17964( 2) - 01-Aug-2025 17:56:22 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17964 Version: 2 Check-in Time: 01-Aug-2025 17:56:22 STScI Edit Number: 0 Title WFC3 IR Time Dependent Sensitivity: Spatial Scans ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mariarosa Marinelli Space Telescope Science Institute Y CoI: Varun Bajaj Space Telescope Science Institute Y CoI: Ms. Jennifer Mack Space Telescope Science Institute Y ------------------------------------------------------------------------------------ Abstract We aim to measure the time dependent sensitivity loss for WFC3/IR using spatial scans of the open cluster M35. We use spatial scanning as the SNR achieved from scanning is higher than conventional staring observations. The spatial scans build on the F098M and F140W observations performed in HST programs 17684, 17586, 17261, 16439, 16031, and 14020 (F140W only). Pre-RGM, programs were designed to execute two identical visits ~3 months apart, however this is not currently feasible because RGM constrains the target visibility. Instead, we plan to execute a total of two identical visits during the window of visibility in Fall/Winter 2026. This will extend the baseline to span approximately 7 years of WFC3/IR operations, enabling high precision analysis of time-dependent sensitivity. Additionally, for both visits the short interval between each visit will provide additional sampling for the short-term repeatability. ------------------------------------------------------------------------------------ Observations Description ------------------------ The two spatial scan visits are identical. In RGM, we can no longer observe the target in the spring (as in prior cycles). Instead we observe it in the fall (flipped by 180 degrees). Because of this, we now dither in the opposite direction compared to previous programs. Additionally, we are taking one fewer exposure than in the Cycle 32 visits due to orbital timing constraints. Therefore, observations in each visit are executed with the following strategy: - The first observation is a simple direct image in F140W. - The next 4 exposures are horizontal spatial scans (length ~13.2") in F140W with sequential dithers of 1'', perpendicular to the scan direction (the +Y direction), between exposures, as to match the experiment performed in 14020. - The following 10 exposures are performed in the same way, however with dithers of 1.4'' in the +Y direction to further mitigate persistence. - There are then 4 exposures taken with F098M, with the same 1.4" dithers in between each exposure. This puts one of the target stars at the top of the detector, thereby not allowing any further dithering in the previous direction. - Next, a large 17 arcsecond dither is performed in the +X direction (to avoid scanning on the same pixels where the star already landed), and 2 more F098M observations are taken, with subsequent dithers of 1.4" in the -Y direction. - We then switch back to F140W and take 4 more observations, with dithers of 3" in the -Y direction between exposures, as to ensure persistence is mitigated. (This is one less exposure than the corresponding Cycle 32 visits.) - Lastly, we take a dark exposure with 17964( 2) - 01-Aug-2025 17:56:22 - [ 2] the same sample sequence (but using 11 reads) as to characterize persistence. ------------------------------------------------------------------------------------ 17964( 2) - 01-Aug-2025 17:56:22 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M-35 STELLAR CLUSTER, OPEN RA=06H09M2.8091S +/- 0.1", J2000 V = 5.1 CLUSTER DEC=+24D21'54.23" +/- 0.1" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. An advantage of an open cluster is that it is not too dense like a globular, and an open cluster will contain a lot of (photometrically stable) main sequence stars. ------------------------------------------------------------------------------------------------------------------------------------ 17964( 2) - 01-Aug-2025 17:56:22 - [ 4] Visit: 01 (M35 IR Scans - Epoch1) Visit Requirements: SCHED 80%; ORIENT 270D TO 270 D; BETWEEN 26-AUG-2026:00:00:00 AND 20-OCT-2026:00:00:00 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 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 SEQ 1-26 NON-INT; SAME CUM FIX S) OBSET 1-26 ------------------------------------------------------------------------------------------------------------------------------------ 2 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +1; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 3 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 4 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +3; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 5 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 6 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +5.4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 7 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +6.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 8 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +8.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 9 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +9.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 10 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +11; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 11 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +12.4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward 17964( 2) - 01-Aug-2025 17:56:22 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 12 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +13.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 13 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +15.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 14 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +16.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 15 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +18; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 16 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +19.4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 17 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +20.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 18 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +22.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 19 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +23.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 20 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +23.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 21 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +22.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 22 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +20.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 17964( 2) - 01-Aug-2025 17:56:22 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 23 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +17.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 24 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +14.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 25 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +11.