17747( 5) - 19-Feb-2026 21:49:53 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17747 Version: 5 Check-in Time: 19-Feb-2026 21:49:53 STScI Edit Number: 0 Title Tracing star cluster motions from their birth to dispersal in the barred spiral galaxy M83 ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jin Koda State University of New York at Stony Y Brook CoI: Prof. Daniela Calzetti University of Massachusetts - Amherst N CoI: Dr. Fumi Egusa University of Tokyo, Institute of N Astronomy CoI: Dr. Akihiko Hirota National Astronomical Observatory of Japan N (NAOJ) CoI: Dr. David Thilker The Johns Hopkins University N CoI: Dr. Angela Adamo Stockholm University N ------------------------------------------------------------------------------------ Abstract We propose to image the nearby barred spiral galaxy M83 with WFC3 in NUV (F275W; 3x3 tile). The new NUV imaging, in conjunction with the substantial archival coverage in multi-bands (U, B, V, I & Halpha), is an established tool to accurately measure star cluster ages and masses by overcoming the age-extinction degeneracy. In addition, new ALMA CO(1-0) data of the full galactic disk detected 5, 724 molecular clouds to their lowest mass of 10^4Msun, and set a stage for substantial statistical analyses at every subregion within the disk. Combined with this largest and most complete cloud catalog in any external galaxy, the cluster distribution, and their spread with age, will reveal the emergence of star clusters in molecular clouds -- where and which molecular clouds can form clusters, what the cloud-cluster mass relation is, whether young clusters disperse their parental clouds or they simply drift away from the clouds, and how they disperse and merge into large-scale galactic structures and dynamics. The last point will be analyzed in relation to the debate on the origin of spiral arms --whether spiral arms are steady, long-lived structures supported by the classic density-wave theory, or transient, short-lived structures continuously generated and dispersed by swing amplification. ------------------------------------------------------------------------------------ Observations Description ------------------------ Primary WFC3: by adding mosaic imaging in F275W, this project aims to complete the HST/WFC3 multi-band photometric coverage of the closest, prototypical barred spiral galaxy M83. The proposed area (see Fig 1 yellow box) is covered by the archival data in F336W, F438W, F547M/F555W & F814W (see Fig 2 top). We aim to add F275W for the whole area (3x3 mosaic tiles, 1 visit per tile, 9 visits in total). Because of the irregular shape of the archival coverage, observing exactly the same area in F275W puts significant constraints in scheduling. We therefore request for a simple 3x3-tile for F275W, which covers a slightly larger area with some flexibility in scheduling. Each orbit consists of 4-point dither and provides 2105s exposure per pointing position. 17747( 5) - 19-Feb-2026 21:49:53 - [ 2] Parallel ACS: M83 has an extended ultraviolet (XUV) disk outside the traditional optical disk (Thilker et al. 2005; Bigiel et al. 2010). Parallel ACS observations can cover some part of the XUV disk (Fig 5). The parallel ACS could be taken at any orientation, but the southern part (as shown in Figure 5) has more UV blobs and is scientifically most optimal. We will use F475W and F814W filters in each orbit. For the 4-point dither pattern, we follow the recommendation in the report by Jay Anderson and Norman Grogin "Dithering for ACS and WFC3 Primes and Parallels" (issued Oct 18, 2023). We fiddled the exposure time at each dither position to minimize the overheads in both Primary and Parallel observations. In each visit (mosaic tile), the current setup provides 305, 700, 750, and 350 sec exposures in F275W (Primary), and 225 and 670 sec in F814W (Parallel) and 670 and 340 sec in F475W (Parallel). ------------------------------------------------------------------------------------ 17747( 5) - 19-Feb-2026 21:49:53 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M83-MOS GALAXY, DISK, SPIRAL, RA=13H37M2.5658S, J2000 V = 7.52 SPIRAL ARM DEC=-29D51'59.49" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17747( 5) - 19-Feb-2026 21:49:53 - [ 4] Visit: 19 Visit Requirements: ORIENT 301D TO 309 D; ORIENT 318D TO 324 D 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) -139.07898754918654, -159.46005158199512; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) -138.90069754918653, -157.0630415819951; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG S S) -139.17803754918654, -159.5591015819951; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG S S) -138.80164754918653, -156.96399158199512; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 6] Visit: 20 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG -0.089145, S S) -149.74093500000004; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG 0.089145, S S) -147.343925; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG -0.188195, S S) -149.839985; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG 0.188195, S S) -147.24487500000004; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S 17747( 5) - 19-Feb-2026 21:49:53 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 8] Visit: 21 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) 138.90069754918653, -140.02181841800495; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) 139.07898754918654, -137.62480841800493; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG S S) 138.80164754918653, -140.12086841800493; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG S S) 139.17803754918654, -137.52575841800495; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 10] Visit: 22 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) -139.07898754918654, -10.917621581995082; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) -138.90069754918653, -8.52061158199508; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG S S) -139.17803754918654, -11.01667158199508; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG S S) -138.80164754918653, -8.421561581995082; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 