minor correction to keywords 464133816 Assigned ID: 4060 ----- Attempting Submission 1 (Mon May 22 23:00:38 GMT 2023) ----- HST Phase I Proposal 4060 successfully submitted. Receipt: # 4060-1 ----- Attempting Submission 2 (Tue May 23 20:49:07 GMT 2023) ----- ORBITAL VISIBILITY OVERRUN windows added to support 1-gyro mode -1039575681 ----- Attempting Submission 1 (Thu Sep 14 19:10:47 GMT 2023) ----- ----- Attempting Submission 2 (Wed Jan 03 19:21:09 GMT 2024) ----- ----- Attempting Submission 3 (Mon Feb 05 18:02:00 GMT 2024) ----- ----- Attempting Submission 4 (Fri Mar 08 16:28:51 GMT 2024) ----- HST Phase II Proposal 17525 successfully submitted. Receipt: # 17525-4 ----- Attempting Submission 5 (Fri Mar 08 18:07:40 GMT 2024) ----- ----- Attempting Submission 6 (Tue Apr 16 21:06:54 GMT 2024) ----- ----- Attempting Submission 7 (Thu May 02 17:27:13 GMT 2024) ----- ----- Attempting Submission 8 (Thu Aug 01 16:36:48 GMT 2024) ----- Visit planner is stalling... (3548) Eurybates will be the first Trojan asteroid to be explored in situ when the Lucy spacecraft flies by it in August 2027. The possibility of close-up study of Eurybates' satellite, Queta, offers a unique opportunity to test whether Eurybates' unusual properties are tied to its collisional history and, more broadly, how collisional evolution shapes small body populations. It is critical to reduce the orbital uncertainty and improve knowledge of the relative position of Queta as soon as possible to enable planning for the best angular resolution and lighting conditions in the brief window when spacecraft observations can be made. With a single orbit we can reduce the positional uncertainty for Queta by almost a factor of two - which translates to a roughly equivalent gain in resolution for observations with a given angular coverage. As a secondary objective, we will collect astrometric information from trailed stars in the full UVIS aperture to improve predictions for future stellar occultations. HST is required because Queta is 8.7 magnitudes fainter than Eurybates and will be observed at a separation of approximately 0.5 arcsec - an observational regime that is unique to Hubble. Single orbit observation timed to occur when Eurybates' satellite Queta is more than 0.4 arcsec from Eurybates but is also away from elongation. This geometry gives the best discrimination between different possible orbits and hence the most improvement in knowledge of the orbit, in particular, the orbital period. The window is selected to meet this requirement. All four members of this proposal team are experts in HST observations and have collectively many decades of experience. They pioneered deep observations capable of finding small satellites, like Queta. They have a consistent track record of prompt publication of results. Solar System Astronomy 6 false false false false false false false false SUPPORTED SOLAR SYSTEM V-mag is expected brightness of the satellite. Eurybates is 8.5 mags brighter and will saturate. This is expected and consistent with previous observations that have successfully recovered the faint satellite. ASTEROID Trojan asteroid with a satellite TYPE=ASTEROID,A=5.194825660909952,E=0.08892019463262771,I=8.05897310596958 ,O=43.53959194136358,W=27.42986950746389,M=279.393486820639,EQUINOX=J2000,EPOCH=05-AUG-2019:00:00:00,EpochTimeScale=TDB EARTH SOLAR SYSTEM V-mag is expected brightness of the satellite. Eurybates is 8.5 mags brighter and will saturate. This is expected and consistent with previous observations that have successfully recovered the faint satellite. ASTEROID Trojan asteroid with a satellite TYPE=ASTEROID,A=5.194825660909952,E=0.08892019463262771,I=8.05897310596958 ,O=43.53959194136358,W=27.42986950746389,M=279.393486820639,EQUINOX=J2000,EPOCH=05-AUG-2019:00:00:00,EpochTimeScale=TDB EARTH WFC3/UVIS Imaging No No F350LP 1707155791297 Using ephemeris for target 17525-01-EURYBATES ephemeris data for target 17525-01-EURYBATES does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 23.274 to 25.089. ephemeris interval: 24.031 to 26.032 The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. 1709629641000 122.68372579747142 (Tic-Visit :proposal-id 17525 :visit-id "01" :proposal-version -1 :trans-version "20230626" :date "05-Feb-2024 12:56:22.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17525 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17525 :visit-id "01" :orbit-number 1 :pcs-time 443 :si-vis-utilization 2671 :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 3136 :pcs-gap 0 ) false 1 0 1722529557381 Using ephemeris for target 17525-51-EURYBATES-COPY ephemeris data for target 17525-51-EURYBATES-COPY does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 24.036 to 25.182. ephemeris interval: 24.213 to 26.213 The scheduling data was generated by CASM 32.1.1. CASM was run in Phase II mode. /private/var/folders/dd/hc9vrpdd56nfvg02_3n1tf5m0000gq/T/OPVisit11964727632441343406.xml (Tic-Visit :proposal-id 17525 :visit-id "51" :proposal-version -1 :trans-version "20240604" :date "01-Aug-2024 12:25:57.0" :trans-errors '(:WARNINGS 1 :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17525 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17525 :visit-id "51" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2671 :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 3005 :pcs-gap 0 ) true 1 1