057257234E-4 -0.023838 0.0062413 ------------------------------------------------------------------------------------------------------------------------------------ 17700( 11) - 28-Apr-2026 19:41:16 - [ 8] Visit: 01 (J0406+2540_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 2 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0406 COS/NUV ACQ/IMA PSA MIRRORA 1 90 S (90 4443+254018 GE S) 2 Comments: COS.ta.1932453 is the nominal TA ETC run. Actual exposure time padded by a factor of 3 in case accretion rate is lower and therefore star is a bit fainter. BOP ETC run is COS.ta.1932940 with spectrum multiplied by 4 and no count rate warnings. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0406 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 1986 S 4443+254018 G (1986 S) 2 Comments: BOP ETC run is COS.sp.1933020 with input spectrum multiplied by 4 and no count rate warnings. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0406 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 4443+254018 G (2592 S) 2 Comments: BOP ETC run is COS.sp.1933022 with input spectrum multiplied by 4 and no count rate warnings. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04064443+254 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 0182 GE 2MASS-J04064443+254 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 0182 G 2MASS-J04064443+254 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 0182 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 9] Visit: 02 (J0406+2540_STIS) Visit Requirements: GROUP 02, 01 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0406 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) 4443+254018 2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0406 STIS/CCD ACCUM 52X2 G430L 4300 1 2100 S 4443+254018 (2100 S) 2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04064443+254 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 0182 2MASS-J04064443+254 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 0182 2MASS-J04064443+254 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 0182 17700( 11) - 28-Apr-2026 19:41:16 - [ 10] Visit: 03 (J0423+2801_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 2 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0423 COS/NUV ACQ/IMA PSA MIRRORA 1 120 S (120 0607+280119 GE S) 4 Comments: COS.ta.1932956 is nominal TA ETC run for S/N ~ 20. Actual exposure padded by a factor of 3 in case accretion is lower and target is noticeably fainter. BOP ETC run is COS.ta.1932957 at the requested 120 sec with the input spectrum multiplied by 4. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0423 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 1926 S 0607+280119 G (1926 S) 4 Comments: BOP ETC run is COS.sp.1933016 with input spectrum multiplied by 4 and no count rate warnings. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0423 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 0607+280119 G (2592 S) 4 Comments: BOP ETC run is COS.sp.1933018 with input spectrum multiplied by 4 and no count rate warnings. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04230607+280 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 1194 GE 2MASS-J04230607+280 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 1194 G 2MASS-J04230607+280 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 1194 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 11] Visit: 04 (J0423+2801_STIS) Visit Requirements: GROUP 04, 03 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0423 STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) 0607+280119 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0423 STIS/CCD ACCUM 52X2 G430L 4300 1 2108 S 0607+280119 (2108 S) 4 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04230607+280 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 1194 2MASS-J04230607+280 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 1194 2MASS-J04230607+280 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 1194 17700( 11) - 28-Apr-2026 19:41:16 - [ 12] Visit: 05 (J0424+2630_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 2 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0424 COS/NUV ACQ/IMA PSA MIRRORA 1 300 S (300 2090+263051 GE S) 1 Comments: COS.ta.1932602 in nominal ETC TA run for target. Actual exposure padded by factor of 3 in case accretion rate is lower and target is fainter by appreciable amount. BOP ETC run is COS.ta.1932963 with input spectrum multiplied by 4 and exposure time the full 300 sec. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0424 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 1566 S 2090+263051 G see below 1 (1440 S) Comments: BOP ETC run is COS.sp.1933011 with inpuut spectrum multiplied by 4. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0424 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 2090+263051 G see below 1 (2250 S) Comments: BOP ETC run is COS.sp.1933013 with input spectrum multiplied by 4. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04242090+263 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 0511 GE 2MASS-J04242090+263 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 1440 S 0511 G 2MASS-J04242090+263 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 2250.0 S 0511 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 13] Visit: 06 (J0424+2630_STIS) Visit Requirements: On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0424 STIS/CCD ACQ F28X50LP MIRROR 1 10 S (10 2090+263051 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0424 STIS/CCD ACCUM 52X2 G430L 4300 1 2080 S 2090+263051 see below 1 (1900 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04242090+263 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 0511 2MASS-J04242090+263 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 950 S 0511 2MASS-J04242090+263 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 950 S 0511 17700( 11) - 28-Apr-2026 19:41:16 - [ 14] Visit: 07 (J0428+1844_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 2 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0428 COS/NUV ACQ/IMA PSA MIRRORA 1 45 S (45 5053+184436 GE S) 1 Comments: COS.ta.1932617 is nominal TA ETC run for target. Actual exposure time is padded by a factor of 3 in case accretion rate is lower and target is noticeable fainter. BOP ETC run is COS.ta.1932973 where input spectrum is multiplied by 4 and using full exposure of 45 sec. