Are the surfaces of the large moons of Uranus modified by charged particle bombardment?

0 Assigned ID: 1759 ----- Attempting Submission 1 (Fri Apr 09 00:10:10 GMT 2021) ----- Added orient ranges for Umbriel Leading (Visit 03). -892516947 ----- Attempting Submission 1 (Mon Jul 19 18:44:09 GMT 2021) ----- ----- Attempting Submission 4 (Fri Oct 01 23:34:19 GMT 2021) ----- HST Phase II Proposal 16704 successfully submitted. Receipt: # 16704-4 ----- Attempting Submission 5 (Fri Oct 01 23:44:46 GMT 2021) ----- ----- Attempting Submission 6 (Thu Nov 04 20:52:07 GMT 2021) ----- Your proposal could not be saved. Submission aborted. ----- Attempting Submission 7 (Fri Jul 22 22:50:53 GMT 2022) ----- I do not see any option to rerun the orbit or visit planner. They both look up-to-date on my end, at least as far as I can tell. Are the surfaces of the large moons of Uranus modified by charged particle bombardment? We propose to observe the large Uranian satellites Ariel, Umbriel, Titania, and Oberon, using the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST), to investigate whether their surface compositions are modified by charged particles trapped in Uranus' magnetosphere. The large Uranian moons are candidate ocean worlds, with surfaces that are rich in CO2 ice. The origin of CO2 ice on these moons is uncertain, but it could be formed by ongoing charged particle bombardment of native H2O ice and C-rich material on their surfaces. Alternatively, CO2 ice could be native to these moons and sourced from their interiors, hinting at recent geologic activity. To investigate whether charged particles modify these four moons' surface compositions, we will collect UV spectra and conduct a series of measurements: (1) compare the near-UV (300 nm) albedos of each moon's leading and trailing hemisphere to characterize longitudinal and radial trends in charged particle irradiation; (2) measure an absorption band that spans 257 to 360 nm, attributed to trapped OH formed by charged particle irradiation of H2O ice, on each moon's leading and trailing hemisphere to characterize longitudinal and radial trends in the distribution of this feature; (3) compare the distribution of the 280-nm trapped OH band to the distribution of CO2 ice; (4) compare these new STIS spectra that would be collected over the northern hemispheres of these moons (sub-observer lat. 55 N) to archived HST/FOS spectra that were collected over their southern hemispheres (sub-observer lat. 45 S) to characterize any latitudinal trends in charged particle irradiation that might be present. This project requests 16 orbits (~9.8 hours of science time) to observe the leading and trailing hemispheres of the Uranian satellites Ariel, Umbriel, Titania, and Oberon with the STIS spectrograph on HST, using the G230L (NUV-MAMA) and G430L (CCD) gratings. Observations with both the G230L and G430L gratings are required to achieve sufficient wavelength coverage to complete our primary objectives of measuring the near-ultraviolet albedos of these four moons' leading and trailing hemispheres (centered at 300 nm) and measuring a previously detected trapped OH band that spans ~257 to 360 nm in archived HST/FOS spectra (program 6762). The 16 orbits should be utilized as follows (text copied from selected proposal): G230L observations of these four moons' leading hemispheres (4 orbits, 2220 s of exposure time per orbit); G230L observations of their trailing hemispheres (4 orbits, 2220 s of exposure time per orbit); G430L observations of their leading hemispheres (4 orbits, 2140 s of exposure time per orbit); G430L observations of their trailing hemispheres (4 orbits, 2140 s of exposure time per orbit). To ensure that we observe each hemisphere with the G230L and G430L close in time, we require observations of each moon's leading and trailing hemisphere to occur over two sequential orbits (i.e., one orbit for the G230L and the next sequential orbit for the G430L). Furthermore, we request that the exposure times be split into two dithered exposures: G230L orbits should be split into two dithered exposures each 1110 s in length; G430L orbits should be split into two dithered exposures eacg 1070 s in length. Justify Duplications (text copied from selected proposal): Ariel, Titania, and Oberon were observed using HST/FOS in 1996 (program