18367( 2) - 17-Aug-2026 17:17:47 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18367 Version: 2 Check-in Time: 17-Aug-2026 17:17:47 STScI Edit Number: 0 Title Individual He II emitting stars - origin and contribution to galactic He II emission ------------------------------------------------------------------------------------ Type Cycle GO 34 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ylva Gotberg Institute of Science and Technology Y Austria CoI: Maria Drout University of Toronto Y CoI: Dimitrios Souropanis FORTH - Institute of Astrophysics N CoI: Dr. Peter Senchyna Carnegie Institution of Washington N CoI: Mr. Alex Laroche University of Toronto N CoI: Dr. Bethany Ann Ludwig Institute of Astronomy, KU Leuven N CoI: Dr. Katie Auchettl University of Melbourne N ------------------------------------------------------------------------------------ Abstract He II emission features are ubiquitously found in low-metallicity star-forming galaxy spectra, both locally and in the early Universe. However, none of the state-of-the-art spectral population synthesis codes can explain how it is produced. This suggests that we either poorly model the stellar ionizing sources, or have not incorporated all of them. We propose to observe the UV spectra of 4 newly discovered, individual He II emitters in the Large Magellanic Cloud in order to reveal their nature and assess their importance as contributors to the He II emission from galaxies. With optical spectra at hand, we identify three likely candidate types of stars-all which are products of binary interaction: binary stripped stars, rapidly accreting white dwarfs, and accreting black holes. The far-UV continuum slope and broad variety of spectral lines will allow us to distinguish. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program will obtain UV spectra for 4 targets in the LMC whose optical spectra show HeII emission. . The goal is to obtain UV spectra that can be modelled to determine the nature of the hot ionizing source in each system. Spectra will be obtained in the FUV with the G140L grism and a center wavelength of 800 AA, providing continuous wavelength coverage between ~900-1950 AA. We will obtain 3-5 orbits per targets (separated into multiple visits of between 1-3 orbits) and use all four FP positions for each target. The impacts of a reduced gyro operations on this program are primarily reduced schedualability due to the smaller field of regard, as well as possible impacts of roll angle constraints when avoiding placement of bright field objects in the second COS aperture. Slightly longer acquisition times have only a small effect on the S/N of our observations. ------------------------------------------------------------------------------------ 18367( 2) - 17-Aug-2026 17:17:47 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SUMS-83.5720 EXT-STAR, BE, COMPOSITE RA=05H34M17.3219S +/- 0.00013", J2000 V = 18.8 3-69.04600 SPECTRAL TYPE, EMISSION DEC=-69D02'45.72" +/- 0.00012" LINE NEBULA Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 3.1877611053299795E-4 5.0E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-81.0567 EXT-STAR, BE, COMPOSITE RA=05H24M13.6296S +/- 0.2", J2000 V = 19.3 9-69.79004 SPECTRAL TYPE, EMISSION DEC=-69D47'24.14" +/- 0.2" LINE NEBULA Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-76.9279 EXT-STAR, DISK, RA=05H07M42.6986S +/- 0.00008", J2000 V = 18.1 7-69.49482 EMISSION LINE STAR DEC=-69D29'41.72" +/- 0.0001" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 3.768302049280201E-4 -6.0E-6 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-85.6322 EXT-STAR, EMISSION LINE RA=05H42M31.6953S +/- 0.00014", J2000 V = 18.8 6-68.82262 STAR, WOLF RAYET DEC=-68D49'21.61" +/- 0.00014" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016 3.2294764894241047E-4 4.9E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 18367( 2) - 17-Aug-2026 17:17:47 - [ 3] Visit: 01 (Target3 Visit 1 (3-orbits)) 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 SUMS-76.927 COS/NUV ACQ/IMA PSA MIRRORB 1 20 S (20 97-69.49482 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-76.927 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=6156, FLASH=YES, 1 1105 S 97-69.49482 G FP-POS=1, SEGMENT=A, (1105 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-76.927 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=6156, FLASH=YES, 1 1105 S 97-69.49482 G FP-POS=1, SEGMENT=A, (1105 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-76.927 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=6156, FLASH=YES, 1 1267 S 97-69.49482 G FP-POS=2, SEGMENT=A, (1267 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-76.927 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=6156, FLASH=YES, 1 1267 S 97-69.49482 G FP-POS=2, SEGMENT=A, (1267 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 6 SUMS-76.927 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=6156, FLASH=YES, 1 1266 S 97-69.49482 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 7 SUMS-76.927 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=6156, FLASH=YES, 1 1266 S 97-69.49482 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-76.92797-69.49 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 482 GE SUMS-76.92797-69.49 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 482 G SUMS-76.92797-69.49 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 482 G SUMS-76.92797-69.49 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 482 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-76.92797-69.49 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 482 G SUMS-76.92797-69.49 6 COS/FUV TIME-TA PSA G140L 800 none none none none 3 N/A 482 G SUMS-76.92797-69.49 7 COS/FUV TIME-TA PSA G140L 800 none none none none 3 N/A 482 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 5] Visit: 02 (Target4 Visit1 (2-orbits)) 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 SUMS-85.632 COS/NUV ACQ/IMA PSA MIRRORB 1 73 S (73 26-68.82262 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1056 S 26-68.82262 G FP-POS=1, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1056 S 26-68.82262 G FP-POS=2, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1266 S 26-68.82262 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1266 S 26-68.82262 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-85.63226-68.82 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 262 GE SUMS-85.63226-68.82 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 262 G SUMS-85.63226-68.82 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 262 G SUMS-85.63226-68.82 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 262 G SUMS-85.63226-68.82 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 262 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 6] Visit: 03 (Target4 Visit2 (2-orbits)) 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 SUMS-85.632 COS/NUV ACQ/IMA PSA MIRRORB 1 73 S (73 26-68.82262 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1056 S 26-68.82262 G FP-POS=1, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1056 S 26-68.82262 G FP-POS=2, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1266 S 26-68.82262 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1266 S 26-68.82262 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-85.63226-68.82 