17727( 11) - 08-Dec-2025 21:25:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17727 Version: 11 Check-in Time: 08-Dec-2025 21:25:16 STScI Edit Number: 8 Title STIS spectroscopy of Amalthea and Thebe: Surface composition and interactions with Jupiter's magnetosphere and rings ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Pippa Molyneux Southwest Research Institute Y CoI: Dr. Tracy M Becker Southwest Research Institute N CoI: Dr. Joshua Kammer Southwest Research Institute N CoI: Dr. Kurt David Retherford Southwest Research Institute N ------------------------------------------------------------------------------------ Abstract Jupiter's inner moons are an important aspect of the Jupiter system, acting and sources and sinks for the rings and providing clues to the evolution of the system as a whole. However, very few spectral observations of the inner satellites have been performed to date, and the only previous observations by HST, which were obtained using the Faint Object Spectrograph, suffer from instrumental artifacts that hamper their interpretation. We propose new STIS observations of the largest inner moons, Amalthea and Thebe, to investigate their surface compositions and search for signatures of interactions with the Jovian magnetospheric plasma. We will also constrain their grain sizes, providing insight on the contribution of electrostatic lofting to Jupiter's gossamer rings. We plan to observe Thebe using the G230L and G430L gratings, to search for absorption features related to sulfur species and reflectance peaks associated with small grains. At Amalthea, we will perform similar observations and also use G750L to search for a 0.7-micron absorption related to hydrated silicates, constraining the origin of a 3-micron absorption feature previously observed on the trailing hemisphere. The proposed observations are highly relevant to future observation of the Jupiter system by JUICE, providing the opportunity to investigate temporal variations and filling a gap between the JUICE-UVS and MAJIS spectrographs. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our program aims to obtain STIS spectra of Jupiter's largest inner moons, Amalthea and Thebe, from the mid-UV through visible wavelengths. We will use two orbits to observe the leading and trailing hemispheres of Thebe. Each orbit includes one observation using STIS G230L and one using STIS 430L. For Amalthea we require two 2-orbit visits: one visit to observe the leading hemisphere and one to observe the trailing hemisphere. The first orbit of each visit is a stare using the STIS G230L mode for the longest time possible. The second orbit uses the STIS G430L and G730L modes, but with a narrower slit which we step across Amalthea in three steps to constrain any spatial variability in surface composition. 17727( 11) - 08-Dec-2025 21:25:16 - [ 2] For ETC runs we used a Castelli-Kurucz G2V model to represent the expected reflected solar spectrum. We used the largest angular diameters expected during Cycle 32 (0.084 arcsec for Amalthea; 0.039 arcsec for Thebe) and Vmag/arcsec^2 values from JPL Horizons. We have requested observations within 8 weeks of Jupiter opposition on 7 Dec 2024 to maximize the apparent size and brightness of both objects. This is particularly important for Thebe, which is the smaller, dimmer object. ------------------------------------------------------------------------------------ 17727( 11) - 08-Dec-2025 21:25:16 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: AMALTHEA-LEADING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE SATELLITE AMALTHEA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER STD=AMALTHEA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF AMALTHEA-LEADING BY JUPITER FROM EARTH, SEP OF AMALTHEA-LEADING IO FROM EARTH GT 25", SEP OF AMALTHEA-LEADING EUROPA FROM EARTH GT 25", SEP OF AMALTHEA-LEADING GANYMEDE FROM EARTH GT 25", SEP OF AMALTHEA-LEADING CALLISTO FROM EARTH GT 25", OLG OF AMALTHEA-LEADING BETWEEN 50 130, SEP OF AMALTHEA-LEADING JUPITER FROM EARTH GT 30" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 14 +/- 0.2 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 17727( 11) - 08-Dec-2025 21:25:16 - [ 4] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: AMALTHEA-TRAILING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE SATELLITE AMALTHEA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER STD=AMALTHEA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF AMALTHEA-TRAILING BY JUPITER FROM EARTH, SEP OF AMALTHEA-TRAILING IO FROM EARTH GT 25", SEP OF AMALTHEA-TRAILING EUROPA FROM EARTH GT 25", SEP OF AMALTHEA-TRAILING GANYMEDE FROM EARTH GT 25", SEP OF AMALTHEA-TRAILING CALLISTO FROM EARTH GT 25", OLG OF AMALTHEA-TRAILING BETWEEN 230 310, SEP OF AMALTHEA-TRAILING JUPITER FROM EARTH GT 30" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 14 +/- 0.2 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 17727( 11) - 08-Dec-2025 21:25:16 - [ 5] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: THEBE-LEADING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE SATELLITE THEBE ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER STD=THEBE ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF THEBE-LEADING BY JUPITER FROM EARTH, SEP OF THEBE-LEADING