17482( 8) - 27-Jan-2026 02:18:12 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17482 Version: 8 Check-in Time: 27-Jan-2026 02:18:12 STScI Edit Number: 2 Title Probing active atmospheric erosion across an adolescent planet system ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. George Zhou University of Southern Queensland Y CoI: Dr. Chelsea Huang University of Southern Queensland N CoI: Dr. Samuel Quinn Smithsonian Institution Astrophysical N Observatory CoI: David W Latham Smithsonian Institution Astrophysical N Observatory CoI: Ms. Ava Grace Morrissey Carnegie Institution for Science, N Observatories CoI: Duncan Wright University of Southern Queensland N CoI: Prof. Benjamin Pope Macquarie University N CoI: Allyson Bieryla Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract Atmospheric erosion is the universal process that shapes all small planets. We will use STIS to search for the extended neutral hydrogen exosphere around two Neptunes orbiting the 200 million year old star TOI-2076. These observations will reveal active ongoing mass loss from these planets. Detections of Lyman alpha excess around young planets is one of few direct tracers of photoevaporation in real time. We are experimentally testing the factors that influence early atmospheric erosion in young planets by observing a multiplanet system, allowing us to vary the levels of incident XUV irradiation, while holding the stellar XUV evolution history constant. The photoevaporation paradigm is thought to sculpt the entire small planet population we know today, STIS UV observations of young multiplanet systems as TOI-2076 will provide real time tests that anchor this model. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our program will observe transits of TOI-2076b with STIS MAMA-FUV G140M 1222A, and TOI-2076c with COS G130M 1309A to measure the planets' radii in Lyman alpha. We request two visits per planet, each visit will include five consecutive orbits, timed during their respective transits. Our visit timings are requested to allow for 1-2 orbits pre-transit to establish a baseline. Our timing requriement for the first exposure includes a 60 minute window to allow for scheduling flexibility. For visits 1 and 2 with STIS, the first exposure of each visit includes an ACQ and an ACQ/peak exposure. Each orbit include a single science exposure and a 17482( 8) - 27-Jan-2026 02:18:12 - [ 2] wavecal exposure, with the science exposure of the first orbit made shorter to allow for acquisition. For visits 3 and 4 with COS, the first exposure of each orbit includes an ACQ exposure. The science exposures will be performed at ------------------------------------------------------------------------------------ 17482( 8) - 27-Jan-2026 02:18:12 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 BD+40-2790 STAR, EXTRA-SOLAR RA=14H29M34.2426S +/- J2000 V = V = 9.139 +/- 0.002 PLANET, EXTRA-SOLAR 0.008117352", DEC=+39D47'25.54" -13.0761 PLANETARY SYSTEM, G +/- 0.009591927" 91 V-IV Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0118071 -0.006860000030428637 0.023832200 ------------------------------------------------------------------------------------------------------------------------------------ 17482( 8) - 27-Jan-2026 02:18:12 - [ 4] Visit: 01 (TOI2076b-visit1) Visit Requirements: SCHED 100%; Period 10.35527683 D AND ZERO-PHASE HJD2458743.72082247 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 BD+40-2790 STIS/CCD ACQ F28X50OII MIRROR 1 5 S (5 S) PHASE 0.978460 TO I 0.98883327 ------------------------------------------------------------------------------------------------------------------------------------ 2 BD+40-2790 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 1.5 S (1.5 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1500 1 1426 S -MAMA G see below (1489 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 7 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 9 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 11 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 17482( 8) - 27-Jan-2026 02:18:12 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD+40-2790 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II BD+40-2790 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND BD+40-2790 3 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 1 1489.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 1 N/A -MAMA BD+40-2790 5 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 2 2496.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 2 N/A -MAMA BD+40-2790 7 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 3 2496.