15848( 13) - 25-Aug-2021 18:28:54 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15848 Version: 13 Check-in Time: 25-Aug-2021 18:28:54 STScI Edit Number: 11 Title Confirming the Europa torus ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Lorenz Roth Royal Institute of Technology Y CoI: Dr. Howard Todd Smith The Johns Hopkins University Applied N Physics Laboratory CoI: Dr. Tracy M Becker Southwest Research Institute N CoI: Dr. Kurt David Retherford Southwest Research Institute N CoI: Dr. Joachim Saur Universitat zu Koeln N CoI: Dr. Nathaniel J. Cunningham Nebraska Wesleyan University N CoI: Dr. Nickolay Ivchenko Royal Institute of Technology N CoI: Dr. Aljona Bloecker Royal Institute of Technology N ------------------------------------------------------------------------------------ Abstract The proposed observations seek to directly measure for the first time the density of neutrals and plasma particles at the orbit of Jupiter's icy moon Europa. The existence of a neutral torus at Europa is only indirectly inferred by two independent observations. Yet, a Europa torus has never been confirmed observationally and the composition a torus would have is uncertain. UV spectra of the Europa environment taken by the Cassini spacecraft are much debated and lack the sensitivity to be conclusive. The high sensitivity and spectral range of COS uniquely enable us to measure the likely dominant neutral species near Europa's orbit, hydrogen and oxygen, and simultaneously three main Jovian ion species. If the proposed COS observations finally prove the existence of a Europa torus and constrain its constituent abundances, then they will also provide crucial insights into two poorly understood aspects of the system: (1) The mass loss from Europa's atmosphere, possibly including the role of plume activity, and (2), the balance between sustaining a neutral torus vs. generating a plasma torus in a moon orbit. If no emissions are detected at Europa's orbit, then the previous observations related to a Europa torus need to be revised and reinterpreted. ------------------------------------------------------------------------------------ Observations Description ------------------------ We observe the plasma and gas torus in Europa's orbit around Jupiter with 4 visits of 2 orbits each. The 4 visits should be executed as close in time as possible to avoid changes due to the time-variabilities in the Jupiter system. ------------------------------------------------------------------------------------ 15848( 13) - 25-Aug-2021 18:28:54 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: EUROPA-TORUS-A ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: TORUS Plasma and gas torus near Europa's orbit ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=TORUS, LONG=90, LAT=0, RAD=5.72e5, POLE_LONG=0, POLE_LAT=90 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF EUROPA-TORUS-A BY JUPITER FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-A BY IO FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-A BY EUROPA FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-A BY GANYMEDE FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-A BY CALLISTO FROM EARTH, SEP OF EUROPA-TORUS-A IO FROM EARTH GT 10", SEP OF EUROPA-TORUS-A EUROPA FROM EARTH GT 10", SEP OF EUROPA-TORUS-A GANYMEDE FROM EARTH GT 10", SEP OF EUROPA-TORUS-A CALLISTO FROM EARTH GT 10" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 0.0 +/- 0.0 This target is for the a torus with radius 8.0 Jovian radii, for probing between Io torus and Europa torus Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15848( 13) - 25-Aug-2021 18:28:54 - [ 3] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: EUROPA-TORUS-B ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: TORUS Plasma and gas torus near Europa's orbit ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=TORUS, LONG=90, LAT=0, RAD=6.29e5, POLE_LONG=0, POLE_LAT=90 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF EUROPA-TORUS-B BY JUPITER FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-B BY IO FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-B BY EUROPA FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-B BY GANYMEDE FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-B BY CALLISTO FROM EARTH, SEP OF EUROPA-TORUS-B IO FROM EARTH GT 10", SEP OF EUROPA-TORUS-B EUROPA FROM EARTH GT 10", SEP OF EUROPA-TORUS-B GANYMEDE FROM EARTH GT 10", SEP OF EUROPA-TORUS-B CALLISTO FROM EARTH GT 10" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 0.0 +/- 0.0 This target is for probing the torus region at radius 8.8 Jovian radii, inward of the peak Europa torus. Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15848( 13) - 25-Aug-2021 18:28:54 - [ 4] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 TARGET NAME: EUROPA-TORUS-C ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: TORUS Plasma and gas torus near Europa's orbit ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=TORUS, LONG=90, LAT=0, RAD=6.65e5, POLE_LONG=0, POLE_LAT=90 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF EUROPA-TORUS-C BY JUPITER FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-C BY IO FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-C BY EUROPA FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-C BY GANYMEDE FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-C BY CALLISTO FROM EARTH, SEP OF EUROPA-TORUS-C IO FROM EARTH GT 10", SEP OF EUROPA-TORUS-C EUROPA FROM EARTH GT 10", SEP OF EUROPA-TORUS-C GANYMEDE FROM EARTH GT 10", SEP OF EUROPA-TORUS-C CALLISTO FROM EARTH GT 10", OLG OF EUROPA BETWEEN 250 30 ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 0.0 +/- 0.0 This target aims at the expected peak location of the torus at 9.3 Jovian radii, slighly inward of Europa's orbit (which is at 9.38 R_J) Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15848( 13) - 25-Aug-2021 18:28:54 - [ 5] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 4 TARGET NAME: EUROPA-TORUS-D ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: TORUS Plasma and gas torus near Europa's orbit ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=TORUS, LONG=90, LAT=0, RAD=7.01e5, POLE_LONG=0, POLE_LAT=90 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF EUROPA-TORUS-D BY JUPITER FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-D BY IO FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-D BY EUROPA FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-D BY GANYMEDE FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-D BY CALLISTO FROM