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 26 DARK WFC3/IR MULTIAC IRSUB512- BLANK SAMP-SEQ=SPARS10, NSAMP=11 1 DEF (80.07 CUM FIX 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-35 1 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 2 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 3 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 4 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 5 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 6 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 7 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 8 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 9 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 10 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 11 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 12 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 13 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX 17964( 2) - 01-Aug-2025 17:56:22 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-35 14 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 15 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 16 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 17 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 18 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 19 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 20 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 21 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 22 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 23 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 24 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 25 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX DARK 26 WFC3/IR MULTIAC IRSUB512 BLANK none none none none 1 N/A CUM -FIX 17964( 2) - 01-Aug-2025 17:56:22 - [ 8] Visit: 02 (M35 IR Scans - Epoch2) Visit Requirements: SCHED 80%; ORIENT 270D TO 270 D; AFTER 01 BY 14 D TO 90 D; BETWEEN 26-AUG-2026:00:00:00 AND 16-NOV-2026:00:00:00 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 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 SEQ 1-26 NON-INT; SAME CUM FIX S) OBSET 1-26 ------------------------------------------------------------------------------------------------------------------------------------ 2 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +1; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 3 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 4 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +3; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 5 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 6 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +5.4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 7 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +6.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 8 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +8.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 9 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +9.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 10 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +11; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 17964( 2) - 01-Aug-2025 17:56:22 - [ 9] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +12.4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 12 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +13.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 13 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +15.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 14 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +16.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 15 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +18; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 16 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +19.4; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 17 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +20.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 18 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +22.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 19 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG -16.4, +23.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 20 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +23.6; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 21 M-35 WFC3/IR MULTIAC IRSUB512- F098M SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +22.2; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 22 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +20.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward 17964( 2) - 01-Aug-2025 17:56:22 - [ 10] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 23 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +17.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 24 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +14.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 25 M-35 WFC3/IR MULTIAC IRSUB512- F140W SAMP-SEQ=SPARS10, NSAMP=2 1 DEF (8.775 POS TARG +0.6, +11.8; CUM FIX S) SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 26 DARK WFC3/IR MULTIAC IRSUB512- BLANK SAMP-SEQ=SPARS10, NSAMP=11 1 DEF (80.07 CUM FIX 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-35 1 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 2 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 3 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 4 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 5 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 6 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 7 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 8 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 9 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 10 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 11 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 12 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX 17964( 2) - 01-Aug-2025 17:56:22 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-35 13 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 14 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 15 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 16 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 17 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 18 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 19 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 20 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 21 WFC3/IR MULTIAC IRSUB512 F098M none none none none 1 N/A CUM -FIX M-35 22 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 23 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 24 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX M-35 25 WFC3/IR MULTIAC IRSUB512 F140W none none none none 1 N/A CUM -FIX DARK 26 WFC3/IR MULTIAC IRSUB512 BLANK none none none none 1 N/A CUM -FIX 17964( 2) - 01-Aug-2025 17:56:22 - [ 12] Summary Form for Proposal 17964 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IRSUB512-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=11, NSAMP=2, SAMP-SEQ=SPARS10 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 14 D TO 90 D, BETWEEN 26-AUG-2026:00:00:00 AND 16-NOV-2026:00:00:00, BETWEEN 26-AUG-2026:00:00:00 AND 20-OCT-2026:00:00:00, ORIENT 270D TO 270 D, POS TARG +0.6, +11.8, POS TARG +0.6, +14.8, POS TARG +0.6, +17.8, POS TARG +0.6, +20.8, POS TARG +0.6, +22.2, POS TARG +0.6, +23.6, POS TARG -16.4, +1, POS TARG -16.4, +11, POS TARG -16.4, +12.4, POS TARG -16.4, +13.8, POS TARG -16.4, +15.2, POS TARG -16.4, +16.6, POS TARG -16.4, +18, POS TARG -16.4, +19.4, POS TARG -16.4, +2, POS TARG -16.4, +20.8, POS TARG -16.4, +22.2, POS TARG -16.4, +23.6, POS TARG -16.4, +3, POS TARG -16.4, +4, POS TARG -16.4, +5.4, POS TARG -16.4, +6.8, POS TARG -16.4, +8.2, POS TARG -16.4, +9.6, SAME OBSET 1-26, SCHED 80%, SEQ 1-26 NON-INT, SPATIAL SCAN 1.5, 0.76 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements BLANK, F098M, F140W ------------------------------------------------------------------------------------------------------------------------------------ Target Names DARK, M-35 ------------------------------------------------------------------------------------------------------------------------------------