0 Assigned ID: 420 ----- Attempting Submission 1 (Fri Mar 06 08:29:44 GMT 2020) ----- HST Phase I Proposal 420 successfully submitted. Receipt: # 420-1 ----- Attempting Submission 2 (Fri Mar 06 20:46:14 GMT 2020) ----- A target acquisition should probably be performed before doing spectroscopy or coronography with STIS or COS. ORBIT PLANNER SERVER INTERNAL ERROR Sensitive exposures should have an ETC run number provided. Sensitive exposures should have an ETC run number provided. A target acquisition should probably be performed before doing spectroscopy or coronography with STIS or COS. ORBIT PLANNER SERVER INTERNAL ERROR Sensitive exposures should have an ETC run number provided. Sensitive exposures should have an ETC run number provided. 0 ----- Attempting Submission 1 (Tue Jun 09 09:11:03 GMT 2020) ----- - Target acqusition is not carried out, since the pointig accuray is sufficient to ensure that the moons are within the 6x6 apeture - ETC runs are not provided. Comparable exposures of Jupiter moon transits with the identical setup are ODR212010 and ODR214010. Exploiting the fortunate Jupiter transit geometry to probe Ganymede's and Callisto's atmospheres Ganymede and Callisto are primary targets of ESA's JUpiter Icy Moon Explorer (JUICE) and NASA's Europa Clipper mission: Callisto will be visited with a total of about 20 flybys. Ganymede will be the first planetary moon to be orbited by a spacecraft (JUICE). Today, the atmospheres of the two icy moons are only loosely constrained by observations. Oxygen, the domimant atmospheric species, is observable only through faint electron-excited emissions, complicating derivation of reliable neutral gas abundances or distribution due to poorly constrained electron properties. STIS spectral imaging has recently proven to be a sensitive tool for investigating Io and Europa while in transit of Jupiter: Atmospheres and plume abundances are probed through extinction of the bright Jupiter Ly-alpha background - independently of electron properties. The observing geometry now during HST Cycle 28 provides optimal conditions to also observe Ganymede and Callisto in transit of Jupiter. Both moons have long (>3.5 h) transits near the Ly-alpha-bright equator of the planet, a condition that is fulfilled only every ~6 years. We propose to observe Ganymede and Callisto during one transit of Jupiter each with two consecutive HST orbits. The observations will provide the most precise measurements of the H atmospheres and the first ever spatially resolved constraints on atmospheric H2O - from sublimation or outgassing - for the two largest moons of Jupiter. The transit geometry provides the unique opportunity to measure hemispheric differences in the atmospheres, which likely arise from the moons' surface volatile distributions as known via albedo dichotomies between the trailing and leading sides. We observe Ganymede and Callisto during one visit per target with two contiguous HST orbits each. We use STIS in the spectral mode with the G140L grating and the unsupported 6"x6" aperture. The use of this aperture is required: Both Ganymede's and Callisto's disks (~1.6" and 1.8") almost fill the widest available slit (2"), preventing a characterization of (a) the several moon radii extended H coronae and (b) the Jovian background. To minimize the geocorona signal and to maximize the moon size in the apertures the observations are to be taken max 2 month befor or after Jupiter opposition on August 20, 2021. The period +/-3 days around opposition is yet excluded to avoid phase angles below 1 deg and thus avoid the shadow of the respective moon on Jupiter to be in the background image. Target acqusition is omitted to save science exposure time. The pointing accurary of HST is sufficient to ensure the moons to be within the 6"x6" aperture. The team is composed of experts on different parts of the project from planing of the observations to data analysis and modeling for the interpretation. The PI Lorenz Roth has experience from leading five successful HST programs as PI and is currently leading a small program in Cycle 27. He has proven to lead the HST observing programs from the beginning to succesful publications. Both PI Roth and CoI Retherford have lead two HST programs with transit observations of Io and Europa (GO 13679 and GO 13805), which were technically similar or identical to the observations proposed here for Ganymede and Callisto. The Io and Europa observations were succesfully carried out and results were published in high-ranked journals (Roth et al 2017, Retherford et al 2019). Joachim Saur is expert in the plasma interactions of the Jupiter moons with the magnetosphere and will provide input plasma sputtering processes for the surface and atmosphere. Joachim Saur, Kurt Retherford and Tracy Becker have furthermore extensive experience with HST and STIS, inlcuding