18370( 3) - 10-Aug-2026 12:32:34 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18370 Version: 3 Check-in Time: 10-Aug-2026 12:32:34 STScI Edit Number: 1 Title Rockin' photospheres: how White Dwarf stars respond to heavy metal accretion ------------------------------------------------------------------------------------ Type Cycle GO 34 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ravi Sankrit Space Telescope Science Institute Y CoI: Dr. Tim Cunningham Harvard University N CoI: Dr. John Henry Debes Space Telescope Science Institute - ESA - N JWST CoI: Dr. Susana E. Deustua National Institute of Standards and N Technology CoI: Dr. Patrick Dufour Universite de Montreal N CoI: Dr. Jay B. Holberg University of Arizona N CoI: Erika Le Bourdais Universite de Montreal N CoI: Dr. Siyi Xu NOIRLab - Gemini North (HI) N ------------------------------------------------------------------------------------ Abstract Metal-polluted WDs are important laboratories for studying the composition of exoplanets and the evolution of the planetary systems, where these metals originated. The far-UV wavelength range is crucial for these studies, as they host a large number of metal-line transitions that provide subtle diagnostics of the WD photospheric properties, yet only a handful have been observed at wavelengths below 1140 Angstroms. We propose to use the Cosmic Origins Spectrograph to observe five metal-line WDs with a wide range of inferred accretion rates using the G130M/1055 mode, which spans the Lyman Ultraviolet (~912 to 1200 A) and includes lines from several elements including N, P, S and Si. We will also observe a comparison set of four pristine WDs, which will allow us to accurately flux-calibrate our entire sample and investigate how the photospheres of WDs with Teff~20, 000 K behave under different accretion conditions. ------------------------------------------------------------------------------------ Observations Description ------------------------ All targets will be acquired using NUV ACQ/IM using the BOA. MIRROR A will be used for all targets except WD 1134+300 (GD 140, Target 6, Visit 06), which will use MIRROR B. The exposure times have been rounded up slightly to ensure the acquisitions are successful ------------------- The science exposure will use G130M/1055 at the default lifetime position, LP7. The ETC numbers reported are those using synthetic models and specifying S/N=10 at 1085A. Note that the S/N changes sharply around this wavelength for all 18370( 3) - 10-Aug-2026 12:32:34 - [ 2] targets because of the throughput cliff at 1150A as well as their intrinsic spectra. The spectral region of interest extends down to the Lyman limit (for WD models), and to approximately 1050A for observing the photospheric metal lines. Therefore the exposure times from the ETC runs are minimum required values. (They provide the correct buffer fill times and the correct brightest pixel rates.) For most of the target we have chosen exposure times that are within the orbit allocation, but do not fill the orbits. The exceptions are for the faintest targets/visits 04 and 07 where we have used the auto-adjust feature to maximize exposure times. ------------------- We note that the orbit request in the Phase I proposal used v33.1 of the exposure time calculator. The new synphot files along with the expected time-dependent sensitivity trend used in v34.2 have resulted in moderate increases in the exposure times, but more importantly in significant decreases in the brightest pixel count-rates. Our Phase I proposal reported a COS lifetime impact measure of 153 counts based on those minimum required exposure times. Our actual exposure times used in the Phase II yield a slightly lower impact measure of 144 counts. ------------------------------------------------------------------------------------ 18370( 3) - 10-Aug-2026 12:32:34 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WD0106-358 STAR, DA, DZ RA=01H08M20.7693S +/- 0.1", J2000 V = 14.72 DEC=-35D34'41.70" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_24: target information verified RS 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 -0.003160701017439358 -0.052062 0.0106896 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD2149+021 STAR, DA RA=21H52M25.3790S +/- 0.1", J2000 V = 12.743 DEC=+02D23'19.58" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 0.0010224218005591892 -0.300533 0.0443255 ------------------------------------------------------------------------------------------------------------------------------------ 18370( 3) - 10-Aug-2026 12:32:34 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 3 WD1337+705 STAR, DA, DZ RA=13H38M50.4781S +/- 0.1", J2000 V = 12.6 DEC=+70D17'7.64" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 -0.07946203976939076 -0.024556 0.0377291 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD1822+410 STAR, DA, DB, DZ RA=18H23M37.0115S +/- 0.1", J2000 V = 14.288 DEC=+41D04'2.11" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 4.695340136522969E-5 0.13834 0.0229244 ------------------------------------------------------------------------------------------------------------------------------------ 18370( 3) - 10-Aug-2026 12:32:34 - [ 5] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 5 WD0420+520 STAR, DA, DZ RA=04H24M15.7372S +/- 0.1", J2000 V = 15.01 DEC=+52D10'10.64" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 -0.0038806991965221523 -0.008102 0.0136905 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD1134+300 STAR, DA RA=11H37M5.1041S +/- 0.1", J2000 V = 12.45 DEC=+29D47'58.29" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 -0.011348173872138694 -0.012532999999999999 0.0637329 ------------------------------------------------------------------------------------------------------------------------------------ 18370( 3) - 10-Aug-2026 12:32:34 - [ 6] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 7 WD1511+009 STAR, DA RA=15H14M21.2728S +/- 0.1", J2000 V = 16.5 DEC=+00D47'52.81" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 2.900281298001913E-4 -0.026855 0.0064451 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD1052+273 STAR, DA RA=10H54M43.3168S +/- 0.1", J2000 V = 14.22 DEC=+27D06'57.04" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 -0.010880886431883048 -0.033739 0.0264867 ------------------------------------------------------------------------------------------------------------------------------------ 18370( 3) - 10-Aug-2026 12:32:34 - [ 7] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 9 WD0308-565 STAR, DB RA=03H09M47.9178S +/- 0.1", J2000 V = 14.14 DEC=-56D23'49.41" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: 2026_Jul_27: target information verified RS 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 0.0179799718135095 0.066806 0.0201813 ------------------------------------------------------------------------------------------------------------------------------------ 18370( 3) - 10-Aug-2026 12:32:34 - [ 8] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: 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 WD0106-358 COS/NUV ACQ/IMA BOA MIRRORA 1 15 S (15 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0106-358 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 400 S G BUFFER-TIME=400 (1600 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0106-358 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD0106-358 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD0106-358 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD0106-358 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 2 N/A G WD0106-358 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 2 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 9] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: 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 WD2149+021 COS/NUV ACQ/IMA BOA MIRRORA 1 10 S (10 GS ACQ SCENARIO BASE1OR GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD2149+021 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 140 S (560 G BUFFER-TIME=140 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD2149+021 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD2149+021 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD2149+021 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD2149+021 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 1 N/A G WD2149+021 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 1 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 10] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: 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 WD1337+705 COS/NUV ACQ/IMA BOA MIRRORA 1 10 S (10 GS ACQ SCENARIO BASE1OR GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1337+705 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 160 S (640 G BUFFER-TIME=160 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1337+705 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD1337+705 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD1337+705 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD1337+705 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 1 N/A G WD1337+705 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 1 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 11] Visit: 04 Visit Requirements: On Hold Comments: Additional Comments: 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 WD1822+410 COS/NUV ACQ/IMA BOA MIRRORA 1 30 S (30 GS ACQ SCENARIO BASE1OR GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1822+410 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 950 S G BUFFER-TIME=840 see below (6390 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1822+410 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD1822+410 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 1929.0 S G WD1822+410 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 2 N/A G WD1822+410 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 2 N/A G WD1822+410 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 3 2561.0 S G 18370( 3) - 10-Aug-2026 12:32:34 - [ 12] Visit: 05 Visit Requirements: On Hold Comments: Additional Comments: 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 WD0420+520 COS/NUV ACQ/IMA BOA MIRRORA 1 30 S (30 GS ACQ SCENARIO BASE1OR GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0420+520 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 600 S G BUFFER-TIME=490 (2400 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0420+520 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD0420+520 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD0420+520 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD0420+520 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 2 N/A G WD0420+520 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 2 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 13] Visit: 06 Visit Requirements: On Hold Comments: Additional Comments: 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 WD1134+300 COS/NUV ACQ/IMA BOA MIRRORB 1 35 S (35 GS ACQ SCENARIO BASE1OR GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1134+300 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 120 S (480 G BUFFER-TIME=120 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1134+300 1 COS/NUV ACQ/IMA BOA MIRRORB none none none none 1 N/A GE WD1134+300 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD1134+300 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD1134+300 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 1 N/A G WD1134+300 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 1 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 14] Visit: 07 Visit Requirements: On Hold Comments: Additional Comments: 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 WD1511+009 COS/NUV ACQ/IMA BOA MIRRORA 1 40 S (40 GS ACQ SCENARIO BASE1OR GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1511+009 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 600 S G BUFFER-TIME=490 see below (3046 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1511+009 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD1511+009 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 613.0 S G WD1511+009 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 613.0 S G WD1511+009 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 2 910.0 S G WD1511+009 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 2 910.0 S G 18370( 3) - 10-Aug-2026 12:32:34 - [ 15] Visit: 08 Visit Requirements: On Hold Comments: Additional Comments: 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 WD1052+273 COS/NUV ACQ/IMA BOA MIRRORA 1 15 S (15 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD1052+273 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 400 S G BUFFER-TIME=400 (1600 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD1052+273 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD1052+273 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD1052+273 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD1052+273 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 2 N/A G WD1052+273 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 2 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 16] Visit: 09 Visit Requirements: On Hold Comments: Additional Comments: 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 WD0308-565 COS/NUV ACQ/IMA BOA MIRRORA 1 15 S (15 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0308-565 COS/FUV TIME-TA PSA G130M 1055 LIFETIME-POS=LP7, FP-POS=ALL, 1 600 S G BUFFER-TIME=600 (2400 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0308-565 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE WD0308-565 2 COS/FUV TIME-TA PSA G130M 1055 none none none 1 1 N/A G WD0308-565 2 COS/FUV TIME-TA PSA G130M 1055 none none none 2 1 N/A G WD0308-565 2 COS/FUV TIME-TA PSA G130M 1055 none none none 3 2 N/A G WD0308-565 2 COS/FUV TIME-TA PSA G130M 1055 none none none 4 2 N/A G 18370( 3) - 10-Aug-2026 12:32:34 - [ 17] Summary Form for Proposal 18370 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=120, BUFFER-TIME=140, BUFFER-TIME=160, BUFFER-TIME=400, BUFFER-TIME=490, BUFFER-TIME=600, BUFFER-TIME=840, FP-POS=ALL, LIFETIME-POS=LP7 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1OR ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORA, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names WD0106-358, WD0308-565, WD0420+520, WD1052+273, WD1134+300, WD1337+705, WD1511+009, WD1822+410, WD2149+021 ------------------------------------------------------------------------------------------------------------------------------------