17905( 2) - 25-Mar-2025 18:31:49 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17905 Version: 2 Check-in Time: 25-Mar-2025 18:31:49 STScI Edit Number: 0 Title Astrometric Cross Calibration for JWST and HST ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Varun Bajaj Space Telescope Science Institute Y CoI: Dr. Jay Anderson Space Telescope Science Institute Y CoI: Ms. Jennifer Mack Space Telescope Science Institute Y CoI: Tri Astraatmadja Space Telescope Science Institute Y ------------------------------------------------------------------------------------ Abstract Observe the primary JWST astrometric field in WFC3/UVIS, WFC3/IR and ACS/WFC. While this target has been observed with HST, a recent epoch will help constrain proper motions for astrometric cross-calibration. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain WFC3 and ACS observations of the Large Magellanic Cloud star field lying within the continuous viewing zone of JWST. We repeat observations of the same field taken with ACS in 2006 (program 10753) and then repeated in 2017 (program 14911) with large dithers ~one-third the FOV. The ACS astrometric catalog is used for calibrating the geometric distortion and scale of the JWST instruments and is large enough (5'x5') so that the JWST observations can be executed at any time of year. WFC3 observed this field in 2009 but with only 1 orbit each in UVIS and IR (programs 11444 and 11445). This program will be used to create an improved astrometric catalog for calibrating the geometric distortion of the JWST instruments and for cross-calibration between HST and JWST at the current epoch. In addition, the UVIS data will include a single exposure of F814W to allow for the construction of a color magnitude diagram. ACS observations in visit 03 are designed to match orientation (211 degrees) of visits 06 and 07 in program 14911 which executed on 22-Jul-2017. 90 degree rolled orients will also be allowed to increase schedulability. A total of 5 different postargs are used to cover the FOV covered in 14911. UVIS (visit 01) will be oriented -45 degrees from ACS to cover the same area of the sky, and the IR (visit 02) orientation will be set to match UVIS. For UVIS a total of 5 different postargs are used to cover most of the FOV covered by ACS. The single F814W exposure will be taken at the center of the postargs. For IR, a total of 8 postargs are used to account for the smaller individual IR exposure FOV. ------------------------------------------------------------------------------------ 17905( 2) - 25-Mar-2025 18:31:49 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LMC-FIELD-1 UNIDENTIFIED, HIGH RA=05H21M57.6500S +/- 0.1", J2000 V = 23.0 LATITUDE FIELD DEC=-69D29'54.11" +/- 0.1" Reference Frame: Other: Antiquity and Obliquity ------------------------------------------------------------------------------------------------------------------------------------ 17905( 2) - 25-Mar-2025 18:31:49 - [ 3] Visit: 01 (WFC3/UVIS) Visit Requirements: ORIENT -45D TO -45D FROM 03 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 LMC-FIELD-1 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=15 1 300 S (300 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LMC-FIELD-1 WFC3/UVI ACCUM UVIS-CENT F606W FLASH=10 1 350 S (350 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LMC-FIELD-1 WFC3/UVI ACCUM UVIS-CENT F606W FLASH=10 1 350 S (350 POS TARG 45, -45 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LMC-FIELD-1 WFC3/UVI ACCUM UVIS-CENT F606W FLASH=10 1 350 S (350 POS TARG -45, -45 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LMC-FIELD-1 WFC3/UVI ACCUM UVIS-CENT F606W FLASH=10 1 350 S (350 POS TARG -45, 45 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LMC-FIELD-1 WFC3/UVI ACCUM UVIS-CENT F606W FLASH=10 1 350 S (350 POS TARG 45, 45 S ER 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 | ------------------------------------------------------------------------------------------------------------------------------------ LMC-FIELD-1 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER LMC-FIELD-1 2 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER LMC-FIELD-1 3 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER LMC-FIELD-1 4 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER LMC-FIELD-1 5 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER LMC-FIELD-1 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER 17905( 2) - 25-Mar-2025 18:31:49 - [ 4] Visit: 02 (WFC3/IR) Visit Requirements: SAME ORIENT AS 01 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 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=10 1 DEF POS TARG 42, 0 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=10 1 DEF POS TARG 42, 47 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=12 1 DEF POS TARG 0, 47 CUM (277.