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0428 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2067 S 5053+184436 G (2067 S) 1 Comments: BOP ETC calculation is COS.sp.1933006 with input spectrum multiplied by 4. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0428 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2583 S 5053+184436 G (2583 S) 1 Comments: BOP ETC run is COS.sp.1933008 with input spectrum multiplied by 4. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04285053+184 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 4361 GE 2MASS-J04285053+184 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 4361 G 2MASS-J04285053+184 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 4361 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 15] Visit: 08 (J0428+1844_STIS) Visit Requirements: GROUP 08, 07 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0428 STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) 5053+184436 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0428 STIS/CCD ACCUM 52X2 G430L 4300 1 2104 S 5053+184436 (2104 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04285053+184 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 4361 2MASS-J04285053+184 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 4361 2MASS-J04285053+184 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 4361 17700( 11) - 28-Apr-2026 19:41:16 - [ 16] Visit: 09 (J0448+2913_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 2 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0448 COS/NUV ACQ/IMA PSA MIRRORA 1 60 S (60 5745+291352 GE S) 1 Comments: COS.ta.1932621 is nominal TA ETC run for target. Actual exposure time is padded by a factor of 3 in case accretion rate is lower and targets is noticeably fainter. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0448 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2046 S 5745+291352 G (2046 S) 1 Comments: BOP ETC run is COS.sp.1933024 with input spectrum multiplied by 4. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0448 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 5745+291352 G (2592 S) 1 Comments: BOP ETC run is COS.sp.1933027 with input spectrum multiplied by 4. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04485745+291 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 3521 GE 2MASS-J04485745+291 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 3521 G 2MASS-J04485745+291 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 3521 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 17] Visit: 10 (J0448+2913_STIS) Visit Requirements: GROUP 10, 09 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0448 STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) 5745+291352 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0448 STIS/CCD ACCUM 52X2 G430L 4300 1 2112 S 5745+291352 (2112 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04485745+291 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 3521 2MASS-J04485745+291 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 3521 2MASS-J04485745+291 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 3521 17700( 11) - 28-Apr-2026 19:41:16 - [ 18] Visit: 11 (J0455+3028_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 2 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0455 COS/NUV ACQ/IMA PSA MIRRORA 1 150 S (150 4801+302805 GE S) 0 Comments: COS.ta.1932633 is nominal TA ETC run for target. Actual exposure time is padded by a factor of 3 in case accretion rate is lower and target is noticeably fainter. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0455 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 1868 S 4801+302805 G (1868 S) 0 Comments: BOP ETC run is COS.sp.1933032 with input spectrum multiplied by 4. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0455 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2594 S 4801+302805 G (2594 S) 0 Comments: BOP ETC run is COS.sp.1933036 with input spectrum multiplied by 4. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04554801+302 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 8050 GE 2MASS-J04554801+302 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 8050 G 2MASS-J04554801+302 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 8050 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 19] Visit: 12 (J0455+3028_STIS) Visit Requirements: GROUP 12, 11 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0455 STIS/CCD ACQ F28X50LP MIRROR 1 6 S (6 S) 4801+302805 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0455 STIS/CCD ACCUM 52X2 G430L 4300 1 2098 S 4801+302805 (2098 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04554801+302 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 8050 2MASS-J04554801+302 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 8050 2MASS-J04554801+302 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 8050 17700( 11) - 28-Apr-2026 19:41:16 - [ 20] Visit: 13 (J0421+2814_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 3 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0421 COS/NUV ACQ/IMA PSA MIRRORA 1 890 S (890 4013+281422 GE S) 4 Comments: Non-accreting star. BOP ETC run is COS.ta.1933558 where scaled accreting star template is used. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0421 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 385 S (385 4013+281422 G S) 4 Comments: Non-accreting star. BOP ETC run is COS.sp.1933600 with scaled accreting template used. