0 ORBITAL VISIBILITY OVERRUN This is the first submission of the WFC3 special calibration program 17586. Both epochs have slight visibility overruns (34 s for each orbit). Observation structure is the same from previous cycles and maintaining the same structure (including exposure times) is a requirement of this calibration program. Hopefully these overruns will not be problematic. EDIT July 24 2024: Edited visit to work with RGM, set schedulability to 40% to fit the exposures in. If not workable, we can drop an exposure from the end. EDIT July 26 2024: Attempting to resubmit with the fixes without the erroneous deletion of visit 91. Set schedulability to 80% and changed dark target to the appropriate value to get rid the overrun -1132526898 ----- Attempting Submission 1 (Thu Oct 19 23:32:35 GMT 2023) ----- ----- Attempting Submission 2 (Wed Jul 24 19:29:53 GMT 2024) ----- HST Phase II Proposal 17586 successfully submitted. Receipt: # 17586-2 ----- Attempting Submission 4 (Fri Jul 26 17:30:02 GMT 2024) ----- Both epochs have slight visibility overruns (34 s for each orbit). Observation structure is the same from previous cycles and maintaining the same structure (including exposure times) is a requirement of this calibration program. Hopefully these overruns will not be problematic The last exposure may hit an overrun, but it is a dark so the overruns shouldn't matter. Also added Mariarosa Marinelli as Co-I. WFC3 IR Time-Dependent Sensitivity: Spatial Scans 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 F140W observations performed in HST programs 14020, 16031, 16439, and 17261 as well as the F098M observations from programs 16031, 16439, and 17261. The observations will be carried out over two identical visits ~3 months apart and the observation structure in each visit is also identical with that executed in programs 16031, 16439, and 17261. The proposed data will extend the existing baseine by ~1 year and the short interval between the visits will provide additional sampling for the short-term repeatability analysis. The two spatial scan visits are identical, but executed approximately ~3 months apart. Observations in each visit is executed with the following strategy: The first observation is a simple direct image in F140W. The next 4 exposures are hortizontal spatial scans (length ~13.2") in F140W with sequential dithers of 1 arcsecond, 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 arcseconds to further mitigate persistence. There are then 3 exposures taken with F098M, with the same 1.4" dithers in between each exposure. This puts one of the target stars at the bottom of the detector, thereby not allowing any further dithering in the previous direction. Then, a large 17 arcsecond dither is performed in the -X direction (to avoid scanning on the same pixels where the star already landed), and 3 more F098M observations are taken, with subsequent dithers of 1.4" in the +Y direction. We then switch back to F140W and take 5 more observations, with dithers of 3" between exposures, as to ensure persistence is mitigated. Lastly, we take a dark exposure with the same sample sequence (but using 11 reads) as to characterize persistence. 0 true false RESTRICTED STELLAR CLUSTER OPEN CLUSTER 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. J2000 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1705579622000 90.0 (Tic-Visit :proposal-id 17586 :visit-id "01" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 19:00:19.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 408976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17586 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17586 :visit-id "01" :orbit-number 1 :pcs-time 443 :si-vis-utilization 2730 :al-overhead-at-end 0 :internal-dur-at-end 528 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3139 :pcs-gap 0 ) true 1 1 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. /Users/vbajaj/Downloads/OP-cache/17586_M35_IRscans_test-v51.xml 1708256909000 90.0 (Tic-Visit :proposal-id 17586 :visit-id "51" :proposal-version -1 :trans-version "20240604" :date "24-Jul-2024 15:14:57.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 408976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17586 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17586 :visit-id "51" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2730 :al-overhead-at-end 0 :internal-dur-at-end 528 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3028 :pcs-gap 0 ) true 1 1 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. /private/var/folders/2b/788l6xx92z9cqlwly6dwfb540001g1/T/OPVisit18094952512052147818.xml (Tic-Visit :proposal-id 17586 :visit-id "91" :proposal-version -1 :trans-version "20240604" :date "26-Jul-2024 13:04:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 408976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17586 :visit-id "91" :obset-id "91" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17586 :visit-id "91" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2560 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2976 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1711001053000 90.0 (Tic-Visit :proposal-id 17586 :visit-id "02" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 19:05:39.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 408976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17586 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17586 :visit-id "02" :orbit-number 1 :pcs-time 443 :si-vis-utilization 2730 :al-overhead-at-end 0 :internal-dur-at-end 528 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3139 :pcs-gap 0 ) true 1 1