ID 6762). This program only collected spectra of one hemisphere of these three moons. To investigate whether charged particle bombardment is modifying the surface compositions of the Uranian satellites, it is critical that we collect UV spectra of both their leading and trailing hemispheres, which was not done in Program 6762. Additionally, to determine whether charged particle bombardment operates differently at different latitudes, we require new UV spectra of these moons' currently observable northern hemispheres (55 degrees N) to compare to the UV spectra collected over their southern hemispheres (45 degrees S) in Program 6762. Thus, duplicate observations are needed to achieve our science goals. PI Richard Cartwright (SETI Institute) has expertise in reflectance spectroscopy and spectrophotometry and radiative transfer modeling of spectral datasets for a wide range of icy bodies in the outer Solar System. He has been observing the Uranian satellites over the past nine years using ground- and space-based facilities (IRTF, LDT, Spitzer Space Telescope), and he is the PI of upcoming cycle 1 JWST observations of these moons with NIRSpec (program 1786). He has published four papers that investigate the surface compositions of the Uranian satellites in the near-infrared. PI Cartwright will have the lead role in all project tasks, including: data reduction, measurement and analysis of all collected STIS spectra, comparison of STIS data to archived FOS spectra and other datasets, and writing of all publications and conference abstracts. Co-I Bryan Holler (STScI) has extensive experience with reflectance spectroscopy of icy objects in the outer Solar System, as well as planning observations of Solar System targets with HST and JWST. He is the PI of an HST/WFC3 program that is observing the icy dwarf planet Eris (Program ID 15171). He will assist with all data reduction and analysis tasks, as well as the writing of all publications. Co-I Ted Roush (NASA Ames Research Center) has decades of experience with spectral remote sensing of planetary surfaces via telescopic observations and laboratory simulations, as well as theoretical modeling of spectral reflectance measurements from particulate surfaces for compositional interpretation. He has authored, or co-authored, over 120 peer-reviewed publications discussing solar system surface composition for diverse bodies from Mercury to Pluto. He was the PI of the previous HST/FOS observations of the Uranian satellites in 1996 (Program ID 6762). He will assist with comparison of the archived FOS data to the new STIS spectra and the writing of all publications. Co-I Will Grundy (Lowell Observatory) has HST experience dating back to his time as a Hubble fellow in the late 1990s. He has observational experience as PI or Co-I in numerous HST programs using NICMOS, WFPC2, ACS, and WFC3 to study icy outer solar system targets, and has also served on many Hubble review panels and on the Space Telescope User's Committee. Additionally, he has relevant experience studying the spectral and thermodynamic properties low temperature outer solar system materials in the laboratory, using multiple scattering radiative transfer models to simulate and interpret spectral reflectance from icy surfaces, and modeling physical and chemical processes that modify icy surfaces over time. He will assist with the analysis of all collected spectra and the writing of all publications. Co-I Amanda Hendrix (PSI) has decades of experience with observing icy bodies in the outer Solar System, in particular in the UV. She has extensive experience with STIS data reduction and analysis of Solar System objects, including the tidally-locked moons of Jupiter and Saturn. She has authored numerous papers and book chapters that describe UV observations of a wide variety og Solar System targets. She will assist with analysis of all collected spectra and writing of all publications. Co-I Tom Nordheim (Caltech/JPL) is an expert on interactions between icy satellite surfaces and magnetospherically-embedded energetic charged particles. He has written numerous peer-reviewed articles investigating these interactions in the Jovian and Saturnian systems. His upcoming research will focus on understanding these interactions in the Uranian system. He will assist with the analysis