as PIs of several GO programs. Solar System Astronomy 6 false false true false false false false false AVAILABLE SOLAR SYSTEM SATELLITE Ganymede in transit of Jupiter STD=JUPITER STD=GANYMEDE NOT OCC OF GANYMEDE-TRANSIT BY JUPITER FROM EARTH, SEP OF GANYMEDE-TRANSIT IO FROM EARTH GT 10", SEP OF GANYMEDE-TRANSIT EUROPA FROM EARTH GT 10", SEP OF GANYMEDE-TRANSIT CALLISTO FROM EARTH GT 10", TRANSIT OF GANYMEDE ACROSS JUPITER FROM EARTH, CML OF JUPITER FROM EARTH BETWEEN 250 200 EARTH SOLAR SYSTEM This is a copy of the Ganymede target to change the CML of Jupiter in the observing windows for the HOPR repeat visits, 3-4. SATELLITE Ganymede in transit of Jupiter STD=JUPITER STD=GANYMEDE NOT OCC OF GANYMEDE-TRANSIT-COPY BY JUPITER FROM EARTH, SEP OF GANYMEDE-TRANSIT-COPY IO FROM EARTH GT 10", SEP OF GANYMEDE-TRANSIT-COPY EUROPA FROM EARTH GT 10", SEP OF GANYMEDE-TRANSIT-COPY CALLISTO FROM EARTH GT 10", TRANSIT OF GANYMEDE ACROSS JUPITER FROM EARTH, CML OF JUPITER FROM EARTH BETWEEN 340 240 EARTH SOLAR SYSTEM SATELLITE Callisto in transit of Jupiter STD=JUPITER STD=CALLISTO NOT OCC OF CALLISTO-TRANSIT BY JUPITER FROM EARTH, SEP OF CALLISTO-TRANSIT IO FROM EARTH GT 10", SEP OF CALLISTO-TRANSIT GANYMEDE FROM EARTH GT 10", TRANSIT OF CALLISTO ACROSS JUPITER FROM EARTH, CML OF JUPITER FROM EARTH BETWEEN 340 200 EARTH SOLAR SYSTEM Used with HOPR visit 52. SATELLITE Callisto in transit of Jupiter STD=JUPITER STD=CALLISTO NOT OCC OF CALLISTO-TRANSIT2 BY JUPITER FROM EARTH, SEP OF CALLISTO-TRANSIT2 IO FROM EARTH GT 10", SEP OF CALLISTO-TRANSIT2 GANYMEDE FROM EARTH GT 10", TRANSIT OF CALLISTO ACROSS JUPITER FROM EARTH, CML OF JUPITER FROM EARTH BETWEEN 310 200 EARTH STIS/FUV-MAMA Spectroscopic No No G140L 1425 STIS/FUV-MAMA Spectroscopic No No G140L 1425 Using ephemeris for target 16199-01-GANYMEDE-TRANSIT The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. /System/Volumes/Data/solaris/user1/williamj/hst/work/cycle28/OP-cache/16199-v01.xml 1630892821000 78.0 (Tic-Visit :proposal-id 16199 :visit-id "01" :proposal-version -1 :trans-version "20210514" :date "18-Aug-2021 10:21:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 730592 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16199 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16199 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2100 :al-overhead-at-end 0 :internal-dur-at-end 178 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16199 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2390 :al-overhead-at-end 0 :internal-dur-at-end 616 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0 45 HOPR repeat of orbit 1 of visit 1 1632740502000 86.69570969111601 (Tic-Visit :proposal-id 16199 :visit-id "03" :proposal-version -1 :trans-version "20210514" :date "08-Sep-2021 11:18:36.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 295712 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16199 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16199 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2018 :al-overhead-at-end 0 :internal-dur-at-end 440 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2700.0 :pcs-gap 0 ) false 1 0 53 HOPR repeat of orbit 2 of visit 1 1632745733000 89.3049713425255 (Tic-Visit :proposal-id 16199 :visit-id "04" :proposal-version -1 :trans-version "20210514" :date "08-Sep-2021 11:18:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 382720 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16199 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16199 :visit-id "04" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2498 :al-overhead-at-end 0 :internal-dur-at-end 616 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3180.0 :pcs-gap 0 ) false 1 0 Using ephemeris for target 16199-02-CALLISTO-TRANSIT The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. 1633334684000 79.44136406346519 (Tic-Visit :proposal-id 16199 :visit-id "02" :proposal-version -1 :trans-version "20200518" :date "09-Jun-2020 11:04:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 1 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 817600 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16199 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16199 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2460 :al-overhead-at-end 0 :internal-dur-at-end 354 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16199 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2750 :al-overhead-at-end 0 :internal-dur-at-end 616 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) false 2 0 Using ephemeris for target 16199-52-CALLISTO-TRANSIT2 ephemeris data for target 16199-52-CALLISTO-TRANSIT2 does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 21.218 to 25.182. ephemeris interval: 24.182 to 26.182 The scheduling data was generated by CASM 32.1.1. 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