17733( 5) - 10-Dec-2025 11:35:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17733 Version: 5 Check-in Time: 10-Dec-2025 11:35:06 STScI Edit Number: 2 Title When Clouds Collide: Observing Gas Accretion onto the Milky Way's Disk ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Yong Zheng Rensselaer Polytechnic Institute Y CoI: Dr. Jessica Kay Werk University of Washington N CoI: Dr. Hannah V. Bish Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Despite it being the reference L* galaxy for extragalactic studies, our Milky Way (MW) seems to host a circumgalactic medium (CGM) with far less ionized gas content than their low-redshift counterparts. This program is designed to investigate the MW's CGM anomaly by examining whether there are large streams of ionized gas being accreted onto the MW's disk in a co-planner manner at low Galactic latitudes, which may elude previous studies that were limited to QSOs at high-latitude regions. We will observe 4 new QSO sightlines toward the anti-Galactic center direction, where a large population of infalling HI clouds are present. We will quantify the physical properties of the ionized gas associated with the infalling HI clouds, including ionization states, ion ratios, metallicity, neutral and ionized masses, and infalling time scales and mass rates. Detections of high ion column densities in our proposed observations will confirm that there are indeed large streams of ionized gas flowing from the MW's CGM to the disk, resolving the debate surrounding the MW's CGM anomaly. Null detection of ionized gas would also be extremely informative: it would indicate that the MW's CGM is truly different from those of other L* galaxies, with insufficient amounts of ionized gas in all directions. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe the QSOs using both G130M and G160M gratings to cover a wide range of UV ions, such as SiII, SII, AlII, CII, and CIV. The observations are split into 2-3 orbits per visit. Observation setup strategy: - Gratings and CENWAVE: we will use both G130M and G160M gratings for our observations. For G130M, we will use CENWAVE=1291 (SEGMENT=BOTH, FP-POS=3, 4) to cover our targeted ion lines. For G160M, we will use CENWAVE=1589 and FP-POS=1, 2, 3, 4. - Target acquisition: our targets have coordiante uncertainties within 0.03-0.05 arcsec based on SIMBAD (except QSO 2: UVQS-J070919.25+254923.4 which has no reported uncertainties and we assume an uncertainty of 0.05 arcsec). All targets are at z>0.1 and appear to be point sources in 2MASS images, so we conduct target acquisition using ACQ/IMAGE in NUV, with sufficient exposure times to reach S/N=20 using an FOS-based template spectrum. 17733( 5) - 10-Dec-2025 11:35:06 - [ 2] - Science exposure: for exposure time, we modeled the QSOs with COS-based QSO input spectra, adding in the appropriate extinction, and normalizing the spectra to each QSO's GALEX FUV AB magnitude. We aim to achieve a signal-to-noise ratio S/N=12 at 1300 A for G130M and 1550 A for G160M. The observations will be conducted in TIME-TAG mode. The Buffer Fill Time from COS ETC is generally long (a few thousands seccond), and we set the Buffer Time to equal to the exposure time following the flow chart in Figure 5.12 in COS instrument handbook. ------------------------------------------------------------------------------------ 17733( 5) - 10-Dec-2025 11:35:06 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J07380 GALAXY, QSO, QUASAR RA=07H38M7.0324S +/- 0.0513", J2000 Z = 0.75 V = 16.4 FUV=17.38 702+2127295 DEC=+21D27'29.54" +/- 0.0431 " 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 6.088707464367992E-6 1.1E-5 4.07E-5 ------------------------------------------------------------------------------------------------------------------------------------ 2 UVQS-J070919 GALAXY, QSO, QUASAR RA=07H09M19.2500S +/- 0.05", J2000 Z = V = 16.4 FUV=17.30 .25+254923.4 DEC=+25D49'23.40" +/- 0.05" 0.136 Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. No coordinate uncertainties in RA or DEC from SIMBAD. So we assumed an uncertaity of 0.05 arcsec in both RA and DEC, which is based on the coordinate uncertainties of other targets on our list. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J06413 GALAXY, QSO, QUASAR RA=06H41M39.3727S +/- 0.0449 ", J2000 Z = V = 16.4 FUV=17.56 937+4510020 DEC=+45D10'2.03" +/- 0.0484" 0.297 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 4.727864657641673E-6 -2.5000008463393897E-5 1.96E-5 ------------------------------------------------------------------------------------------------------------------------------------ 17733( 5) - 10-Dec-2025 11:35:06 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 VV2000-J0426 GALAXY, QSO, QUASAR RA=04H26M30.0943S +/- 0.0398 ", J2000 Z = 0.17 V = 16.4 FUV=17.42 30.1+070530 DEC=+07D05'30.06" +/- 0.0284" 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 1.5451539642185706E-6 2.9999999999999997E-5 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17733( 5) - 10-Dec-2025 11:35:06 - [ 5] Visit: 01 (Q1-G130M-a3) Visit Requirements: On Hold Comments: Additional Comments: Observation for 2MASS-J07380702+2127295 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-J0738 COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 0702+212729 GE S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0738 