of all data and the writing of all publications. Solar System Astronomy 6 false false true false false false false SUPPORTED SOLAR SYSTEM NO Observation of Ariel's leading hemisphere. SATELLITE SATELLITE-ARIEL-LEADING-HEMISPHERE STD=URANUS STD=ARIEL NOT OCC OF ARIEL-LEADING BY URANUS FROM EARTH, RANGE ARIEL-LEADING EARTH LT 19.9, OLG OF ARIEL-LEADING FROM EARTH BETWEEN 60 120 EARTH SOLAR SYSTEM NO Observation of Umbriel's leading hemisphere. SATELLITE SATELLITE-UMBRIEL-LEADING-HEMISPHERE STD=URANUS STD=UMBRIEL NOT OCC OF UMBRIEL-LEADING BY URANUS FROM EARTH, RANGE UMBRIEL-LEADING EARTH LT 19.9, OLG OF UMBRIEL-LEADING FROM EARTH BETWEEN 60 120 EARTH SOLAR SYSTEM NO Observation of Titania's leading hemisphere. SATELLITE SATELLITE-TITANIA-LEADING-HEMISPHERE STD=URANUS STD=TITANIA NOT OCC OF TITANIA-LEADING BY URANUS FROM EARTH, RANGE TITANIA-LEADING EARTH LT 19.9, OLG OF TITANIA-LEADING FROM EARTH BETWEEN 60 120 EARTH SOLAR SYSTEM NO Observation of Oberon's leading hemisphere. SATELLITE SATELLITE-OBERON-LEADING-HEMISPHERE STD=URANUS STD=OBERON NOT OCC OF OBERON-LEADING BY URANUS FROM EARTH, RANGE OBERON-LEADING EARTH LT 19.9, OLG OF OBERON-LEADING FROM EARTH BETWEEN 60 120 EARTH SOLAR SYSTEM Observation of Ariel's trailing hemisphere. SATELLITE SATELLITE-ARIEL-LEADING-HEMISPHERE STD=URANUS STD=ARIEL NOT OCC OF ARIEL-TRAILING BY URANUS FROM EARTH, OLG OF ARIEL-TRAILING FROM EARTH BETWEEN 240 300, RANGE ARIEL-TRAILING EARTH LT 19.9 EARTH SOLAR SYSTEM NO Observation of Umbriel's trailing hemisphere. SATELLITE SATELLITE-UMBRIEL-TRAILING-HEMISPHERE STD=URANUS STD=UMBRIEL NOT OCC OF UMBRIEL-TRAILING BY URANUS FROM EARTH, RANGE UMBRIEL-LEADING EARTH LT 19.9, OLG OF UMBRIEL-TRAILING FROM EARTH BETWEEN 240 300 EARTH SOLAR SYSTEM NO Observation of Titania's trailing hemisphere. SATELLITE SATELLITE-TITANIA-TRAILING-HEMISPHERE STD=URANUS STD=TITANIA NOT OCC OF TITANIA-TRAILING BY URANUS FROM EARTH, RANGE TITANIA-LEADING EARTH LT 19.9, OLG OF TITANIA-TRAILING FROM EARTH BETWEEN 240 300 EARTH SOLAR SYSTEM NO Observation of Oberon's trailing hemisphere. SATELLITE SATELLITE-OBERON-TRAILING-HEMISPHERE STD=URANUS STD=OBERON NOT OCC OF OBERON-TRAILING BY URANUS FROM EARTH, RANGE OBERON-LEADING EARTH LT 19.9, OLG OF OBERON-TRAILING FROM EARTH BETWEEN 240 300 EARTH STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 STIS/NUV-MAMA Spectroscopic No No G230L 2376 STIS/CCD Spectroscopic No No G430L 4300 POS-TARG DITHER 2 LINE false false 3 90.0 STIS-ALONG-SLIT 1

false

1658529909667 Using ephemeris for target 16704-01-ARIEL-LEADING ephemeris data for target 16704-01-ARIEL-LEADING does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 21.341 to 23.182. ephemeris interval: 22.181 to 24.183 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/rjcartwright/Desktop/OP-cache/HST_prog16704_July2022-v01.xml An Orient Range for HST is required to assure maximum separation between the STIS slit and Uranus. The Orient Range will be added after this observation has been scheduled. (Tic-Visit :proposal-id 16704 :visit-id "01" :proposal-version -1 :trans-version "20220516" :date "22-Jul-2022 15:45:09.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "01" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 2 0 1636058970770 Using ephemeris for target 16704-02-ARIEL-TRAILING ephemeris data for target 16704-02-ARIEL-TRAILING does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 21.213 to 23.089. ephemeris interval: 21.304 to 23.305 The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. An Orient Range for HST is required to assure maximum separation between the STIS slit and Uranus. The Orient Range will be added after this observation has been scheduled. 1641535701000 73.8062154639309 (Tic-Visit :proposal-id 16704 :visit-id "02" :proposal-version -1 :trans-version "20210514" :date "04-Nov-2021 13:49:30.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "02" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0 1658529912823 Using ephemeris for target 16704-03-UMBRIEL-LEADING ephemeris data for target 16704-03-UMBRIEL-LEADING does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 21.341 to 23.182. ephemeris interval: 22.181 to 24.183 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. /Users/rjcartwright/Desktop/OP-cache/HST_prog16704_July2022-v03.xml An Orient Range for HST is required to assure maximum separation between the STIS slit and Uranus. The Orient Range will be added after this observation has been scheduled. (Tic-Visit :proposal-id 16704 :visit-id "03" :proposal-version -1 :trans-version "20220516" :date "22-Jul-2022 15:45:12.