17965( 2) - 31-Jul-2025 17:00:48 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17965 Version: 2 Check-in Time: 31-Jul-2025 17:00:48 STScI Edit Number: 0 Title HST Focus and Optical Monitor ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Isabel Rivera Space Telescope Science Institute Y CoI: Dr. Jay Anderson Space Telescope Science Institute Y CoI: Dr. Mitchell Revalski Space Telescope Science Institute Y ------------------------------------------------------------------------------------ Abstract Utilize WFC3/UVIS and ACS/WFC in parallel to observe stellar cluster members with multiple exposures over an orbit. Phase retrieval performed on the PSF in each image will be used to measure focus, with the ability to explore apparent coma, astigmatism, and third order spherical changes in WFC3. The goals are to 1) monitor the optical telescope assembly focal length for the purposes of maintaining focus within science tolerances and 2) determine focus offsets between the imagers and identify any science instrument-specific focus behavior and dependencies. ------------------------------------------------------------------------------------ Observations Description ------------------------ In Cycle 30, we converted the standard CAL/OTA monitor to a CAL/WFC3 monitor. Historically, this bi-monthly program uses the WFC3/UVIS filter F410M to take shallow subarray exposures of the sparse open cluster NGC188. Full frame ACS/WFC exposures in filter F502N are made in parallel. Phase retrieval (PR) is performed on the stellar images to measure the focus of each exposure in equivalent secondary mirror despace. These focus measurements are used to track the evolution of the focus over months and years and to inform whether a focus adjustment is required. Starting from this cycle, Cycle 33, we are utilizing an alternative strategy using four full-frame WFC3/UVIS exposures per visit with exposure times seven times longer than the original subarray exposures. This approach provides complete detector coverage across both UVIS chips and enables many of the fainter stars in the field to be viable for phase retrieval analysis. One orbit every ~2 months with WFC3/UVIS and ACS/WFC in parallel for con-focality check. Since deployment, the HST OTA has shrunk by ~150 microns, resulting in over 20 compensating Secondary Mirror (SM) adjustments away from the Primary Mirror to maintain good focus to the science instruments. This program provides the observations to determine when a secondary mirror adjustment is required. ------------------------------------------------------------------------------------ 17965( 2) - 31-Jul-2025 17:00:48 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-188-DENS STELLAR CLUSTER, OPEN RA=00H47M26.0000S, J2000 V = 20 E CLUSTER DEC=+85D15'15.00" Reference Frame: ICRS Extended: NO Comments: magnitude not relevant ------------------------------------------------------------------------------------------------------------------------------------ 17965( 2) - 31-Jul-2025 17:00:48 - [ 3] Visit: 01 Visit Requirements: SCHED 80%; BETWEEN 14-NOV-2025:00:00:00 AND 21-NOV-2025:00:00:00 On Hold Comments: Additional Comments: WFC3/UVIS with ACS in parallel for confocality check. 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 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; SEQ SE S S) 1-8 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-188-DENSE 1 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 3 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 5 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 7 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S 17965( 2) - 31-Jul-2025 17:00:48 - [ 4] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ ANY 8 ACS/WFC ACCUM WFC F502N none none none none 1 N/A 17965( 2) - 31-Jul-2025 17:00:48 - [ 5] Visit: 02 Visit Requirements: SCHED 80%; BETWEEN 10-FEB-2026:00:00:00 AND 17-FEB-2026:00:00:00 On Hold Comments: Additional Comments: WFC3/UVIS with ACS in parallel for confocality check. 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 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; SEQ SE S S) 1-8 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-188-DENSE 1 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 3 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 5 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 7 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S 17965( 2) - 31-Jul-2025 17:00:48 - [ 6] 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 8 ACS/WFC ACCUM WFC F502N none none none none 1 N/A 17965( 2) - 31-Jul-2025 17:00:48 - [ 7] Visit: 03 Visit Requirements: SCHED 80%; BETWEEN 03-APR-2026:00:00:00 AND 10-APR-2026:00:00:00 On Hold Comments: Additional Comments: WFC3/UVIS with ACS in parallel for confocality check. 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 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; SEQ SE S S) 1-8 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-188-DENSE 1 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 3 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 5 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 7 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S 17965( 2) - 31-Jul-2025 17:00:48 - [ 8] 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 8 ACS/WFC ACCUM WFC F502N none none none none 1 N/A 17965( 2) - 31-Jul-2025 17:00:48 - [ 9] Visit: 04 Visit Requirements: SCHED 80%; BETWEEN 28-JUN-2026:00:00:00 AND 05-JUL-2026:00:00:00 On Hold Comments: Additional Comments: WFC3/UVIS with ACS in parallel for confocality check. 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 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; SEQ SE S S) 1-8 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-188-DENSE 1 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 3 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 5 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 7 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S 17965( 2) - 31-Jul-2025 17:00:48 - [ 10] 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 8 ACS/WFC ACCUM WFC F502N none none none none 1 N/A 17965( 2) - 31-Jul-2025 17:00:48 - [ 11] Visit: 05 Visit Requirements: SCHED 80%; BETWEEN 16-AUG-2026:00:00:00 AND 23-AUG-2026:00:00:00 On Hold Comments: Additional Comments: WFC3/UVIS with ACS in parallel for confocality check. 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 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; SEQ SE S S) 1-8 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-188-DENSE 1 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 3 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 5 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 7 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S 17965( 2) - 31-Jul-2025 17:00:48 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ANY 8 ACS/WFC ACCUM WFC F502N none none none none 1 N/A 17965( 2) - 31-Jul-2025 17:00:48 - [ 13] Visit: 06 Visit Requirements: SCHED 80%; BETWEEN 03-OCT-2026:00:00:00 AND 10-OCT-2026:00:00:00 On Hold Comments: Additional Comments: WFC3/UVIS with ACS in parallel for confocality check. 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 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; SEQ SE S S) 1-8 NON-INT; PAR 2 WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 4 WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 6 WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-188-DEN WFC3/UVI ACCUM UVIS F410M CR-SPLIT=NO, FLASH=20 1 350 S (350 POS TARG 0.0, -41.0; PAR SE S S) 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY ACS/WFC ACCUM WFC F502N 1 350 S (350 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-188-DENSE 1 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 2 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 3 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 4 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 5 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S ANY 6 ACS/WFC ACCUM WFC F502N none none none none 1 N/A NGC-188-DENSE 7 WFC3/UVI ACCUM UVIS F410M none none none none 1 N/A S 17965( 2) - 31-Jul-2025 17:00:48 - [ 14] 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 8 ACS/WFC ACCUM WFC F502N none none none none 1 N/A 17965( 2) - 31-Jul-2025 17:00:48 - [ 15] Summary Form for Proposal 17965 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, FLASH=20 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 03-APR-2026:00:00:00 AND 10-APR-2026:00:00:00, BETWEEN 03-OCT-2026:00:00:00 AND 10-OCT-2026:00:00:00, BETWEEN 10-FEB-2026:00:00:00 AND 17-FEB-2026:00:00:00, BETWEEN 14-NOV-2025:00:00:00 AND 21-NOV-2025:00:00:00, BETWEEN 16-AUG-2026:00:00:00 AND 23-AUG-2026:00:00:00, BETWEEN 28-JUN-2026:00:00:00 AND 05-JUL-2026:00:00:00, PAR 2 WITH 1, PAR 4 WITH 3, PAR 6 WITH 5, PAR 8 WITH 7, POS TARG 0.0, -41.0, SCHED 80%, SEQ 1-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F410M, F502N ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, NGC-188-DENSE ------------------------------------------------------------------------------------------------------------------------------------