0 The list of Investigators does not match the STScI records for this program. 0 ----- Attempting Submission 1 (Tue Mar 25 17:55:24 GMT 2025) ----- Added proposal CoI's, warning can be ignored Astrometric Cross Calibration for JWST and HST 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. 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. 0 false false RESTRICTED UNIDENTIFIED HIGH LATITUDE FIELD J2000 J2000 /Users/vbajaj/Downloads/OP-cache/17905_draft-v01.xml The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. 61 (Tic-Visit :proposal-id 17905 :visit-id "01" :proposal-version -1 :trans-version "20241216" :date "21-Mar-2025 13:10:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732496 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17905 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17905 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2758 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3151 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /Users/vbajaj/Downloads/OP-cache/17905_draft-v02.xml (Tic-Visit :proposal-id 17905 :visit-id "02" :proposal-version -1 :trans-version "20241216" :date "21-Mar-2025 13:10:17.0" :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 1723520 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17905 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17905 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2756 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3151 :pcs-gap 0 ) true 1 0 /Users/vbajaj/Downloads/OP-cache/17905_draft-v03.xml The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. 70 (Tic-Visit :proposal-id 17905 :visit-id "03" :proposal-version -1 :trans-version "20241216" :date "21-Mar-2025 13:10:19.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17905 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17905 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2713 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3151 :pcs-gap 0 ) true 1 0 Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. Long exposure to build signal to noise for faint stars. Utilize all available time for exposures. Long exposure to build signal to noise for faint stars. Utilize all available time for exposures.