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 262 GE SUMS-85.63226-68.82 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 262 G SUMS-85.63226-68.82 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 262 G SUMS-85.63226-68.82 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 262 G SUMS-85.63226-68.82 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 262 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 7] Visit: 04 (Target4 Visit3 (1-orbit)) 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 SUMS-85.632 COS/NUV ACQ/IMA PSA MIRRORB 1 73 S (73 26-68.82262 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1056 S 26-68.82262 G FP-POS=1, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-85.632 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9530, FLASH=YES, 1 1056 S 26-68.82262 G FP-POS=2, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-85.63226-68.82 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 262 GE SUMS-85.63226-68.82 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 262 G SUMS-85.63226-68.82 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 262 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 8] Visit: 05 (Target2 Visit1 (2-orbits)) 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 SUMS-81.056 COS/NUV ACQ/IMA PSA MIRRORB 1 68 S (68 79-69.79004 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1056 S 79-69.79004 G FP-POS=1, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1056 S 79-69.79004 G FP-POS=2, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1266 S 79-69.79004 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1266 S 79-69.79004 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-81.05679-69.79 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 004 GE SUMS-81.05679-69.79 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 004 G SUMS-81.05679-69.79 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 004 G SUMS-81.05679-69.79 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 004 G SUMS-81.05679-69.79 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 004 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 9] Visit: 06 (Target2 Visit2 (2-orbits)) 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 SUMS-81.056 COS/NUV ACQ/IMA PSA MIRRORB 1 68 S (68 79-69.79004 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1056 S 79-69.79004 G FP-POS=1, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1056 S 79-69.79004 G FP-POS=2, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1266 S 79-69.79004 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1266 S 79-69.79004 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-81.05679-69.79 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 004 GE SUMS-81.05679-69.79 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 004 G SUMS-81.05679-69.79 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 004 G SUMS-81.05679-69.79 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 004 G SUMS-81.05679-69.79 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 004 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 10] Visit: 07 (Target2 Visit3 (1-orbit)) 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 SUMS-81.056 COS/NUV ACQ/IMA PSA MIRRORB 1 68 S (68 79-69.79004 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1056 S 79-69.79004 G FP-POS=1, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-81.056 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=9400, FLASH=YES, 1 1056 S 79-69.79004 G FP-POS=2, SEGMENT=A, (1056 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-81.05679-69.79 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 004 GE SUMS-81.05679-69.79 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 004 G SUMS-81.05679-69.79 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 004 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 11] Visit: 08 (Target1 Visit1 (2-orbits)) 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 SUMS-83.572 COS/NUV ACQ/IMA PSA MIRRORB 1 48 S (48 03-69.04600 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1076 S 03-69.04600 G FP-POS=1, SEGMENT=A, (1076 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1076 S 03-69.04600 G FP-POS=2, SEGMENT=A, (1076 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1266 S 03-69.04600 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1266 S 03-69.04600 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-83.57203-69.04 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 600 GE SUMS-83.57203-69.04 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 600 G SUMS-83.57203-69.04 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 600 G SUMS-83.57203-69.04 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 600 G SUMS-83.57203-69.04 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 600 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 12] Visit: 09 (Target1 Visit2 (2-orbits)) 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 SUMS-83.572 COS/NUV ACQ/IMA PSA MIRRORB 1 48 S (48 03-69.04600 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1076 S 03-69.04600 G FP-POS=1, SEGMENT=A, (1076 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1076 S 03-69.04600 G FP-POS=2, SEGMENT=A, (1076 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 4 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1266 S 03-69.04600 G FP-POS=3, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 5 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1266 S 03-69.04600 G FP-POS=4, SEGMENT=A, (1266 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-83.57203-69.04 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 600 GE SUMS-83.57203-69.04 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 600 G SUMS-83.57203-69.04 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 600 G SUMS-83.57203-69.04 4 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 600 G SUMS-83.57203-69.04 5 COS/FUV TIME-TA PSA G140L 800 none none none none 2 N/A 600 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 13] Visit: 10 (Target1 Visit3 (1-orbit)) 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 SUMS-83.572 COS/NUV ACQ/IMA PSA MIRRORB 1 48 S (48 03-69.04600 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1076 S 03-69.04600 G FP-POS=1, SEGMENT=A, (1076 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 3 SUMS-83.572 COS/FUV TIME-TA PSA G140L 800 BUFFER-TIME=8610, FLASH=YES, 1 1076 S 03-69.04600 G FP-POS=2, SEGMENT=A, (1076 S) LIFETIME-POS=LP11 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SUMS-83.57203-69.04 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 600 GE SUMS-83.57203-69.04 2 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 600 G SUMS-83.57203-69.04 3 COS/FUV TIME-TA PSA G140L 800 none none none none 1 N/A 600 G 18367( 2) - 17-Aug-2026 17:17:47 - [ 14] Summary Form for Proposal 18367 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=6156, BUFFER-TIME=8610, BUFFER-TIME=9400, BUFFER-TIME=9530, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, LIFETIME-POS=LP11, SEGMENT=A ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names SUMS-76.92797-69.49482, SUMS-81.05679-69.79004, SUMS-83.57203-69.04600, SUMS-85.63226-68.82262 ------------------------------------------------------------------------------------------------------------------------------------