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2315 S 0702+212729 G BUFFER-TIME=2315 (2315 S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0738 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2584, 1 2584 S 0702+212729 G SEGMENT=BOTH, FP-POS=3 (2584 S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J0738 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2584 S 0702+212729 G BUFFER-TIME=2584 (2584 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-J07380702+212 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 7295 GE 2MASS-J07380702+212 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 7295 G 2MASS-J07380702+212 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 7295 G 2MASS-J07380702+212 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A 7295 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 6] Visit: 02 (Q1-G160M-a2) Visit Requirements: On Hold Comments: Additional Comments: Observation for 2MASS-J07380702+2127295 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-J0738 COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 0702+212729 GE S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0738 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=1, 1 2157 S 0702+212729 G BUFFER-TIME=2157 (2157 S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0738 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=2, 1 2588 S 0702+212729 G BUFFER-TIME=2588 (2588 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-J07380702+212 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 7295 GE 2MASS-J07380702+212 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 7295 G 2MASS-J07380702+212 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 7295 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 7] Visit: 03 (Q1-G160M-b2) Visit Requirements: On Hold Comments: Additional Comments: Observation for 2MASS-J07380702+2127295 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-J0738 COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 0702+212729 GE S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0738 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=3, 1 2157 S 0702+212729 G BUFFER-TIME=2157 (2157 S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0738 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=4, 1 2588 S 0702+212729 G BUFFER-TIME=2588 (2588 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-J07380702+212 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 7295 GE 2MASS-J07380702+212 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 7295 G 2MASS-J07380702+212 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 7295 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 8] Visit: 04 (Q2-G130M-a3) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q2: UVQS-J070919.25+254923.4 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 UVQS-J07091 COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 9.25+254923 GE S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 2 UVQS-J07091 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2319 S 9.25+254923 G BUFFER-TIME=2319 (2319 S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 3 UVQS-J07091 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2588, 1 2588 S 9.25+254923 G SEGMENT=BOTH, FP-POS=3 (2588 S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 4 UVQS-J07091 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2588 S 9.25+254923 G BUFFER-TIME=2588 (2588 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 | ------------------------------------------------------------------------------------------------------------------------------------ UVQS-J070919.25+254 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 923.4 GE UVQS-J070919.25+254 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 923.4 G UVQS-J070919.25+254 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 923.4 G UVQS-J070919.25+254 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A 923.4 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 9] Visit: 05 (Q2-G160M-a2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q2: UVQS-J070919.25+254923.4 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 UVQS-J07091 COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 9.25+254923 GE S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 2 UVQS-J07091 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=1, 1 2161 S 9.25+254923 G BUFFER-TIME=2161 (2161 S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 3 UVQS-J07091 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=2, 1 2592 S 9.25+254923 G BUFFER-TIME=2592 (2592 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 | ------------------------------------------------------------------------------------------------------------------------------------ UVQS-J070919.25+254 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 923.4 GE UVQS-J070919.25+254 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 923.4 G UVQS-J070919.25+254 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 923.4 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 10] Visit: 06 (Q2-G160M-a2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q2: UVQS-J070919.25+254923.4 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 UVQS-J07091 COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 9.25+254923 GE S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 