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=12 1 DEF POS TARG -42, 47 CUM (277.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=12 1 DEF POS TARG -42, 0 CUM (277.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=12 1 DEF POS TARG -42, -47 CUM (277.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=12 1 DEF POS TARG 0, -47 CUM (277.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 LMC-FIELD-1 WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=11 1 DEF POS TARG 42, -47 CUM (252.937 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 | ------------------------------------------------------------------------------------------------------------------------------------ LMC-FIELD-1 1 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM LMC-FIELD-1 2 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 17905( 2) - 25-Mar-2025 18:31:49 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LMC-FIELD-1 3 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM LMC-FIELD-1 4 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM LMC-FIELD-1 5 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM LMC-FIELD-1 6 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM LMC-FIELD-1 7 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM LMC-FIELD-1 8 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 17905( 2) - 25-Mar-2025 18:31:49 - [ 6] Visit: 03 (ACS/WFC) Visit Requirements: ORIENT 211D TO 214 D; ORIENT 31D TO 34 D; ORIENT 121D TO 124 D; ORIENT 301D TO 304 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 LMC-FIELD-1 ACS/WFC ACCUM WFCENTER F606W CR-SPLIT=NO, GAIN=2.0 1 343 S (343 POS TARG 0.0, 0.0 S) Comments: Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. ------------------------------------------------------------------------------------------------------------------------------------ 2 LMC-FIELD-1 ACS/WFC ACCUM WFCENTER F606W CR-SPLIT=NO, GAIN=2.0 1 343 S (343 POS TARG 45.0, -45.0 S) Comments: Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. ------------------------------------------------------------------------------------------------------------------------------------ 3 LMC-FIELD-1 ACS/WFC ACCUM WFCENTER F606W CR-SPLIT=NO, GAIN=2.0 1 343 S (343 POS TARG -45.0, -45.0 S) Comments: Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. ------------------------------------------------------------------------------------------------------------------------------------ 4 LMC-FIELD-1 ACS/WFC ACCUM WFCENTER F606W CR-SPLIT=NO, GAIN=2.0 1 343 S (343 POS TARG -45.0, 45.0 S) Comments: Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. ------------------------------------------------------------------------------------------------------------------------------------ 5 LMC-FIELD-1 ACS/WFC ACCUM WFCENTER F606W CR-SPLIT=NO, GAIN=2.0 1 343 S (343 POS TARG 45.0, 45.0 S) Comments: Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LMC-FIELD-1 1 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A 17905( 2) - 25-Mar-2025 18:31:49 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ LMC-FIELD-1 2 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A LMC-FIELD-1 3 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A LMC-FIELD-1 4 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A LMC-FIELD-1 5 ACS/WFC ACCUM WFCENTER F606W none none none none 1 N/A 17905( 2) - 25-Mar-2025 18:31:49 - [ 8] Summary Form for Proposal 17905 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, UVIS-CENTER, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, FLASH=10, FLASH=15, GAIN=2.0, NSAMP=10, NSAMP=11, NSAMP=12, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT -45D TO -45D FROM 03, ORIENT 121D TO 124 D, ORIENT 211D TO 214 D, ORIENT 301D TO 304 D, ORIENT 31D TO 34 D, POS TARG -42, -47, POS TARG -42, 0, POS TARG -42, 47, POS TARG -45, -45, POS TARG -45, 45, POS TARG -45.0, -45.0, POS TARG -45.0, 45.0, POS TARG 0, -47, POS TARG 0, 47, POS TARG 0.0, 0.0, POS TARG 42, -47, POS TARG 42, 0, POS TARG 42, 47, POS TARG 45, -45, POS TARG 45, 45, POS TARG 45.0, -45.0, POS TARG 45.0, 45.0, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names LMC-FIELD-1 ------------------------------------------------------------------------------------------------------------------------------------