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0421 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2592 S 4013+281422 G (2592 S) 4 Comments: Non-accreting star. BPO ETC run is COS.sp.1933602 using scaled accreting star template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J0421 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 4013+281422 G (2592 S) 4 Comments: Non-accreting star. BPO ETC run is COS.sp.1933602 using scaled accreting star template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04214013+281 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 4224 GE 2MASS-J04214013+281 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 4224 G 2MASS-J04214013+281 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 4224 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 21] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04214013+281 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A 4224 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 22] Visit: 14 (J0421+2814_STIS) Visit Requirements: GROUP 14, 13 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit STIS G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0421 STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) 4013+281422 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0421 STIS/CCD ACCUM 52X2 G430L 4300 1 2108 S 4013+281422 (2108 S) 4 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04214013+281 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 4224 2MASS-J04214013+281 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 4224 2MASS-J04214013+281 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 4224 17700( 11) - 28-Apr-2026 19:41:16 - [ 23] Visit: 15 (J0425+2829_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 3 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0425 COS/NUV ACQ/IMA PSA MIRRORA 1 470 S (470 1550+282927 GE S) 5 Comments: Non-accreting star. BOP ETC run is COS.ta.1933597 where spectrum of scaled accreting star is input. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0425 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=2 1 1226 S 1550+282927 G (1226 S) 5 Comments: Non-accreting star. BOP ETC run is COS.sp.1933613 qhwew scaled spectrum of accreting template is used. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0425 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2592 S 1550+282927 G (2592 S) 5 Comments: Non-accreting star. BOP ETC run is COS.sp.1933614 where scaled spectrum of accreting template is used. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J0425 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 1550+282927 G (2592 S) 5 Comments: Non-accreting star. BOP ETC run is COS.sp.1933614 where scaled spectrum of accreting template is used. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04251550+282 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 9275 GE 2MASS-J04251550+282 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 9275 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 24] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04251550+282 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 9275 G 2MASS-J04251550+282 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A 9275 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 25] Visit: 16 (J0425+2829_STIS) Visit Requirements: GROUP 16, 15 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0425 STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) 1550+282927 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0425 STIS/CCD ACCUM 52X2 G430L 4300 1 2112 S 1550+282927 (2112 S) 5 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04251550+282 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 9275 2MASS-J04251550+282 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 9275 2MASS-J04251550+282 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 9275 17700( 11) - 28-Apr-2026 19:41:16 - [ 26] Visit: 17 (J0432+2403_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 3 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0432 COS/NUV ACQ/IMA PSA MIRRORA 1 1150 S GS ACQ SCENARIO BASE1ON3 2329+240301 GE (1150 S) 3 Comments: Non-accreting star. BOP ETC run is COS.ta.1933632 where scaled accreting template is used. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0432 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2588 S 2329+240301 G see below 3 (2300 S) Comments: Non-accreting star. BOP ETC run is COS.sp.1933637 using scaled template of an accreting star. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0432 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2588 S 2329+240301 G see below 3 (2300 S) Comments: Non-accreting star. BOP ETC run is COS.sp.1933637 using scaled template of an accreting star. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04322329+240 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 3013 GE 2MASS-J04322329+240 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 2300.0 S 3013 G 2MASS-J04322329+240 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 2300.0 S 3013 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 27] Visit: 18 (J0432+2403_STIS) Visit Requirements: GROUP 18, 17 WITHIN 2D On Hold Comments: Additional Comments: This is the 1 orbit G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0432 STIS/CCD ACQ F28X50LP MIRROR 1 4 S (4 S) 2329+240301 3 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0432 STIS/CCD ACCUM 52X2 G430L 4300 1 2100 S 2329+240301 see below 3 (1900 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04322329+240 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 3013 2MASS-J04322329+240 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 950 S 3013 2MASS-J04322329+240 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 950 S 3013 17700( 11) - 28-Apr-2026 19:41:16 - [ 28] Visit: 19 (J0436+2421_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 3 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0436 COS/NUV ACQ/IMA PSA MIRRORA 1 1270 S 3248+242139 GE (1270 S) 5 Comments: Non-accreting star. BOP ETC run is COS.ta.1933655 using a scaled accreting template spectrum. No count rate warings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0436 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2588 S 3248+242139 G (2588 S) 5 Comments: Non-accreting star. BOP ETC run is COS.sp.1933669 using a scaled accreting template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0436 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2588 S 3248+242139 G (2588 S) 5 Comments: Non-accreting star. BOP ETC run is COS.sp.1933669 using a scaled accreting template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04363248+242 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 