2 UVQS-J07091 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=3, 1 2161 S 9.25+254923 G BUFFER-TIME=2161 (2161 S) .4 ------------------------------------------------------------------------------------------------------------------------------------ 3 UVQS-J07091 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=4, 1 2592 S 9.25+254923 G BUFFER-TIME=2592 (2592 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 | ------------------------------------------------------------------------------------------------------------------------------------ UVQS-J070919.25+254 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 923.4 GE UVQS-J070919.25+254 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 923.4 G UVQS-J070919.25+254 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 923.4 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 11] Visit: 07 (Q3-G130M-a2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q3: 2MASS-J06413937+4510020 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-J0641 COS/NUV ACQ/IMA PSA MIRRORB 1 13 S (13 3937+451002 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0641 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2343 S 3937+451002 G BUFFER-TIME=2343 (2343 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0641 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2618, 1 2618 S 3937+451002 G SEGMENT=BOTH, FP-POS=3 (2618 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-J06413937+451 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0020 GE 2MASS-J06413937+451 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 0020 G 2MASS-J06413937+451 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 0020 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 12] Visit: 08 (Q3-G160M-a3) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q3: 2MASS-J06413937+4510020 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-J0641 COS/NUV ACQ/IMA PSA MIRRORB 1 13 S (13 3937+451002 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0641 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=1, 1 2185 S 3937+451002 G BUFFER-TIME=2185 (2185 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0641 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=2, 1 2622 S 3937+451002 G BUFFER-TIME=2622 (2622 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J0641 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=3, 1 2622 S 3937+451002 G BUFFER-TIME=2622 (2622 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-J06413937+451 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0020 GE 2MASS-J06413937+451 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 0020 G 2MASS-J06413937+451 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 0020 G 2MASS-J06413937+451 4 COS/FUV TIME-TA PSA G160M 1589 none none none none 3 N/A 0020 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 13] Visit: 10 (Q3-G130M-b2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q3: 2MASS-J06413937+4510020 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-J0641 COS/NUV ACQ/IMA PSA MIRRORB 1 13 S (13 3937+451002 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J0641 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2343 S 3937+451002 G BUFFER-TIME=2343 (2343 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J0641 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2618, 1 2618 S 3937+451002 G SEGMENT=BOTH, FP-POS=4 (2618 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-J06413937+451 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0020 GE 2MASS-J06413937+451 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 0020 G 2MASS-J06413937+451 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 0020 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 14] Visit: 11 (Q4-G130M-a2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q4: VV2000-J042630.1+070530 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 VV2000-J042 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S (16 630.1+07053 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 VV2000-J042 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2285 S 630.1+07053 G BUFFER-TIME=2285 (2285 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 VV2000-J042 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2566, 1 2566 S 630.1+07053 G SEGMENT=BOTH, FP-POS=3 (2566 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 | ------------------------------------------------------------------------------------------------------------------------------------ VV2000-J042630.1+07 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0530 GE VV2000-J042630.1+07 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 0530 G VV2000-J042630.1+07 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 0530 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 15] Visit: 12 (Q4-G130M-b2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q4: VV2000-J042630.1+070530 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 VV2000-J042 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S (16 630.1+07053 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 VV2000-J042 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2285 S 630.1+07053 G BUFFER-TIME=2285 (2285 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 VV2000-J042 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2566, 1 2566 S 630.1+07053 