17904( 18) - 16-Feb-2026 16:30:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17904 Version: 18 Check-in Time: 16-Feb-2026 16:30:43 STScI Edit Number: 11 Title Rocky Worlds DDT: HST Observations of GJ 3929 ------------------------------------------------------------------------------------ Type Cycle GO/DD 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Hannah Diamond-Lowe Space Telescope Science Institute Y CoI: Dr. Nestor Espinoza Space Telescope Science Institute N CoI: Dr. John Henry Debes Space Telescope Science Institute - ESA - N JWST CoI: Dr. Leonardo Dos Santos Space Telescope Science Institute N CoI: Dr. Munazza Alam Space Telescope Science Institute N CoI: Rachel Cooper Space Telescope Science Institute N CoI: Tyler Baines Space Telescope Science Institute N CoI: Taylor James Bell Space Telescope Science Institute - ESA - N JWST CoI: Dr. Brett M. Morris Space Telescope Science Institute N CoI: Dr. Leonardo Ubeda Space Telescope Science Institute N CoI: Dr. Ian Wong Space Telescope Science Institute N CoI: Dr. Joshua D. Lothringer Space Telescope Science Institute N CoI: Ms. Misty Cracraft Space Telescope Science Institute N CoI: Dr. Joseph Filippazzo Space Telescope Science Institute N CoI: Rachel Plesha Space Telescope Science Institute N CoI: Mr. Douglas Ray Long Space Telescope Science Institute N CoI: Dr. Achrene Dyrek Space Telescope Science Institute - ESA - N JWST CoI: Dr. Elena Manjavacas Space Telescope Science Institute - ESA - N JWST CoI: Mees Fix Space Telescope Science Institute N CoI: Hannah Braun Space Telescope Science Institute N CoI: Kelly Lepo Space Telescope Science Institute N CoI: Ryan Kunzer Space Telescope Science Institute N CoI: Kyle Conroy Space Telescope Science Institute N CoI: Dr. Mercedes Lopez-Morales Space Telescope Science Institute N CoI: Dr. I. Neill Reid Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Rocky Worlds is a joint JWST and HST Director's Discretionary Program designed to implement the top recommendations from the Working Group on Strategic Exoplanet Initiatives with HST and JWST. The HST side of the Rocky Worlds DDT focuses on ultraviolet (UV) characterization of the nearby M-dwarf hosts of the rocky planets observed with JWST. We will use COS and STIS to measure the UV to blue-optical spectra of these stars, including UV flare monitoring and measuring the wings of the Ly-alpha profile where appropriate. With these observations we will constrain the high-energy output of these host M dwarfs in the UV, which can be applied to planetary models of atmospheric escape, as well as photochemistry if a planetary atmosphere is present. Complementary observations and analysis to fill in the rest of the M-dwarf panchromatic spectra, from the X-ray to the infrared, are encouraged. 17904( 18) - 16-Feb-2026 16:30:43 - [ 2] Each M-dwarf planet host observed by HST in the Rocky Worlds DDT program has its own Program ID. The observations in this program will focus on GJ 3929 ------------------------------------------------------------------------------------ Observations Description ------------------------ HST observations of GJ 3929. 12 orbits of flare monitoring using G130M/1222. 4 orbits of FUV line coverage with G160M/1533 which provides complete coverage with G130M/1222 of 1070-1710 Angstroms. We obtain NUV/Vis low resolution spectroscopy with STIS G230L, G430L, and G750L and the 52x0.2 slit in order to construct an accurate stellar SED. 6 orbits of G140M 52x0.05D1 observations for Lyman alpha line reconstruction. We decided to favor the narrower slit due to being close to Solar Maximum and the 52x0.05 slit rejects more geocoronal Lyman alpha at the expense of a slight decrease in expected SNR. We select timing constraints on the G140M visits to align the geocoronal lyman alpha line with the expected ISM absorption velocity relative to the radial velocity of GJ 3929 (rv_GJ3929~10 km/s). We also select the D1 position to minimize FUV detector glow. This is due to the fact that we have multiple contiguous orbits with the FUV-MAMA and the glow increases with detector on time. The expected Lyman alpha line should be faint as well and the SNR would be impacted by higher detector background. All UV observations are obtained in time-tag mode to allow for light curves to be generated in the case of a flare or serendipitous transit. For all observations we used a distance scaled version of GJ436's MUSCLES SED, or from previous G140M observations of the Lyman alpha wings. GJ436 is another M3.5V star that has been observed extensively with HST. These observations mimic characterization of other M dwarfs from previous programs. ------------------------------------------------------------------------------------ 17904( 18) - 16-Feb-2026 16:30:43 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ-3929 STAR, M V-IV RA=15H58M18.6104S +/- 0.01", J2000 V = 10 V = 12.675 +/- 0.05 DEC=+35D24'29.37" +/- 0.01" Reference Frame: ICRS Extended: NO Comments: Object has been manually updated with Gaia DR3 coordinates, proper motions, parallax, and epoch Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 -0.011701547938346945 0.3181199481169534 0.06317265565406137 ------------------------------------------------------------------------------------------------------------------------------------ 17904( 18) - 16-Feb-2026 16:30:43 - [ 4] Visit: 01 (G130M-Flare1) Visit Requirements: SCHED 100%; BETWEEN 30-JAN-2026:20:30:00 AND 30-JAN-2026:21:30:00 On Hold Comments: Additional Comments: Flare Monitoring 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 GJ-3929 COS/NUV ACQ/IMA PSA MIRRORB 1 144 S (144 GE S) Comments: 2% limitation on emission line lifetimes. Initial look is ~1 counts total in the Brightest emission line per FP-POS. We should be ok for lifetime ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=1350, 1 1874 S G LIFETIME-POS=LP4 (1874 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GJ-3929 