The list of Investigators does not match the STScI records for this program. ORBIT PLANNER SERVER INTERNAL ERROR I'm not sure if this is the default behavior for patterns that span multiple orbits, and if not, how to set it, but these two orbits should be executed back to back (if this is not the default behavior for a single visit/pattern). -1799506683 ----- Attempting Submission 1 (Wed Dec 21 17:20:36 GMT 2022) ----- The orbit planner server error says to check if the orbit is valid, which I believe it is, but I'm not sure how to clear it. I also added some members of the WFC3 photometry group as CO-Is. The UVIS PSF will be sampled in 5 different filters to measure the fraction of light in the PSF at large radii (>150 pixels), by exposing a bright star well past the point of saturation in the core. By observing GRW+70 5824, a frequently observed spectrophotometric standard star, we circumvent the issues high level of saturation in the core of the PSF imparted by thelong exposure times, as the flux of this source is well characterized by other calibration programs. Thus, the signal in the wings of the PSF is allowed to integrate significantly, and can be compared to the flux in the core of the PSF from other observations. This measurement of the PSF wings in these filters allows for better computation of aperture corrections for extended objects, as well as better PSF modeling. Currently, the encircled energy models for the UVIS filters terminate at 150 pixel (6 arcseconds) and are assumed to contain 100% of the light. However, measurementsof data taken in HST 11919 show that 1-2% of the flux of the source lies within 150-700 pixels in F275W/F625W. These errors in the encircled energy curves thus overpredict the amount of light inside 150 pixels, and lead to errors in the absolute measurements of flux from spatial scans. The filters chosen in this experiment are some of the most used wide band UVIS filters, and cover the majority of the wavelength range observable by the UVIS channel, so other filters encircled energy models may be adjusted via interpolating the results from these filters. The bright, isolated white dwarf star GRW+70 5824 will be observed in F225W, F336W, F475W, F555W, and F814W using pairs of long exposures, which will saturate the core of the PSF, but allow siginficant signal to be accrued in the wings of the PSF. In the first orbit, we take 6 exposures (F814W is observed twice to compensate for the source's lower brightness in this band). At the end of the first orbit, a small dither of 10.5 pixels in X and Y is applied (to mitigate bad pixel effects) and the exposures in orbit 1 are repeated. We select the same apeture (UVIS CENTER) and POS TARG used in 11919 that placed the source in amp C, as this is the most observed/stable position on the detector. This helps reduce effects from the flatfield and other calibrations having spatial errors, when compared to the typical standard star monitoring observations. The exposure times for each filter are selected to give a similar total number of electrons (and thus SNR) deposited on the detector across all 5 filters, while allowing buffer dumps during the exposure in the middle of the orbits, maximizing orbital efficiency. We use computed flash levels to bring the per pixel flash levels to approximately 20 electrons to mitigate CTE effects. 0 false false RESTRICTED CALIBRATION PHOTOMETRIC NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 POS-TARG DITHER 0.582 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 1 false 1671583693776 /Users/vbajaj/Downloads/OP-cache/17271_draft-v01.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17271 :visit-id "01" :proposal-version -1 :trans-version "20220630" :date "20-Dec-2022 19:48:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 1 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3464992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17271 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17271 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 3081 :al-overhead-at-end 124 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17271 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 3081 :al-overhead-at-end 124 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3525 :pcs-gap 0 ) true 2 0