18135( 22) - 23-Feb-2026 15:36:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18135 Version: 22 Check-in Time: 23-Feb-2026 15:36:43 STScI Edit Number: 17 Title Examining Cometary Volatile Storage Mechanisms with HST Observations of C/2024 E1 (Wierzchos) ------------------------------------------------------------------------------------ Type Cycle GO 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Dennis Bodewits Auburn University Y CoI: Dr. John W Noonan Auburn University Y CoI: Dr. Kacper Wierzchos University of Arizona N CoI: Prof. Colin Snodgrass University of Edinburgh, Institute for N Astronomy CoI: Dr. Michael R. Combi University of Michigan N CoI: Yinsi Shou University of Michigan N ------------------------------------------------------------------------------------ Abstract Sulfur is a critical yet poorly understood component of protoplanetary disk chemistry, with less than 0.1% of its cosmic abundance observed in the gas phase. Comets, as chemically primitive bodies formed in the solar nebula midplane, are key tracers of early disk composition. This proposal targets Comet C/2024 E1 (Wierzchos), a dynamically new Oort Cloud Comet with a close perihelion (0.57 au). As near-surface layers are thermally processed and stripped during solar passage, post-perihelion observations provide a unique opportunity to probe deeper, less-altered material when the coma most closely reflects the nucleus. Using HST's ultraviolet capabilities, we will measure production rates of H2O, CO, atomic carbon, and sulfur-bearing species (S, CS, S2) to derive the comet's C/O and S/O ratios, key tracers of formation conditions and chemical inheritance. These observations will test predictions of volatile depletion, sulfur sequestration, and thermal evolution in the early solar system, and provide essential constraints on the sulfur depletion problem in disk chemistry. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe comet C/2024 E1 with STIS and COS for a total of 12 orbits once it emerges from the solar keep-out zone post-perihelion, between March 7-21, 2026, when it's V-mag predicted to be 9-10. To maximize scientific return, our strategy includes 8 orbits of COSG160M to measure the SI multiplet at 1479 Angstroms and 4 orbits of STIS G230L to detect CS and OH, with simultaneous sensitivity to S2. COS will cover SI multiplets at 1479 and 1667 Angstroms, CI features at 1561 Angstroms and 1657 Angstroms, and CO Fourth Positive Group emission features (1400-1670 Angstroms). STIS, with a 52x0.5"aperture (1570-3180 Angstroms), will capture the CO Cameron bands between 1900 Angstroms and 2300 Angstroms , C2 at 2313 Angstroms CS (A-X) at 2576 Angstroms, S2 via vibrational bands between 2828-3055 Angstroms, and OH (A-X) at 2835 and 3085 Angstroms. Only HST has the UV sensitivity and spectral coverage (1600-3000 Angstroms) required for this full suite of species. ------------------------------------------------------------------------------------ 18135( 22) - 23-Feb-2026 15:36:43 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: C2024E1 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET Comet C/2024 E1 (Wierzchos) ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=0.5657650229789531, E=1.000046249044321, I=75.23814370191654 , O=108.0839600779679, W=243.642189740609, T=20-JAN-2026:18:06:46, TTimeScale=TDB, EQUINOX=J2000, EPOCH=13-FEB-2025:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 10 +/- 4 Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: C2025K1 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET C/2025 K1 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=0.3341775465431033, E=1.000258561145607, I=147.8642063372146 , O=97.55768581282922, W=271.0280864615683, T=08-OCT-2025:10:32:26, TTimeScale=TDB, EQUINOX=J2000, EPOCH=23-JUL-2025:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 10 Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 18135( 22) - 23-Feb-2026 15:36:43 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: C2025K1V2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: COMET C2025K1v2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 TYPE=COMET, Q=0.3342083770239909, E=1.000280680346033, I=147.8651441817135 , O=97.55608189140362, W=271.0229127199095, T=08-OCT-2025:10:32:46, TTimeScale=TDB, EQUINOX=J2000, EPOCH=24-JUL-2025:00:00:00, EpochTimeScale=TDB ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 12 Using JPL Horizons version #13 for orbital ephemeris Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 18135( 22) - 23-Feb-2026 15:36:43 - [ 4] Visit: 01 (COS G160M FP1) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=1, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 5] Visit: 02 (COS G160M FP2) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 BUFFER-TIME=690, FP-POS=2 1 690 S (690 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 6] Visit: 03 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 7] Visit: 04 (COS G160M