12] Visit: 23 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG -0.089145, S S) -1.1985049999999928; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG 0.089145, S S) 1.198505000000007; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG -0.188195, S S) -1.297554999999993; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG 0.188195, S S) 1.2975550000000071; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S 17747( 5) - 19-Feb-2026 21:49:53 - [ 13] 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 | ------------------------------------------------------------------------------------------------------------------------------------ ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 14] Visit: 24 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) 138.90069754918653, 8.520611581995094; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) 139.07898754918654, 10.917621581995096; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG S S) 138.80164754918653, 8.421561581995096; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG S S) 139.17803754918654, 11.016671581995094; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 15] 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 16] Visit: 25 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) -139.07898754918654, 137.62480841800493; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) -138.90069754918653, 140.02181841800495; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG S S) -139.17803754918654, 137.52575841800495; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG S S) -138.80164754918653, 140.12086841800493; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 17] 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 18] Visit: 26 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG -0.089145, S S) 147.343925; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG 0.089145, S S) 149.74093500000004; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG -0.188195, S S) 147.24487500000004; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG 0.188195, S S) 149.839985; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 19] 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 20] Visit: 27 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) 138.90069754918653, 157.0630415819951; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) 139.07898754918654, 159.46005158199512; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 740 S (740 POS TARG S S) 138.80164754918653, 156.96399158199512; PAR 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F475W 1 640 S (640 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=19 1 350 S (350 POS TARG S S) 139.17803754918654, 159.5591015819951; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F475W 1 340 S (340 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 21] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 5 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F475W none none none none 1 N/A M83-MOS 7 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 8 ACS/WFC ACCUM WFC F475W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 22] Visit: 28 Visit Requirements: SAME ORIENT AS 19 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 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=20 1 280 S (280 POS TARG S S) 138.90069754918653, 157.0630415819951; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F814W 1 215 S (215 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-MOS WFC3/UVI ACCUM UVIS-FIX F275W FLASH=18 1 700 S (700 POS TARG S S) 139.07898754918654, 159.46005158199512; PAR 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F814W 1 670 S (670 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-MOS 1 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F814W none none none none 1 N/A M83-MOS 3 WFC3/UVI ACCUM UVIS-FIX F275W none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F814W none none none none 1 N/A 17747( 5) - 19-Feb-2026 21:49:53 - [ 23] Summary Form for Proposal 17747 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-FIX, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=18, FLASH=19, FLASH=20 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 301D TO 309 D, ORIENT 318D TO 324 D, PAR 2 WITH 1, PAR 4 WITH 3, PAR 6 WITH 5, PAR 8 WITH 7, POS TARG -0.089145, -1.1985049999999928, POS TARG -0.089145, -149.74093500000004, POS TARG -0.089145, 147.343925, POS TARG -0.188195, -1.297554999999993, POS TARG -0.188195, -149.839985, POS TARG -0.188195, 147.24487500000004, POS TARG -138.80164754918653, -156.96399158199512, POS TARG -138.80164754918653, -8.421561581995082, POS TARG -138.80164754918653, 140.12086841800493, POS TARG -138.90069754918653, -157.0630415819951, POS TARG -138.90069754918653, -8.52061158199508, POS TARG -138.90069754918653, 140.02181841800495, POS TARG -139.07898754918654, -10.917621581995082, POS TARG -139.07898754918654, -159.46005158199512, POS TARG -139.07898754918654, 137.62480841800493, POS TARG -139.17803754918654, -11.01667158199508, POS TARG -139.17803754918654, -159.5591015819951, POS TARG -139.17803754918654, 137.52575841800495, POS TARG 0.089145, -147.343925, POS TARG 0.089145, 1.198505000000007, POS TARG 0.089145, 149.74093500000004, POS TARG 0.188195, -147.24487500000004, POS TARG 0.188195, 1.2975550000000071, POS TARG 0.188195, 149.839985, POS TARG 138.80164754918653, -140.12086841800493, POS TARG 138.80164754918653, 156.96399158199512, POS TARG 138.80164754918653, 8.421561581995096, POS TARG 138.90069754918653, -140.02181841800495, POS TARG 138.90069754918653, 157.0630415819951, POS TARG 138.90069754918653, 8.520611581995094, POS TARG 139.07898754918654, -137.62480841800493, POS TARG 139.07898754918654, 10.917621581995096, POS TARG 139.07898754918654, 159.46005158199512, POS TARG 139.17803754918654, -137.52575841800495, POS TARG 139.17803754918654, 11.016671581995094, POS TARG 139.17803754918654, 159.5591015819951, SAME ORIENT AS 19 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F475W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, M83-MOS ------------------------------------------------------------------------------------------------------------------------------------