IO FROM EARTH GT 20", SEP OF THEBE-LEADING EUROPA FROM EARTH GT 20", SEP OF THEBE-LEADING GANYMEDE FROM EARTH GT 20", SEP OF THEBE-LEADING CALLISTO FROM EARTH GT 20", OLG OF THEBE-LEADING BETWEEN 75 105, SEP OF THEBE-LEADING JUPITER FROM EARTH GT 30" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 15.7 +/- 0.2 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 17727( 11) - 08-Dec-2025 21:25:16 - [ 6] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 4 TARGET NAME: THEBE-TRAILING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE SATELLITE THEBE ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER STD=THEBE ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF THEBE-TRAILING BY JUPITER FROM EARTH, SEP OF THEBE-TRAILING IO FROM EARTH GT 30", SEP OF THEBE-TRAILING EUROPA FROM EARTH GT 30", SEP OF THEBE-TRAILING GANYMEDE FROM EARTH GT 30", SEP OF THEBE-TRAILING CALLISTO FROM EARTH GT 30", OLG OF THEBE-TRAILING BETWEEN 255 285, SEP OF THEBE-TRAILING JUPITER FROM EARTH GT 30" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 15.7 +/- 0.2 Ephemeris Center: EARTH ------------------------------------------------------------------------------------------------------------------------------------ 17727( 11) - 08-Dec-2025 21:25:16 - [ 7] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-PERP-TO-SLIT Pattern_Purpose MOSAIC Number_Of_Points 3 Point_Spacing 0.025 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0.0 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 17727( 11) - 08-Dec-2025 21:25:16 - [ 8] Visit: 01 (ThebeLead) Visit Requirements: BETWEEN 12-OCT-2024:00:00:00 AND 01-FEB-2025:00:00:00 On Hold Comments: Additional Comments: Single orbit visit to observe Thebe's leading hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 THEBE-LEADI STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) NG ------------------------------------------------------------------------------------------------------------------------------------ 2 THEBE-LEADI STIS/CCD ACCUM 52X0.2E1 G430L 4300 SIZEAXIS2=80 1 110 S NG see below (184 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 THEBE-LEADI STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=1154 1 1200 S NG -MAMA G see below (1237 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ THEBE-LEADING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A THEBE-LEADING 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 92.0 S THEBE-LEADING 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 92.0 S THEBE-LEADING 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1237.0 S -MAMA G 17727( 11) - 08-Dec-2025 21:25:16 - [ 9] Visit: 02 (ThebeTrail) Visit Requirements: BETWEEN 12-OCT-2024:00:00:00 AND 01-FEB-2025:00:00:00 On Hold Comments: Additional Comments: Identical to Visit 1 except the target is Thebe's trailing hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 THEBE-TRAIL STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) ING ------------------------------------------------------------------------------------------------------------------------------------ 2 THEBE-TRAIL STIS/CCD ACCUM 52X0.2E1 G430L 4300 SIZEAXIS2=80 1 110 S ING see below (184 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 THEBE-TRAIL STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=1154 1 1200 S ING -MAMA G see below (1237 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ THEBE-TRAILING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A THEBE-TRAILING 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 92.0 S THEBE-TRAILING 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 92.0 S THEBE-TRAILING 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1237.0 S -MAMA G 17727( 11) - 08-Dec-2025 21:25:16 - [ 10] Visit: 03 (AmaltheaLead) Visit Requirements: BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00 On Hold Comments: Additional Comments: 2 orbit visit to observe Amalthea's leading hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AMALTHEA-LE STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) ADING ------------------------------------------------------------------------------------------------------------------------------------ 2 AMALTHEA-LE STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=1080 1 1600 S ADING -MAMA G see below (1650 S) Comments: Buffer time is 4/5 of the value from the ETC calculation ------------------------------------------------------------------------------------------------------------------------------------ 3 AMALTHEA-LE STIS/CCD ACQ/PEA 52X0.05E1 MIRROR 1 1 S (1 S) ADING K ------------------------------------------------------------------------------------------------------------------------------------ 4 AMALTHEA-LE STIS/CCD ACCUM 52X0.05E1 G430L 4300 SIZEAXIS2=80 1 200 S PATTERN 1 4 ADING see below (690 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 AMALTHEA-LE STIS/CCD ACCUM 52X0.05E1 G750L 7751 SIZEAXIS2=80 1 50 S PATTERN 1 5 ADING see below (240 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.05 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-LEADING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AMALTHEA-LEADING 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1650.0 S -MAMA G AMALTHEA-LEADING 3 STIS/CCD ACQ/PEA 52X0.05E MIRROR none none none none 2 N/A K 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 1 2 115.