17824( 6) - 30-Mar-2026 17:18:55 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17824 Version: 6 Check-in Time: 30-Mar-2026 17:18:55 STScI Edit Number: 3 Title Examining the metal diverse interior composition of thick disk and halo planets using polluted white dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Jamie Williams University of Warwick Y CoI: Dr. Thomas G. Wilson University of Warwick N CoI: Prof. Boris T. Gaensicke University of Warwick N ------------------------------------------------------------------------------------ Abstract Exoplanets are incredibly diverse objects and many are unlike anything we have in the Solar System, including hot-Jupiters, super-Earths and sub-Neptunes. The formation of these bodies depends on material available in the proto-planetary disk. Compositionally-different stars can therefore give rise to compositionally-different exoplanets. Thick disk and halo stars are metal-poor and alpha-enhanced and initial findings corroborate their exoplanets share the host star composition. However, observations of main sequence stars can only give densities and compositions are inferred using models, leading to large degeneracies. If an object is accreted onto a white dwarf, their pure hydrogen or helium atmospheres becomes polluted. This allows us to directly measure the composition of the accreted body using spectroscopic observations. This method had been incredibly sucessful when applied to thin disk stars and can reveal much more information about the interiors of exoplanets compared to only density, We propose targeting thick disk and halo polluted white dwarfs to investigate the chemical composition of exoplanets orbiting thick disk and halo stars. This study will probe their interiors using a method never applied to thick disk and halo exoplanets. We will be able to uncover the effects that galactic chemical evolution and galactic location have on what kind of exoplanets form. ------------------------------------------------------------------------------------ Observations Description ------------------------ These HST observations will obtain COS/G130M FUV spectroscopy of eight hydrogen-dominated white dwarfs, which are located in the thick disk or halo, revealed by kinematic analysis. We use exposure times such that we aim for S/N = 30 at 1310A, with a central wavelength of 1291A and exposure times split equally across FP-POS 3 and 4. For targets with 4 or more orbits, we also observe with a central wavelength of 1222A with FP-POS 1, 2, 3, 4 for more blue coverage. The ETC simulations are carried out using spectra generated from models for Teff and logg of the white dwarfs from the the Gentile-Fusillo (2021) white 17824( 6) - 30-Mar-2026 17:18:55 - [ 2] dwarf catalogue from Gaia DR3. ------------------------------------------------------------------------------------ 17824( 6) - 30-Mar-2026 17:18:55 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WD-J010852.7 STAR, DA RA=01H08M52.7855S +/- 0.063", J2000 V = 16.49 9+165838.57 DEC=+16D58'38.57" +/- 0.0579" 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. Teff = 26623 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0025012718302846845 -0.023015999909148377 0.0049813999999999995 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J014728.9 STAR, DA RA=01H47M28.9883S +/- 0.1546", J2000 V = 18.02 9+235141.34 DEC=+23D51'41.34" +/- 0.1182" Reference Frame: ICRS Extended: NO Comments: Teff = 20020 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.002840305298453893 -0.025117999999999998 0.0040707 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J020337.5 STAR, DA RA=02H03M37.5631S +/- 0.0569", J2000 V = 16.27 6-045912.90 DEC=-04D59'12.90" +/- 0.0426" 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. Teff = 25022 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.010688460376952544 -0.180378000050041 0.0055758 17824( 6) - 30-Mar-2026 17:18:55 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J034439.5 STAR, DA RA=03H44M39.5542S +/- 0.1051", J2000 V = 17.79 5-061622.25 DEC=-06D16'22.26" +/- 0.0991" Reference Frame: ICRS Extended: NO Comments: Teff = 20729 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.002333101983020986 -0.021512 0.004674 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J105838.4 STAR, DA RA=10H58M38.4439S +/- 0.0749", J2000 V = 17.02 4+224940.23 DEC=+22D49'40.23" +/- 0.0719" 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. Teff = 18542 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.001373658856810545 -0.01999000005525886 0.0053998 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD-J151732.5 STAR, DA RA=15H17M32.5133S +/- 0.0656", J2000 V = 17.78 1+425340.24 DEC=+42D53'40.23" +/- 0.0750" Reference Frame: ICRS Extended: NO Comments: Teff = 22495 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.002270973035087655 0.025881 0.0034636 ------------------------------------------------------------------------------------------------------------------------------------ 17824( 6) - 30-Mar-2026 17:18:55 - [ 5] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 7 WD-J162532.8 STAR, DA RA=16H25M32.8299S +/- 0.0379", J2000 V = 17.15 3+273356.59 DEC=+27D33'56.59" +/- 0.0489" 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. Teff = 19846 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0027041764484963316 -0.03527800004121673 0.0053548 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD-J225513.6 STAR, DA RA=22H55M13.6356S +/- 0.0967", J2000 V = 18.03 4+230944.97 DEC=+23D09'44.97" +/- 0.1011" 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. Teff = 39557 No objects in Gaia around 8 arcseconds Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0019304040105224713 -0.06305499994141428 0.0016333 ------------------------------------------------------------------------------------------------------------------------------------ 17824( 6) - 30-Mar-2026 17:18:55 - [ 6] Visit: 01 (WD-J010852.79+165838.57) 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 WD-J010852. COS/NUV ACQ/IMA PSA MIRRORB 1 3 S (3 S) 79+165838.5 GE 7 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J010852. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=493, FP-POS=3 1 1000 S 79+165838.5 G see below 7 (1096 S) Comments: Total S/N = 32 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J010852. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=493 1 1000 S 79+165838.5 G see below 7 (1096 S) Comments: Total S/N = 32 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J010852.79+16583 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 8.57 GE WD-J010852.79+16583 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1096.0 S 8.57 G WD-J010852.79+16583 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1096.0 S 8.57 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 7] Visit: 02 (WD-J014728.99+235141.34 Visit 1) 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 WD-J014728. COS/NUV ACQ/IMA PSA MIRRORB 1 15 S (15 99+235141.3 GE S) 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J014728. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=2201 1 2000 S 99+235141.3 G see below 4 (2305 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J014728. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1129 1 1000 S 99+235141.3 G see below 4 (1239 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J014728. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1129 1 1000 S 99+235141.3 G see below 4 (1239 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J014728. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=2474 1 2000 S 99+235141.3 G see below 4 (2584 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J014728.99+23514 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 1.34 GE WD-J014728.99+23514 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2305.0 S 1.34 G WD-J014728.99+23514 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 1239.0 S 1.34 G WD-J014728.99+23514 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 1239.0 S 1.34 G WD-J014728.99+23514 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2584.0 S 1.34 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 8] Visit: 03 (WD-J014728.99+235141.34 Visit 2) 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 WD-J014728. COS/NUV ACQ/IMA PSA MIRRORB 1 15 S (15 99+235141.3 GE S) 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J014728. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=2987 1 1000 S 99+235141.3 G see below 4 (1065 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J014728. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=2987 1 1000 S 99+235141.3 G see below 4 (1065 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J014728. COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=2987 1 1000 S 99+235141.3 G see below 4 (1225 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J014728. COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=2987 1 1000 S 99+235141.3 G see below 4 (1225 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD-J014728. COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=2987 1 1000 S 99+235141.3 G see below 4 (1220 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD-J014728. COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=2987 1 1000 S 99+235141.3 G see below 4 (1220 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J014728.99+23514 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 1.34 GE 17824( 6) - 30-Mar-2026 17:18:55 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J014728.99+23514 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1065.0 S 1.34 G WD-J014728.99+23514 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1065.0 S 1.34 G WD-J014728.99+23514 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 1225.0 S 1.34 G WD-J014728.99+23514 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 1225.0 S 1.34 G WD-J014728.99+23514 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1220.0 S 1.34 G WD-J014728.99+23514 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1220.0 S 1.34 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 10] Visit: 04 (WD-J020337.56-045912.90) 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 WD-J020337. COS/NUV ACQ/IMA PSA MIRRORB 1 3 S (3 S) 56-045912.9 GE 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J020337. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=491, FP-POS=3 1 1000 S 56-045912.9 G see below 0 (1091 S) Comments: Total S/N = 33 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J020337. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=491, FP-POS=4 1 1000 S 56-045912.9 G see below 0 (1091 S) Comments: Total S/N = 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J020337.56-04591 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 2.90 GE WD-J020337.56-04591 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1091.0 S 2.90 G WD-J020337.56-04591 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1091.0 S 2.90 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 11] Visit: 05 (WD-J034439.55-061622.25) 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 WD-J034439. COS/NUV ACQ/IMA PSA MIRRORB 1 12 S (12 55-061622.2 GE S) 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J034439. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=2721 1 2000 S 55-061622.2 G see below 5 (2293 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J034439. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=2721 1 1000 S 55-061622.2 G see below 5 (1211 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J034439. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=2721 1 1000 S 55-061622.2 G see below 5 (1211 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J034439. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=2721 1 2000 S 55-061622.2 G see below 5 (2535 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD-J034439. COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=2721 1 1000 S 55-061622.2 G see below 5 (1211 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD-J034439. COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=2721 1 1000 S 55-061622.2 G see below 5 (1211 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 8 WD-J034439. COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=2721 1 1000 S 55-061622.2 G see below 5 (1211 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 17824( 6) - 30-Mar-2026 17:18:55 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 9 WD-J034439. COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=2721 1 1000 S 55-061622.2 G see below 5 (1211 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J034439.55-06162 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 2.25 GE WD-J034439.55-06162 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2293.0 S 2.25 G WD-J034439.55-06162 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 1211.0 S 2.25 G WD-J034439.55-06162 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 1211.0 S 2.25 G WD-J034439.55-06162 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2535.0 S 2.25 G WD-J034439.55-06162 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1211.0 S 2.25 G WD-J034439.55-06162 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1211.0 S 2.25 G WD-J034439.55-06162 8 COS/FUV TIME-TA PSA G130M 1222 none none none none 5 1211.0 S 2.25 G WD-J034439.55-06162 9 COS/FUV TIME-TA PSA G130M 1222 none none none none 5 1211.0 S 2.25 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 13] Visit: 06 (WD-J105838.44+224940.23) 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 WD-J105838. COS/NUV ACQ/IMA PSA MIRRORB 1 10 S (10 44+224940.2 GE S) 3 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J105838. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=2348, FP-POS=3 1 1000 S 44+224940.2 G see below 3 (2315 S) Comments: Total S/N = 33 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J105838. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1222, FP-POS=4 1 1000 S 44+224940.2 G see below 3 (2553 S) Comments: Total S/N = 33 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J105838. COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2348, FP-POS=1 1 1000 S 44+224940.2 G see below 3 (1220 S) Comments: Total S/N = 33 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J105838. COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2348, FP-POS=2 1 1000 S 44+224940.2 G see below 3 (1220 S) Comments: Total S/N = 33 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD-J105838. COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2348, FP-POS=3 1 1000 S 44+224940.2 G see below 3 (1220 S) Comments: Total S/N = 33 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD-J105838. COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2348, FP-POS=4 1 1000 S 44+224940.2 G see below 3 (1220 S) Comments: Total S/N = 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J105838.44+22494 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0.23 GE 17824( 6) - 30-Mar-2026 17:18:55 - [ 14] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J105838.44+22494 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2315.0 S 0.23 G WD-J105838.44+22494 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2553.0 S 0.23 G WD-J105838.44+22494 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1220.0 S 0.23 G WD-J105838.44+22494 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1220.0 S 0.23 G WD-J105838.44+22494 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1220.0 S 0.23 G WD-J105838.44+22494 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1220.0 S 0.23 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 15] Visit: 07 (WD-J151732.51+425340.24) 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 WD-J151732. COS/NUV ACQ/IMA PSA MIRRORB 1 12 S (12 51+425340.2 GE S) 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J151732. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=2222 1 2000 S 51+425340.2 G see below 4 (2332 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J151732. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1232 1 2000 S 51+425340.2 G see below 4 (2574 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1231 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1231 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1231 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1231 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J151732.51+42534 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0.24 GE 17824( 6) - 30-Mar-2026 17:18:55 - [ 16] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J151732.51+42534 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2332.0 S 0.24 G WD-J151732.51+42534 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2574.0 S 0.24 G WD-J151732.51+42534 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1231.0 S 0.24 G WD-J151732.51+42534 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1231.0 S 0.24 G WD-J151732.51+42534 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1231.0 S 0.24 G WD-J151732.51+42534 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1231.0 S 0.24 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 17] Visit: 08 (WD-J162532.83+273356.59) 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 WD-J162532. COS/NUV ACQ/IMA PSA MIRRORB 1 8 S (8 S) 83+273356.5 GE 9 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J162532. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1109, FP-POS=3 1 2000 S 83+273356.5 G see below 9 (2323 S) Comments: Total S/N = 30 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J162532. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1131, FP-POS=3 1 1000 S 83+273356.5 G see below 9 (1241 S) Comments: Total S/N = 30 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J162532. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1131, FP-POS=4 1 1000 S 83+273356.5 G see below 9 (1241 S) Comments: Total S/N = 30 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J162532. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1239, FP-POS=4 1 2000 S 83+273356.5 G see below 9 (2588 S) Comments: Total S/N = 30 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J162532.83+27335 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 6.59 GE WD-J162532.83+27335 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2323.0 S 6.59 G WD-J162532.83+27335 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 1241.0 S 6.59 G WD-J162532.83+27335 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 1241.0 S 6.59 G WD-J162532.83+27335 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2588.0 S 6.59 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 18] Visit: 09 (WD-J225513.64+230944.97) 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 WD-J225513. COS/NUV ACQ/IMA PSA MIRRORB 1 8 S (8 S) 64+230944.9 GE 7 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J225513. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1108, FP-POS=3 1 2000 S 64+230944.9 G see below 7 (2319 S) Comments: Total S/N =30 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J225513. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1237, FP-POS=4 1 2000 S 64+230944.9 G see below 7 (2584 S) Comments: Total S/N =30 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J225513.64+23094 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 4.97 GE WD-J225513.64+23094 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2319.0 S 4.97 G WD-J225513.64+23094 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2584.0 S 4.97 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 19] Visit: 10 (visit 01 failure repeat) 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 WD-J010852. COS/NUV ACQ/IMA PSA MIRRORB 1 3 S (3 S) 79+165838.5 GE 7 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J010852. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=493, FP-POS=3 1 1000 S 79+165838.5 G see below 7 (1096 S) Comments: Total S/N = 32 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J010852. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=493 1 1000 S 79+165838.5 G see below 7 (1096 S) Comments: Total S/N = 32 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J010852.79+16583 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 8.57 GE WD-J010852.79+16583 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1096.0 S 8.57 G WD-J010852.79+16583 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1096.0 S 8.57 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 20] Visit: 11 (Visit 07 failure repeat) Visit Requirements: On Hold Comments: Additional Comments: Full repeat of visit 07 (four 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 WD-J151732. COS/NUV ACQ/IMA PSA MIRRORB 1 12 S (12 51+425340.2 GE S) 4 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J151732. COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=2222 1 2000 S 51+425340.2 G see below 4 (2285 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J151732. COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1232 1 2000 S 51+425340.2 G see below 4 (2557 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 4 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1191 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1191 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 6 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1207 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 7 WD-J151732. COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=2313 1 1000 S 51+425340.2 G see below 4 (1207 S) Comments: Total S/N = 31 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J151732.51+42534 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 0.24 GE 17824( 6) - 30-Mar-2026 17:18:55 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J151732.51+42534 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2285.0 S 0.24 G WD-J151732.51+42534 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2557.0 S 0.24 G WD-J151732.51+42534 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1191.0 S 0.24 G WD-J151732.51+42534 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 1191.0 S 0.24 G WD-J151732.51+42534 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1207.0 S 0.24 G WD-J151732.51+42534 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 1207.0 S 0.24 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 22] Visit: 12 (Visit 08 failure repeat) Visit Requirements: On Hold Comments: Additional Comments: Repeat of first orbit of visit 08. 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 WD-J162532. COS/NUV ACQ/IMA PSA MIRRORB 1 8 S (8 S) 83+273356.5 GE 9 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD-J162532. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1109, FP-POS=3 1 1000 S 83+273356.5 G see below 9 (1047 S) Comments: Total S/N = 30 ------------------------------------------------------------------------------------------------------------------------------------ 3 WD-J162532. COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1109, FP-POS=4 1 1000 S 83+273356.5 G see below 9 (1047 S) Comments: Total S/N = 30 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-J162532.83+27335 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 6.59 GE WD-J162532.83+27335 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1047.0 S 6.59 G WD-J162532.83+27335 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1047.0 S 6.59 G 17824( 6) - 30-Mar-2026 17:18:55 - [ 23] Summary Form for Proposal 17824 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1108, BUFFER-TIME=1109, BUFFER-TIME=1129, BUFFER-TIME=1131, BUFFER-TIME=1222, BUFFER-TIME=1232, BUFFER-TIME=1237, BUFFER-TIME=1239, BUFFER-TIME=2201, BUFFER-TIME=2222, BUFFER-TIME=2313, BUFFER-TIME=2348, BUFFER-TIME=2474, BUFFER-TIME=2721, BUFFER-TIME=2987, BUFFER-TIME=491, BUFFER-TIME=493, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names WD-J010852.79+165838.57, WD-J014728.99+235141.34, WD-J020337.56-045912.90, WD-J034439.55-061622.25, WD-J105838.44+224940.23, WD-J151732.51+425340.24, WD-J162532.83+273356.59, WD-J225513.64+230944.97 ------------------------------------------------------------------------------------------------------------------------------------