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 3 N/A -MAMA BD+40-2790 9 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 4 2496.0 S -MAMA G WAVE 10 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 4 N/A -MAMA BD+40-2790 11 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 5 2496.0 S -MAMA G WAVE 12 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 5 N/A -MAMA 17482( 8) - 27-Jan-2026 02:18:12 - [ 6] Visit: 02 (TOI2076b-visit2) Visit Requirements: SCHED 100%; Period 10.35527683 D AND ZERO-PHASE HJD2458743.72082247 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 BD+40-2790 STIS/CCD ACQ F28X50OII MIRROR 1 5 S (5 S) PHASE 0.978460 TO I 0.98883327 ------------------------------------------------------------------------------------------------------------------------------------ 2 BD+40-2790 STIS/CCD ACQ/PEA 0.2X0.05N MIRROR 1 1.5 S (1.5 K D S) ------------------------------------------------------------------------------------------------------------------------------------ 3 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1500 1 1426 S -MAMA G see below (1489 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 7 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 9 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 11 BD+40-2790 STIS/FUV TIME-TA 52X0.1 G140M 1222 WAVECAL=NO, BUFFER-TIME=1300 1 2484 S -MAMA G see below (2496 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WAVE STIS/FUV ACCUM 52X0.1 G140M 1222 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 17482( 8) - 27-Jan-2026 02:18:12 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD+40-2790 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II BD+40-2790 2 STIS/CCD ACQ/PEA 0.2X0.05 MIRROR none none none none 1 N/A K ND BD+40-2790 3 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 1 1489.0 S -MAMA G WAVE 4 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 1 N/A -MAMA BD+40-2790 5 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 2 2496.0 S -MAMA G WAVE 6 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 2 N/A -MAMA BD+40-2790 7 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 3 2496.0 S -MAMA G WAVE 8 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 3 N/A -MAMA BD+40-2790 9 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 4 2496.0 S -MAMA G WAVE 10 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 4 N/A -MAMA BD+40-2790 11 STIS/FUV TIME-TA 52X0.1 G140M 1222 none none none none 5 2496.0 S -MAMA G WAVE 12 STIS/FUV ACCUM 52X0.1 G140M 1222 none none none none 5 N/A -MAMA 17482( 8) - 27-Jan-2026 02:18:12 - [ 8] Visit: 03 (TOI2076c--COSVISIT1) Visit Requirements: Period 21.01538 D AND ZERO-PHASE HJD2459274.08398 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 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S PHASE 0.9902784159990383 GE (1.298 S) TO 0.9948514846682223; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (2262 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (2262 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (2262 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (2262 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (2285 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 | ------------------------------------------------------------------------------------------------------------------------------------ 17482( 8) - 27-Jan-2026 02:18:12 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD+40-2790 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE BD+40-2790 2 COS/FUV TIME-TA PSA G130M 1327 none none none none 1 2262.0 S G BD+40-2790 3 COS/NUV ACQ/IMA PSA MIRRORB none none none none 2 N/A GE BD+40-2790 4 COS/FUV TIME-TA PSA G130M 1327 none none none none 2 2262.0 S G BD+40-2790 5 COS/NUV ACQ/IMA PSA MIRRORB none none none none 3 N/A GE BD+40-2790 6 COS/FUV TIME-TA PSA G130M 1327 none none none none 3 2262.0 S G BD+40-2790 7 COS/NUV ACQ/IMA PSA MIRRORB none none none none 4 N/A GE BD+40-2790 8 COS/FUV TIME-TA PSA G130M 1327 none none none none 4 2262.0 S G BD+40-2790 9 COS/NUV ACQ/IMA PSA MIRRORB none none none none 5 N/A GE BD+40-2790 10 COS/FUV TIME-TA PSA G130M 1327 none none none none 5 2285.0 S G 17482( 8) - 27-Jan-2026 02:18:12 - [ 10] Visit: 04 (TOI2076c--COSVISIT2) Visit Requirements: Period 21.01538 D AND ZERO-PHASE HJD2459274.08398 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 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S PHASE 0.9902784159990383 GE (1.298 S) TO 0.9948514846682223; GS ACQ SCENARIO BASE1O3 ------------------------------------------------------------------------------------------------------------------------------------ 2 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (606 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=2, LIFETIME-POS=LP3, see below SEGMENT=BOTH (606 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=4, LIFETIME-POS=LP3, see below SEGMENT=BOTH (811 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (659 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=2, LIFETIME-POS=LP3, see below SEGMENT=BOTH (659 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=4, LIFETIME-POS=LP3, see below SEGMENT=BOTH (659 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (645 