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 2 2 115.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 1 2 115.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 2 2 115.0 S 1 17727( 11) - 08-Dec-2025 21:25:16 - [ 11] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 1 2 115.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 2 2 115.0 S 1 AMALTHEA-LEADING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 1 2 40.0 S 1 AMALTHEA-LEADING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 2 2 40.0 S 1 AMALTHEA-LEADING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 1 2 40.0 S 1 AMALTHEA-LEADING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 2 2 40.0 S 1 AMALTHEA-LEADING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 1 2 40.0 S 1 AMALTHEA-LEADING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 2 2 40.0 S 1 CCDFLAT 6 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 2 none 2 N/A 17727( 11) - 08-Dec-2025 21:25:16 - [ 12] Visit: 04 (AmaltheaTrail) Visit Requirements: BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00 On Hold Comments: Additional Comments: Identical to visit 3 but targeting Amalthea's trailing hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AMALTHEA-TR STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) AILING ------------------------------------------------------------------------------------------------------------------------------------ 2 AMALTHEA-TR STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=1080 1 1600 S AILING -MAMA G see below (1650 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AMALTHEA-TR STIS/CCD ACQ/PEA 52X0.05E1 MIRROR 1 1 S (1 S) AILING K ------------------------------------------------------------------------------------------------------------------------------------ 4 AMALTHEA-TR STIS/CCD ACCUM 52X0.05E1 G430L 4300 SIZEAXIS2=80 1 200 S PATTERN 1 4 AILING see below (690 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 AMALTHEA-TR STIS/CCD ACCUM 52X0.05E1 G750L 7751 SIZEAXIS2=80 1 50 S PATTERN 1 5 AILING see below (240 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.05 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-TRAILING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AMALTHEA-TRAILING 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1650.0 S -MAMA G AMALTHEA-TRAILING 3 STIS/CCD ACQ/PEA 52X0.05E MIRROR none none none none 2 N/A K 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 1 2 115.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 2 2 115.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 1 2 115.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 2 2 115.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 1 2 115.0 S 1 17727( 11) - 08-Dec-2025 21:25:16 - [ 13] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 2 2 115.0 S 1 AMALTHEA-TRAILING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 1 2 40.0 S 1 AMALTHEA-TRAILING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 2 2 40.0 S 1 AMALTHEA-TRAILING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 1 2 40.0 S 1 AMALTHEA-TRAILING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 2 2 40.0 S 1 AMALTHEA-TRAILING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 1 2 40.0 S 1 AMALTHEA-TRAILING 5 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 2 2 40.0 S 1 CCDFLAT 6 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 2 none 2 N/A 17727( 11) - 08-Dec-2025 21:25:16 - [ 14] Visit: 3A (AmaltheaLead) Visit Requirements: SCHED 100%; BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00 On Hold Comments: Additional Comments: 2 orbit visit to observe Amalthea's leading hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AMALTHEA-LE STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) ADING ------------------------------------------------------------------------------------------------------------------------------------ 2 AMALTHEA-LE STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=1080 1 1600 S ADING -MAMA G see below (1898 S) Comments: Buffer time is 4/5 of the value from the ETC calculation ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-LEADING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AMALTHEA-LEADING 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1898.0 S -MAMA G 17727( 11) - 08-Dec-2025 21:25:16 - [ 15] Visit: 3B (AmaltheaLead) Visit Requirements: SCHED 100%; BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00 On Hold Comments: Additional Comments: 2 orbit visit to observe Amalthea's leading hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AMALTHEA-LE STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) ADING ------------------------------------------------------------------------------------------------------------------------------------ 2 AMALTHEA-LE STIS/CCD ACQ/PEA 52X0.05E1 MIRROR 1 1 S (1 S) ADING K ------------------------------------------------------------------------------------------------------------------------------------ 3 AMALTHEA-LE STIS/CCD ACCUM 52X0.05E1 G430L 4300 SIZEAXIS2=80 1 200 S PATTERN 1 3 ADING see below (696 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AMALTHEA-LE STIS/CCD ACCUM 52X0.05E1 G750L 7751 SIZEAXIS2=80 1 50 S PATTERN 1 4 ADING see below (246 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X0.05 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-LEADING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AMALTHEA-LEADING 2 STIS/CCD ACQ/PEA 52X0.05E MIRROR none none none none 1 N/A K 1 AMALTHEA-LEADING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 1 1 116.0 S 1 AMALTHEA-LEADING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 2 1 116.0 S 1 AMALTHEA-LEADING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 1 1 116.0 S 1 AMALTHEA-LEADING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 2 1 116.0 S 1 AMALTHEA-LEADING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 1 1 116.0 S 1 AMALTHEA-LEADING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 2 1 116.