FP3) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=3, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 8] Visit: 05 (COS G160M FP4) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=4, BUFFER-TIME=650 1 650 S (650 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 9] Visit: 06 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 10] Visit: 07 (COS G160M FP1) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=1, BUFFER-TIME=1200 1 1200 S G (1200 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 11] Visit: 08 (COS G160M FP2) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=2, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 12] Visit: 09 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 13] Visit: 10 (COS G160M FP3) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=3, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 14] Visit: 11 (COS G160M FP4) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 COS/FUV TIME-TA PSA G160M 1589 FP-POS=4, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 15] Visit: 12 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 16] Visit: 21 (COS G160M FP1) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=1, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 17] Visit: 22 (COS G160M FP2) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 BUFFER-TIME=690, FP-POS=2 1 690 S (690 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 18] Visit: 23 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1V2 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 19] Visit: 24 (COS G160M FP3) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=3, BUFFER-TIME=650 1 650 S (650 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 20] Visit: 25 (COS G160M FP4) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=4, BUFFER-TIME=900 1 900 S (900 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 21] Visit: 26 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1V2 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 22] Visit: 27 (COS G160M FP1) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=1, BUFFER-TIME=900 1 900 S (900 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 23] Visit: 28 (COS G160M FP2) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=2, BUFFER-TIME=650 1 650 S (650 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 24] Visit: 29 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1V2 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 25] Visit: 30 (COS G160M FP3) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=3, BUFFER-TIME=650 1 650 S (650 G 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 N/A G 18135( 22) - 23-Feb-2026 15:36:43 - [ 26] Visit: 31 (COS G160M FP4) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 COS/NUV ACQ/SEA PSA MIRRORA SCAN-SIZE=2 1 30 S (30 GS ACQ SCENARIO ONEB1OR RCH S) ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 COS/NUV ACQ/IMA PSA MIRRORA 1 30 S (30 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 COS/FUV TIME-TA PSA G160M 1589 FP-POS=4, BUFFER-TIME=900 1 670 S G see below (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 COS/NUV ACQ/SEA PSA MIRRORA none none none none 1 N/A RCH C2025K1V2 2 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE C2025K1V2 3 COS/FUV TIME-TA PSA G160M 1589 none none none none 1 900.0 S G 18135( 22) - 23-Feb-2026 15:36:43 - [ 27] Visit: 32 (STIS G230L) Visit Requirements: BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00 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 C2025K1V2 STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ 2 C2025K1V2 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1300 S -MAMA see below (1319 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 C2025K1V2 STIS/CCD ACCUM F28X50LP MIRROR 1 5 S see below (43 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 | ------------------------------------------------------------------------------------------------------------------------------------ C2025K1V2 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A C2025K1V2 2 STIS/NUV ACCUM 52X0.5 G230L 2376 none none none none 1 1319.0 S -MAMA C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 1 1 21.5 S C2025K1V2 3 STIS/CCD ACCUM F28X50LP MIRROR none none none 2 1 21.5 S 18135( 22) - 23-Feb-2026 15:36:43 - [ 28] Summary Form for Proposal 18135 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.5, F28X50LP, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/IMAGE, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1200, BUFFER-TIME=650, BUFFER-TIME=690, BUFFER-TIME=900, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SCAN-SIZE=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-NOV-2025:00:00:00 AND 30-NOV-2025:00:00:00, GS ACQ SCENARIO ONEB1OR ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G160M, G230L, MIRROR, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names C2025K1, C2025K1V2 ------------------------------------------------------------------------------------------------------------------------------------