G SEGMENT=BOTH, FP-POS=4 (2566 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 | ------------------------------------------------------------------------------------------------------------------------------------ VV2000-J042630.1+07 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0530 GE VV2000-J042630.1+07 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 0530 G VV2000-J042630.1+07 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 0530 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 16] Visit: 13 (Q4-G160M-a3) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q4: VV2000-J042630.1+070530 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 VV2000-J042 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S (16 630.1+07053 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=1, 1 2127 S 630.1+07053 G BUFFER-TIME=2127 (2127 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=2, 1 2570 S 630.1+07053 G BUFFER-TIME=2570 (2570 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 4 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=3, 1 2570 S 630.1+07053 G BUFFER-TIME=2570 (2570 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 | ------------------------------------------------------------------------------------------------------------------------------------ VV2000-J042630.1+07 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0530 GE VV2000-J042630.1+07 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 0530 G VV2000-J042630.1+07 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 0530 G VV2000-J042630.1+07 4 COS/FUV TIME-TA PSA G160M 1589 none none none none 3 N/A 0530 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 17] Visit: 14 (Q4-G160M-b2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q4: VV2000-J042630.1+070530 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 VV2000-J042 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S (16 630.1+07053 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=4, 1 2127 S 630.1+07053 G BUFFER-TIME=2127 (2127 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=4, 1 2570 S 630.1+07053 G BUFFER-TIME=2570 (2570 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 | ------------------------------------------------------------------------------------------------------------------------------------ VV2000-J042630.1+07 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0530 GE VV2000-J042630.1+07 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 0530 G VV2000-J042630.1+07 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 0530 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 18] Visit: 15 (Q4-G130M-b2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q4: VV2000-J042630.1+070530 HOPR repeat of visit 12. 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 VV2000-J042 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S (16 630.1+07053 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 VV2000-J042 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2285 S 630.1+07053 G BUFFER-TIME=2285 (2285 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 VV2000-J042 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2566, 1 2566 S 630.1+07053 G SEGMENT=BOTH, FP-POS=4 (2566 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 | ------------------------------------------------------------------------------------------------------------------------------------ VV2000-J042630.1+07 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0530 GE VV2000-J042630.1+07 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A 0530 G VV2000-J042630.1+07 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A 0530 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 19] Visit: 16 (Q4-G160M-b2) Visit Requirements: On Hold Comments: Additional Comments: Observation for Q4: VV2000-J042630.1+070530 HOPR repeat of visit 14. 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 VV2000-J042 COS/NUV ACQ/IMA PSA MIRRORB 1 16 S (16 630.1+07053 GE S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=4, 1 2127 S 630.1+07053 G BUFFER-TIME=2127 (2127 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 VV2000-J042 COS/FUV TIME-TA PSA G160M 1589 SEGMENT=BOTH, FP-POS=4, 1 2570 S 630.1+07053 G BUFFER-TIME=2570 (2570 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 | ------------------------------------------------------------------------------------------------------------------------------------ VV2000-J042630.1+07 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0530 GE VV2000-J042630.1+07 2 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A 0530 G VV2000-J042630.1+07 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 2 N/A 0530 G 17733( 5) - 10-Dec-2025 11:35:06 - [ 20] Summary Form for Proposal 17733 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=2127, BUFFER-TIME=2157, BUFFER-TIME=2161, BUFFER-TIME=2185, BUFFER-TIME=2285, BUFFER-TIME=2315, BUFFER-TIME=2319, BUFFER-TIME=2343, BUFFER-TIME=2566, BUFFER-TIME=2570, BUFFER-TIME=2584, BUFFER-TIME=2588, BUFFER-TIME=2592, BUFFER-TIME=2618, BUFFER-TIME=2622, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASS-J06413937+4510020, 2MASS-J07380702+2127295, UVQS-J070919.25+254923.4, VV2000-J042630.1+070530 ------------------------------------------------------------------------------------------------------------------------------------