17363( 7) - 07-Aug-2024 21:07:55 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17363 Version: 7 Check-in Time: 07-Aug-2024 21:07:55 STScI Edit Number: 3 Title WFC3 IR Time-Dependent Sensitivity: Clusters ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Varun Bajaj Space Telescope Science Institute Y CoI: Dr. Annalisa Calamida Space Telescope Science Institute Y CoI: Ms. Jennifer Mack Space Telescope Science Institute Y CoI: Dr. Debopam Som Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We continue the monitoring of the sensitivity of the WFC3/IR channel using relative photometry of the clusters M-4 and 47 Tuc, as performed in HST programs 16864, 16512, and 17260. This program serves to complement the sensitivity change slopes from the M35 scans, G102/G141 measurements, and standard star photometric monitoring. We observe the clusters M4 and 47Tuc using the same observation strategies in HST program 17260. Spefically, we propose a single epoch of M4 (using both F110W and F160W) and two epochs of 47Tuc (using solely F160W). This matches 17260 exactly, but deviates from prior programs 16864 and 16512 to balance the number of epochs of M4 and 47Tuc taken since 2020, allowing for more precise mesaurements of the sensitivity change in F160W. In future cycles the clusters will be swapped. ------------------------------------------------------------------------------------ Observations Description ------------------------ These observations copy the targets, sample sequences, NSamps, and orbit structure of previously obtained WFC3/IR observations in 17260, as this yields the fewest systematics when attempting to measure sensitivity losses over time. We simply move the between windows one year later compared to 17260, to maintain the cadence of observation. We propose a single M4 Visit to match Visit 01 of 17260, using the same filters, exposure times, sample sequences, dithers, and roll angle. This will help eliminate systematics when comparing the relative photometry. The visit consists of 4 exposures, starting with two F110W and ending with two F160W exposures. The F110W exposures will use the SPARS50 sample sequence with 14 samples. The F160W exposures will only use 13 samples, due to the shorter orbital length (matching 17260). After each exposure POSTARGS of 2.5" will be applied, to mitigate self persistence. The first visit of WFC3/IR observations of 47 Tuc (visit 02) was configued to be similar to 16864 Visit 05 (and match 17260 Visit 02 exactly), which itself was based on Visit 01 of 13563. As opposed to previous observations, the roll for the first epoch is constrained to be similar to 16964 Visit 05 (previous 17363( 7) - 07-Aug-2024 21:07:55 - [ 2] observations were unconstrained, leading to a mix of roll angles used). The structure of the visit itself is the same as 16864 (which itself differs be the next most recent epoch, from 13563, by changing the last dark to another F160W exposure). As performed in 16864 Visit 05, the last exposure is also dithered by approximately 40 pixels as this help mitigate the effect of self persistence. Visit 03 of this program repeates the observations of Visit02, but rolled at 180 degrees, and will take place approximately 6 months later, to better sample temporal changes in sensitivity. This matches 17260 Visit 03 exactly. ------------------------------------------------------------------------------------ 17363( 7) - 07-Aug-2024 21:07:55 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M-4-V1 STELLAR CLUSTER, RA=16H23M41.5344S, J2000 V = 5.9 GLOBULAR CLUSTER DEC=-26D29'54.22" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 47TUC CALIBRATION, DETECTOR RA=00H22M27.8446S +/- 0.1", J2000 V = 22.0 LINEARITY TEST DEC=-72D04'4.75" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17363( 7) - 07-Aug-2024 21:07:55 - [ 4] Visit: 01 (47Tuc Rolled) Visit Requirements: ORIENT 179.9D TO 180D FROM 02; AFTER 03 BY 2 D TO 16 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 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS25, NSAMP=13 1 DEF GS ACQ SCENARIO BASE1O3 CUM (302.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS10, NSAMP=10 1 DEF CUM (92.941 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=15 1 DEF CUM (702.939 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=15 1 DEF CUM (352.94 S) Comments: Designed to just saturate V=20 stars. ------------------------------------------------------------------------------------------------------------------------------------ 5 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=8 1 DEF CUM (352.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS10, NSAMP=10 1 DEF CUM (92.941 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=13 1 DEF POS TARG 4, 4 CUM (302.938 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 47TUC 2 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM DARK 3 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 47TUC 4 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM DARK 5 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 17363( 7) - 07-Aug-2024 21:07:55 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 47TUC 6 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 47TUC 7 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 17363( 7) - 07-Aug-2024 21:07:55 - [ 6] Visit: 02 (47Tuc) Visit Requirements: ORIENT 120D TO 135.0 D; BETWEEN 01-NOV-2023:00:00:00 AND 01-MAY-2024:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS25, NSAMP=13 1 DEF CUM (302.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS10, NSAMP=10 1 DEF CUM (92.941 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=15 1 DEF CUM (702.939 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=15 1 DEF CUM (352.94 S) Comments: Designed to just saturate V=20 stars. ------------------------------------------------------------------------------------------------------------------------------------ 5 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=15 1 DEF CUM (702.939 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS10, NSAMP=10 1 DEF CUM (92.941 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=13 1 DEF POS TARG 4, 4 CUM (302.938 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 47TUC 2 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM DARK 3 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 47TUC 4 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM DARK 5 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 17363( 7) - 07-Aug-2024 21:07:55 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 47TUC 6 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 47TUC 7 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 17363( 7) - 07-Aug-2024 21:07:55 - [ 8] Visit: 03 (47Tuc Rolled) Visit Requirements: ORIENT 179.9D TO 180D FROM 02; BETWEEN 01-AUG-2024:00:00:00 AND 01-OCT-2024:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS25, NSAMP=13 1 DEF GS ACQ SCENARIO BASE1O3 CUM (302.938 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS10, NSAMP=10 1 DEF CUM (92.941 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=15 1 DEF CUM (702.939 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=15 1 DEF CUM (352.94 S) Comments: Designed to just saturate V=20 stars. ------------------------------------------------------------------------------------------------------------------------------------ 5 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=8 1 DEF CUM (352.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS10, NSAMP=10 1 DEF CUM (92.941 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 47TUC WFC3/IR MULTIAC IR-FIX F160W SAMP-SEQ=SPARS25, NSAMP=13 1 DEF POS TARG 4, 4 CUM (302.938 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 47TUC 2 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM DARK 3 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 47TUC 4 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM DARK 5 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 17363( 7) - 07-Aug-2024 21:07:55 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 47TUC 6 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 47TUC 7 WFC3/IR MULTIAC IR-FIX F160W none none none none 1 N/A CUM 17363( 7) - 07-Aug-2024 21:07:55 - [ 10] Summary Form for Proposal 17363 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=13, NSAMP=15, NSAMP=8, SAMP-SEQ=SPARS10, SAMP-SEQ=SPARS25, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 03 BY 2 D TO 16 D, BETWEEN 01-AUG-2024:00:00:00 AND 01-OCT-2024:00:00:00, BETWEEN 01-NOV-2023:00:00:00 AND 01-MAY-2024:00:00:00, GS ACQ SCENARIO BASE1O3, ORIENT 120D TO 135.0 D, ORIENT 179.9D TO 180D FROM 02, POS TARG 4, 4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements BLANK, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 47TUC, DARK ------------------------------------------------------------------------------------------------------------------------------------