This target is not used in this proposal. ORBITAL VISIBILITY OVERRUN Edited program to handle constraints related to RGM. Visit 01 (M-4) was no longer feasible as the target is no longer in the field of regard during the original BETWEEN window. Thus, we moved the visit to be in April 2025, and set the orient range to be 180 degrees off of the original plan. To deal with the shortened orbits, we reduced the exposure time of the last two exposures in the Visit 01. For Visit 03, we reduced the exposure time of the last dark (third to last exposure), so that the last two external images now fit within the orbit before occultation. Edit July 24 2024: Swapped M-4 Visit (01) for 47 Tuc, added constraint for execution of Visit 01 to be 2+ days after Visit 03. 1452748380 ----- Attempting Submission 1 (Thu Jul 20 21:26:05 GMT 2023) ----- ----- Attempting Submission 2 (Wed Jun 26 15:51:06 GMT 2024) ----- HST Phase II Proposal 17363 successfully submitted. Receipt: # 17363-2 ----- Attempting Submission 3 (Wed Jul 24 18:58:43 GMT 2024) ----- The visibility overrun warning regards a visit that already executed, so it can be ignored. WFC3 IR Time-Dependent Sensitivity: Clusters 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. 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 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. 0 false false RESTRICTED STELLAR CLUSTER GLOBULAR CLUSTER J2000 CALIBRATION DETECTOR LINEARITY TEST NGC104 J2000 Timing link suitability includes constraints ([01 After 03 by 2.0 to 16.0 days]) The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17363 :visit-id "01" :proposal-version -1 :trans-version "20240604" :date "24-Jul-2024 14:52:58.0" :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 1584208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17363 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17363 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2369 :al-overhead-at-end 0 :internal-dur-at-end 690 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3184 :pcs-gap 0 ) false 1 0 Designed to just saturate V=20 stars. The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. 1707618000000 134.77258 (Tic-Visit :proposal-id 17363 :visit-id "02" :proposal-version -1 :trans-version "20240604" :date "24-Jul-2024 14:53:21.0" :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 1706064 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17363 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17363 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2719 :al-overhead-at-end 0 :internal-dur-at-end 728 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3184 :pcs-gap 0 ) true 1 1 Designed to just saturate V=20 stars. Timing link suitability includes constraints ([01 After 03 by 2.0 to 16.0 days]) The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17363 :visit-id "03" :proposal-version -1 :trans-version "20240604" :date "26-Jun-2024 11:33:48.0" :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 1584208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17363 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17363 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2369 :al-overhead-at-end 0 :internal-dur-at-end 690 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3184 :pcs-gap 0 ) false 1 0 Designed to just saturate V=20 stars.