S) ------------------------------------------------------------------------------------------------------------------------------------ 11 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=2, LIFETIME-POS=LP3, see below SEGMENT=BOTH (645 S) ------------------------------------------------------------------------------------------------------------------------------------ 17482( 8) - 27-Jan-2026 02:18:12 - [ 11] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 12 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S (600 G FP-POS=4, LIFETIME-POS=LP3, S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 13 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 14 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (667 S) ------------------------------------------------------------------------------------------------------------------------------------ 15 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=2, LIFETIME-POS=LP3, see below SEGMENT=BOTH (667 S) ------------------------------------------------------------------------------------------------------------------------------------ 16 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=4, LIFETIME-POS=LP3, see below SEGMENT=BOTH (667 S) ------------------------------------------------------------------------------------------------------------------------------------ 17 BD+40-2790 COS/NUV ACQ/IMA PSA MIRRORB 1 1.2976 S GE (1.298 S) ------------------------------------------------------------------------------------------------------------------------------------ 18 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=1, LIFETIME-POS=LP3, see below SEGMENT=BOTH (664 S) ------------------------------------------------------------------------------------------------------------------------------------ 19 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=2, LIFETIME-POS=LP3, see below SEGMENT=BOTH (664 S) ------------------------------------------------------------------------------------------------------------------------------------ 20 BD+40-2790 COS/FUV TIME-TA PSA G130M 1327 FLASH=YES, BUFFER-TIME=1000, 1 600 S G FP-POS=4, LIFETIME-POS=LP3, see below SEGMENT=BOTH (664 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD+40-2790 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE BD+40-2790 2 COS/FUV TIME-TA PSA G130M 1327 none none none none 1 606.0 S G BD+40-2790 3 COS/FUV TIME-TA PSA G130M 1327 none none none none 1 606.0 S G 17482( 8) - 27-Jan-2026 02:18:12 - [ 12] 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 | ------------------------------------------------------------------------------------------------------------------------------------ BD+40-2790 4 COS/FUV TIME-TA PSA G130M 1327 none none none none 1 811.0 S G BD+40-2790 5 COS/NUV ACQ/IMA PSA MIRRORB none none none none 2 N/A GE BD+40-2790 6 COS/FUV TIME-TA PSA G130M 1327 none none none none 2 659.0 S G BD+40-2790 7 COS/FUV TIME-TA PSA G130M 1327 none none none none 2 659.0 S G BD+40-2790 8 COS/FUV TIME-TA PSA G130M 1327 none none none none 2 659.0 S G BD+40-2790 9 COS/NUV ACQ/IMA PSA MIRRORB none none none none 3 N/A GE BD+40-2790 10 COS/FUV TIME-TA PSA G130M 1327 none none none none 3 645.0 S G BD+40-2790 11 COS/FUV TIME-TA PSA G130M 1327 none none none none 3 645.0 S G BD+40-2790 12 COS/FUV TIME-TA PSA G130M 1327 none none none none 3 N/A G BD+40-2790 13 COS/NUV ACQ/IMA PSA MIRRORB none none none none 4 N/A GE BD+40-2790 14 COS/FUV TIME-TA PSA G130M 1327 none none none none 4 667.0 S G BD+40-2790 15 COS/FUV TIME-TA PSA G130M 1327 none none none none 4 667.0 S G BD+40-2790 16 COS/FUV TIME-TA PSA G130M 1327 none none none none 4 667.0 S G BD+40-2790 17 COS/NUV ACQ/IMA PSA MIRRORB none none none none 5 N/A GE BD+40-2790 18 COS/FUV TIME-TA PSA G130M 1327 none none none none 5 664.0 S G BD+40-2790 19 COS/FUV TIME-TA PSA G130M 1327 none none none none 5 664.0 S G BD+40-2790 20 COS/FUV TIME-TA PSA G130M 1327 none none none none 5 664.0 S G 17482( 8) - 27-Jan-2026 02:18:12 - [ 13] Summary Form for Proposal 17482 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.05ND, 52X0.1, F28X50OIII, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV, STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/IMAGE, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1000, BUFFER-TIME=1300, BUFFER-TIME=1500, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=4, LIFETIME-POS=LP3, SEGMENT=BOTH, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1O3, PHASE 0.978460 TO 0.98883327, PHASE 0.9902784159990383 TO 0.9948514846682223, Period 10.35527683 D AND ZERO-PHASE HJD2458743.72082247, Period 21.01538 D AND ZERO-PHASE HJD2459274.08398, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G140M, MIRROR, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names BD+40-2790, WAVE ------------------------------------------------------------------------------------------------------------------------------------