1395 GE 2MASS-J04363248+242 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 1395 G 2MASS-J04363248+242 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A 1395 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 29] Visit: 20 (J0436+2421_STIS) Visit Requirements: GROUP 20, 19 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0436 STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) 3248+242139 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0436 STIS/CCD ACCUM 52X2 G430L 4300 1 2108 S 3248+242139 (2108 S) 5 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04363248+242 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 1395 2MASS-J04363248+242 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 1395 2MASS-J04363248+242 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 1395 17700( 11) - 28-Apr-2026 19:41:16 - [ 30] Visit: 21 (J0456+2913_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 3 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSO-J074.19 COS/NUV ACQ/IMA PSA MIRRORA 1 1270 S 99+29.2197 GE (1270 S) Comments: Non-accreting star. BOP ETC run is COS.ta.1933700 using scaled accreting star template. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 PSO-J074.19 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2592 S 99+29.2197 G (2592 S) Comments: Non-accreting star. BOP ETC run is COS.sp.1933704 using scaled spectrum of accreting template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 PSO-J074.19 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2592 S 99+29.2197 G (2592 S) Comments: Non-accreting star. BOP ETC run is COS.sp.1933704 using scaled spectrum of accreting template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSO-J074.1999+29.21 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 97 GE PSO-J074.1999+29.21 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 97 G PSO-J074.1999+29.21 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A 97 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 31] Visit: 22 (J0456+2913_STIS) Visit Requirements: GROUP 22, 21 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PSO-J074.19 STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) 99+29.2197 ------------------------------------------------------------------------------------------------------------------------------------ 2 PSO-J074.19 STIS/CCD ACCUM 52X2 G430L 4300 1 2108 S 99+29.2197 (2108 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ PSO-J074.1999+29.21 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 97 PSO-J074.1999+29.21 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 97 PSO-J074.1999+29.21 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 97 17700( 11) - 28-Apr-2026 19:41:16 - [ 32] Visit: 23 (J0434+1733_COS) Visit Requirements: On Hold Comments: Additional Comments: This is the COS observation for 3 orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0434 COS/NUV ACQ/IMA PSA MIRRORA 1 375 S (375 5923+173337 GE S) 9 Comments: Non-accreting star. BOP ETC run is COS.ta.1933708 using scaled spectrum of accreting star template. No count rate warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0434 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=2 1 1407 S 5923+173337 G (1407 S) 9 Comments: Non-accreting star. BOP ETC run is COS.sp.1933728 using a scaled spectrum of the accreting star template. No warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0434 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=3 1 2583 S 5923+173337 G (2583 S) 9 Comments: Non-accreting star. BOP ETC run is COS.sp.1933731 using scaled spectrum of accreting star template. Now warnings result. ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J0434 COS/FUV TIME-TA PSA G160M 1533 BUFFER-TIME=6000, FP-POS=4 1 2583 S 5923+173337 G (2583 S) 9 Comments: Non-accreting star. BOP ETC run is COS.sp.1933731 using scaled spectrum of accreting star template. Now warnings result. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04345923+173 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 3379 GE 2MASS-J04345923+173 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A 3379 G 2MASS-J04345923+173 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A 3379 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 33] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04345923+173 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A 3379 G 17700( 11) - 28-Apr-2026 19:41:16 - [ 34] Visit: 24 (J0434+1733_STIS) Visit Requirements: GROUP 24, 23 WITHIN 1D On Hold Comments: Additional Comments: This is the 1 orbit G430L observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J0434 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 5923+173337 9 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0434 STIS/CCD ACCUM 52X2 G430L 4300 1 2108 S 5923+173337 (2108 S) 9 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J04345923+173 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A 3379 2MASS-J04345923+173 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A 3379 2MASS-J04345923+173 2 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A 3379 17700( 11) - 28-Apr-2026 19:41:16 - [ 35] Summary Form for Proposal 17700 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X2, F28X50LP, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=6000, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 02, 01 WITHIN 1D, GROUP 04, 03 WITHIN 1D, GROUP 08, 07 WITHIN 1D, GROUP 10, 09 WITHIN 1D, GROUP 12, 11 WITHIN 1D, GROUP 14, 13 WITHIN 1D, GROUP 16, 15 WITHIN 1D, GROUP 18, 17 WITHIN 2D, GROUP 20, 19 WITHIN 1D, GROUP 22, 21 WITHIN 1D, GROUP 24, 23 WITHIN 1D, GS ACQ SCENARIO BASE1ON3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G160M, G430L, MIRROR, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASS-J04064443+2540182, 2MASS-J04214013+2814224, 2MASS-J04230607+2801194, 2MASS-J04242090+2630511, 2MASS-J04251550+2829275, 2MASS-J04285053+1844361, 2MASS-J04322329+2403013, 2MASS-J04345923+1733379, 2MASS-J04363248+2421395, 2MASS-J04485745+2913521, 2MASS-J04554801+3028050, PSO-J074.1999+29.2197 ------------------------------------------------------------------------------------------------------------------------------------