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "03" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2387 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) true 2 0 1636058972819 Using ephemeris for target 16704-04-UMBRIEL-TRAILING ephemeris data for target 16704-04-UMBRIEL-TRAILING does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 21.213 to 23.089. ephemeris interval: 21.304 to 23.305 The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. An Orient Range for HST is required to assure maximum separation between the STIS slit and Uranus. The Orient Range will be added after this observation has been scheduled. 1644412243000 71.90018685055799 (Tic-Visit :proposal-id 16704 :visit-id "04" :proposal-version -1 :trans-version "20210514" :date "04-Nov-2021 13:49:32.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "04" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2387 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "04" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0 1636058973832 Using ephemeris for target 16704-05-TITANIA-LEADING ephemeris data for target 16704-05-TITANIA-LEADING does not cover planning interval. 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We have added orient angles for these observations, which include an additional +45 deg offset for a STIS-specific requirement. 1641724433000 71.6621160957097 (Tic-Visit :proposal-id 16704 :visit-id "05" :proposal-version -1 :trans-version "20210514" :date "04-Nov-2021 13:49:33.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "05" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "05" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0 1636058975185 Using ephemeris for target 16704-06-TITANIA-TRAILING ephemeris data for target 16704-06-TITANIA-TRAILING does not cover planning interval. 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The Orient Range will be added after this observation has been scheduled. 1643571400000 71.8082962601029 (Tic-Visit :proposal-id 16704 :visit-id "06" :proposal-version -1 :trans-version "20210514" :date "04-Nov-2021 13:49:34.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "06" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "06" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0 1636058976248 Using ephemeris for target 16704-07-OBERON-LEADING ephemeris data for target 16704-07-OBERON-LEADING does not cover planning interval. 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The Orient Range will be added after this observation has been scheduled. 1644423262000 71.9048850534191 (Tic-Visit :proposal-id 16704 :visit-id "07" :proposal-version -1 :trans-version "20210514" :date "04-Nov-2021 13:49:36.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "07" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "07" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0 1636058977327 Using ephemeris for target 16704-08-OBERON-TRAILING ephemeris data for target 16704-08-OBERON-TRAILING does not cover planning interval. Physical constraints are assumed to be unschedulable outside of the ephemeris data. Planning interval: 21.213 to 23.089. ephemeris interval: 21.304 to 23.305 The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. An Orient Range for HST is required to assure maximum separation between the STIS slit and Uranus. The Orient Range will be added after this observation has been scheduled. 1643749010000 71.82598825904259 (Tic-Visit :proposal-id 16704 :visit-id "08" :proposal-version -1 :trans-version "20210514" :date "04-Nov-2021 13:49:37.0" :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 355392 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16704 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16704 :visit-id "08" :orbit-number 1 :pcs-time 393 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) (Tic-Orbit :proposal-id 16704 :visit-id "08" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2389 :al-overhead-at-end 0 :internal-dur-at-end 450 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2782 :pcs-gap 0 ) false 2 0