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 1 1 41.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 2 1 41.0 S 1 17727( 11) - 08-Dec-2025 21:25:16 - [ 16] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 1 1 41.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 2 1 41.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 1 1 41.0 S 1 AMALTHEA-LEADING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 2 1 41.0 S 1 CCDFLAT 5 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 1 none 1 N/A CCDFLAT 5 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 2 none 1 N/A 17727( 11) - 08-Dec-2025 21:25:16 - [ 17] Visit: 4A (AmaltheaTrail) Visit Requirements: SCHED 100%; BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00 On Hold Comments: Additional Comments: Identical to visit 3 but targeting Amalthea's trailing hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AMALTHEA-TR STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) AILING ------------------------------------------------------------------------------------------------------------------------------------ 2 AMALTHEA-TR STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=1080 1 1600 S AILING -MAMA G see below (1898 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-TRAILING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AMALTHEA-TRAILING 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1898.0 S -MAMA G 17727( 11) - 08-Dec-2025 21:25:16 - [ 18] Visit: 4B (AmaltheaTrail) Visit Requirements: SCHED 100%; BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00 On Hold Comments: Additional Comments: Identical to visit 3 but targeting Amalthea's trailing hemisphere Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AMALTHEA-TR STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) AILING ------------------------------------------------------------------------------------------------------------------------------------ 2 AMALTHEA-TR STIS/CCD ACQ/PEA 52X0.05E1 MIRROR 1 1 S (1 S) AILING K ------------------------------------------------------------------------------------------------------------------------------------ 3 AMALTHEA-TR STIS/CCD ACCUM 52X0.05E1 G430L 4300 SIZEAXIS2=80 1 200 S PATTERN 1 3 AILING see below (696 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AMALTHEA-TR STIS/CCD ACCUM 52X0.05E1 G750L 7751 SIZEAXIS2=80 1 50 S PATTERN 1 4 AILING see below (246 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X0.05 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-TRAILING 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AMALTHEA-TRAILING 2 STIS/CCD ACQ/PEA 52X0.05E MIRROR none none none none 1 N/A K 1 AMALTHEA-TRAILING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 1 1 116.0 S 1 AMALTHEA-TRAILING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 1 none none 2 1 116.0 S 1 AMALTHEA-TRAILING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 1 1 116.0 S 1 AMALTHEA-TRAILING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 2 none none 2 1 116.0 S 1 AMALTHEA-TRAILING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 1 1 116.0 S 1 AMALTHEA-TRAILING 3 STIS/CCD ACCUM 52X0.05E G430L 4300 3 none none 2 1 116.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 1 1 41.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 1 none none 2 1 41.0 S 1 17727( 11) - 08-Dec-2025 21:25:16 - [ 19] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 1 1 41.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 2 none none 2 1 41.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 1 1 41.0 S 1 AMALTHEA-TRAILING 4 STIS/CCD ACCUM 52X0.05E G750L 7751 3 none none 2 1 41.0 S 1 CCDFLAT 5 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 1 none 1 N/A CCDFLAT 5 STIS/CCD ACCUM 52X0.05 G750L 7751 none none 2 none 1 N/A 17727( 11) - 08-Dec-2025 21:25:16 - [ 20] Summary Form for Proposal 17727 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.05, 52X0.05E1, 52X0.2, 52X0.2E1, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1080, BUFFER-TIME=1154, SIZEAXIS2=80 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 12-OCT-2024:00:00:00 AND 01-FEB-2025:00:00:00, BETWEEN 14-NOV-2025:00:00:00 AND 06-MAR-2026:00:00:00, PATTERN 1 3, PATTERN 1 4, PATTERN 1 5, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names AMALTHEA-LEADING, AMALTHEA-TRAILING, CCDFLAT, THEBE-LEADING, THEBE-TRAILING ------------------------------------------------------------------------------------------------------------------------------------