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A G GJ-3929 3 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A G GJ-3929 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A G GJ-3929 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 N/A G 17904( 18) - 16-Feb-2026 16:30:43 - [ 5] Visit: 02 (G130M-Flare2) Visit Requirements: SCHED 100%; BETWEEN 10-FEB-2026:09:00:00 AND 10-FEB-2026:10:00:00 On Hold Comments: Additional Comments: Flare Monitoring 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 GJ-3929 COS/NUV ACQ/IMA PSA MIRRORB 1 144 S (144 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=1350, 1 1874 S G LIFETIME-POS=LP4 (1874 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GJ-3929 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A G GJ-3929 3 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A G GJ-3929 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A G GJ-3929 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 N/A G 17904( 18) - 16-Feb-2026 16:30:43 - [ 6] Visit: 03 (G130M-Flare3) Visit Requirements: SCHED 100%; BETWEEN 26-JAN-2026:00:00:00 AND 16-FEB-2026:00:00:00 On Hold Comments: Additional Comments: Flare Monitoring 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 GJ-3929 COS/NUV ACQ/IMA PSA MIRRORB 1 144 S (144 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=1, BUFFER-TIME=1350, 1 1874 S G LIFETIME-POS=LP4 (1874 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=2, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=3, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GJ-3929 COS/FUV TIME-TA PSA G130M 1222 FP-POS=4, BUFFER-TIME=1350, 1 2424 S G LIFETIME-POS=LP4 (2424 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GJ-3929 2 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A G GJ-3929 3 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A G GJ-3929 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A G GJ-3929 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 N/A G 17904( 18) - 16-Feb-2026 16:30:43 - [ 7] Visit: 05 (G160M-Coverage1) Visit Requirements: SCHED 100%; BETWEEN 26-JAN-2026:00:00:00 AND 16-FEB-2026:00:00:00 On Hold Comments: Additional Comments: FUV coverage for emission lines, primarily CIV 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 GJ-3929 COS/NUV ACQ/IMA PSA MIRRORB 1 144 S (144 GE S) Comments: Lifetime check for G160M: Initial look is ~4 counts total in the Brightest emission line per FP-POS. We should be ok. ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 COS/FUV TIME-TA PSA G160M 1533 FP-POS=1, BUFFER-TIME=1350, 1 1715 S G LIFETIME-POS=LP6 (1715 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ-3929 COS/FUV TIME-TA PSA G160M 1533 FP-POS=2, BUFFER-TIME=1350, 1 2428 S G LIFETIME-POS=LP6 (2428 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 COS/FUV TIME-TA PSA G160M 1533 FP-POS=3, BUFFER-TIME=1350, 1 2428 S G LIFETIME-POS=LP6 (2428 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GJ-3929 COS/FUV TIME-TA PSA G160M 1533 FP-POS=4, BUFFER-TIME=1350, 1 2428 S G LIFETIME-POS=LP6 (2428 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE GJ-3929 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 N/A G GJ-3929 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 N/A G GJ-3929 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 N/A G GJ-3929 5 COS/FUV TIME-TA PSA G160M 1533 none none none none 4 N/A G 17904( 18) - 16-Feb-2026 16:30:43 - [ 8] Visit: 06 (STIS-Coverage1) Visit Requirements: SCHED 100%; BETWEEN 26-JAN-2026:00:00:00 AND 16-FEB-2026:00:00:00 On Hold Comments: Additional Comments: UV/Vis characterization 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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=738, WAVECAL=NO 1 2065 S -MAMA G (2065 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=738 1 1534 S -MAMA G (1534 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/CCD ACCUM 52X0.2 G430L 4300 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 GJ-3929 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 60 S (60 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/CCD ACCUM 52X0.2 G750L 7751 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 GJ-3929 STIS/CCD ACCUM 52X0.2 G750L 7751 CR-SPLIT=2 1 20 S (20 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 CCDFLAT STIS/CCD ACCUM 0.3X0.09 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 N/A -MAMA G WAVE 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA GJ-3929 4 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 N/A -MAMA G WAVE 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WAVE 6 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none none 2 N/A GJ-3929 7 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 2 N/A GJ-3929 7 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 2 N/A WAVE 8 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none none 2 N/A GJ-3929 9 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 1 2 N/A GJ-3929 9 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 2 2 N/A CCDFLAT 10 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 2 N/A CCDFLAT 10 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 2 N/A 17904( 18) - 16-Feb-2026 16:30:43 - [ 10] Visit: 07 (STIS-G140M1) Visit Requirements: SCHED 100%; BETWEEN 01-MAY-2025:00:00:00 AND 01-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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 1778 S -MAMA G (1778 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA Comments: Using default due to STIS team recommendations ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2196 S -MAMA G (2196 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA Comments: USing default due to STIS team recommendations ------------------------------------------------------------------------------------------------------------------------------------ 6 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2196 S -MAMA G (2196 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 1 N/A -MAMA G WAVE 3 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA GJ-3929 4 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 2 N/A -MAMA G WAVE 5 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA GJ-3929 6 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 3 N/A -MAMA G 17904( 18) - 16-Feb-2026 16:30:43 - [ 11] 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 | ------------------------------------------------------------------------------------------------------------------------------------ WAVE 7 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 3 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 12] Visit: 08 (STIS-G140M2) Visit Requirements: SCHED 100%; BETWEEN 01-MAY-2025:00:00:00 AND 01-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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 1778 S -MAMA G (1778 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2196 S -MAMA G (2196 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 6 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2196 S -MAMA G (2196 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 1 N/A -MAMA G WAVE 3 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA GJ-3929 4 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 2 N/A -MAMA G WAVE 5 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 2 N/A -MAMA GJ-3929 6 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 3 N/A -MAMA G WAVE 7 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 3 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 13] Visit: 56 (STIS-Coverage1b) Visit Requirements: SCHED 100% On Hold Comments: Additional Comments: UV/Vis characterization, HOPR repeat of 2nd orbit of Visit 6 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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=738, WAVECAL=NO 1 1183 S -MAMA G (1183 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/CCD ACCUM 52X0.2 G430L 4300 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GJ-3929 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 60 S (60 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/CCD ACCUM 52X0.2 G750L 7751 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 GJ-3929 STIS/CCD ACCUM 52X0.2 G750L 7751 CR-SPLIT=NO 1 20 S (20 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 CCDFLAT STIS/CCD ACCUM 0.3X0.09 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 N/A -MAMA G WAVE 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA WAVE 4 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none none 1 N/A GJ-3929 5 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 N/A GJ-3929 5 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 N/A WAVE 6 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none none 1 N/A GJ-3929 7 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none none 1 N/A CCDFLAT 8 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 1 N/A CCDFLAT 8 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 1 N/A 17904( 18) - 16-Feb-2026 16:30:43 - [ 14] Visit: 57 (STIS-G140M1) Visit Requirements: SCHED 100% 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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2040 S -MAMA G (2040 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA Comments: Using default due to STIS team recommendations ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 1 N/A -MAMA G WAVE 3 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 15] Visit: 58 (STIS-G140M1) Visit Requirements: SCHED 100% 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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2040 S -MAMA G (2040 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA Comments: Using default due to STIS team recommendations ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 1 N/A -MAMA G WAVE 3 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 16] Visit: 59 (STIS-G140M1) Visit Requirements: SCHED 100% 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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2040 S -MAMA G (2040 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA Comments: Using default due to STIS team recommendations ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 1 N/A -MAMA G WAVE 3 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 17] Visit: 60 (STIS-G140M1) Visit Requirements: SCHED 100% 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 GJ-3929 STIS/CCD ACQ F28X50LP MIRROR 1 0.1 S (0.1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ-3929 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 BUFFER-TIME=1000, WAVECAL=NO 1 2040 S -MAMA G (2040 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/FUV ACCUM 52X0.2 G140M 1222 1 DEF (0 S) -MAMA Comments: Using default due to STIS team recommendations ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ-3929 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ-3929 2 STIS/FUV TIME-TA 52X0.2D1 G140M 1222 none none none none 1 N/A -MAMA G WAVE 3 STIS/FUV ACCUM 52X0.2 G140M 1222 none none none none 1 N/A -MAMA 17904( 18) - 16-Feb-2026 16:30:43 - [ 18] Summary Form for Proposal 17904 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.3X0.09, 52X0.2, 52X0.2D1, 52X0.2E1, F28X50LP, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1000, BUFFER-TIME=1350, BUFFER-TIME=738, CR-SPLIT=2, CR-SPLIT=NO, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, LIFETIME-POS=LP4, LIFETIME-POS=LP6, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-MAY-2025:00:00:00 AND 01-NOV-2025:00:00:00, BETWEEN 10-FEB-2026:09:00:00 AND 10-FEB-2026:10:00:00, BETWEEN 26-JAN-2026:00:00:00 AND 16-FEB-2026:00:00:00, BETWEEN 30-JAN-2026:20:30:00 AND 30-JAN-2026:21:30:00, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G140M, G160M, G230L, G430L, G750L, MIRROR, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, GJ-3929, WAVE ------------------------------------------------------------------------------------------------------------------------------------