EARTH, SEP OF EUROPA-TORUS-D IO FROM EARTH GT 10", SEP OF EUROPA-TORUS-D EUROPA FROM EARTH GT 10", SEP OF EUROPA-TORUS-D GANYMEDE FROM EARTH GT 10", SEP OF EUROPA-TORUS-D CALLISTO FROM EARTH GT 10" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 0.0 +/- 0.0 This target is for probing the torus region at radius 9.8 Jovian radii, outward of the peak Europa torus Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15848( 13) - 25-Aug-2021 18:28:54 - [ 6] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 5 TARGET NAME: EUROPA-TORUS-E ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: TORUS Plasma and gas torus near Europa's orbit ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER TYPE=TORUS, LONG=90, LAT=0, RAD=8.94e5, POLE_LONG=0, POLE_LAT=90 ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS NOT OCC OF EUROPA-TORUS-E BY JUPITER FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-E BY IO FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-E BY EUROPA FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-E BY GANYMEDE FROM EARTH, NOT ECL P PARTIAL OF EUROPA-TORUS-E BY CALLISTO FROM EARTH, SEP OF EUROPA-TORUS-E IO FROM EARTH GT 10", SEP OF EUROPA-TORUS-E EUROPA FROM EARTH GT 10", SEP OF EUROPA-TORUS-E GANYMEDE FROM EARTH GT 10", SEP OF EUROPA-TORUS-E CALLISTO FROM EARTH GT 10" ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 0.0 +/- 0.0 This target is for probing the equatorial region outwards from the Europa torus at radial distance 12.5 Jovian radii, used for background Ephemeris Center: EARTH Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 15848( 13) - 25-Aug-2021 18:28:54 - [ 7] Visit: 01 Visit Requirements: SCHED 50%; BETWEEN 26-AUG-2020:12:50:00 AND 26-AUG-2020:13:50:00; SEQ 01, 02, 03, 04 WITHIN 19 H On Hold Comments: Additional Comments: First visit in a series of 4 visits, to be carried out as close in time as possible 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1000, 1 2700 S S-E G SEGMENT=BOTH see below (2611 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1000, 1 2700 S S-C G SEGMENT=BOTH see below (2699 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-E 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2611.0 S G EUROPA-TORUS-C 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2699.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 8] Visit: 02 Visit Requirements: SCHED 50%; BETWEEN 26-AUG-2020:17:40:00 AND 26-AUG-2020:18:40:00 On Hold Comments: Additional Comments: First visit in a series of 4 visits, to be carried out as close in time as possible 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1000, 1 2700 S S-B G SEGMENT=BOTH see below (2611 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1000, 1 2700 S S-D G SEGMENT=BOTH see below (2699 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-B 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2611.0 S G EUROPA-TORUS-D 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2699.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 9] Visit: 03 Visit Requirements: SCHED 50%; BETWEEN 26-AUG-2020:22:20:00 AND 26-AUG-2020:23:20:00 On Hold Comments: Additional Comments: First visit in a series of 4 visits, to be carried out as close in time as possible 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1000, 1 2700 S S-C G SEGMENT=BOTH see below (2611 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1000, 1 2700 S S-A G SEGMENT=BOTH see below (2699 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-C 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2611.0 S G EUROPA-TORUS-A 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2699.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 10] Visit: 04 Visit Requirements: SCHED 50%; BETWEEN 27-AUG-2020:03:07:00 AND 27-AUG-2020:04:07:00 On Hold Comments: Additional Comments: First visit in a series of 4 visits, to be carried out as close in time as possible 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1000, 1 2700 S S-C G SEGMENT=BOTH see below (2611 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1000, 1 2700 S S-E G SEGMENT=BOTH see below (2699 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-C 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2611.0 S G EUROPA-TORUS-E 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2699.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 11] Visit: 53 Visit Requirements: SCHED 50%; BETWEEN 07-SEP-2021:04:30:00 AND 07-SEP-2021:05:40:00 On Hold Comments: Additional Comments: HOPR repeat of visit 03. 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1000, 1 2700 S S-C G SEGMENT=BOTH see below (2153 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-C 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2153.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 12] Visit: 54 Visit Requirements: SCHED 50%; BETWEEN 07-SEP-2021:07:45:00 AND 07-SEP-2021:08:30:00 On Hold Comments: Additional Comments: HOPR repeat of visit 04. 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=1000, 1 2700 S S-C G SEGMENT=BOTH see below (2153 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1000, 1 2700 S S-E G SEGMENT=BOTH see below (2154 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-C 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2153.0 S G EUROPA-TORUS-E 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2154.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 13] Visit: 55 Visit Requirements: SCHED 50%; BETWEEN 07-SEP-2021:06:00:00 AND 07-SEP-2021:07:00:00 On Hold Comments: Additional Comments: HOPR repeat of visit 03. 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 EUROPA-TORU COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=1000, 1 2700 S S-A G SEGMENT=BOTH see below (2153 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 | ------------------------------------------------------------------------------------------------------------------------------------ EUROPA-TORUS-A 1 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2153.0 S G 15848( 13) - 25-Aug-2021 18:28:54 - [ 14] Summary Form for Proposal 15848 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1000, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 07-SEP-2021:04:30:00 AND 07-SEP-2021:05:40:00, BETWEEN 07-SEP-2021:06:00:00 AND 07-SEP-2021:07:00:00, BETWEEN 07-SEP-2021:07:45:00 AND 07-SEP-2021:08:30:00, BETWEEN 26-AUG-2020:12:50:00 AND 26-AUG-2020:13:50:00, BETWEEN 26-AUG-2020:17:40:00 AND 26-AUG-2020:18:40:00, BETWEEN 26-AUG-2020:22:20:00 AND 26-AUG-2020:23:20:00, BETWEEN 27-AUG-2020:03:07:00 AND 27-AUG-2020:04:07:00, SCHED 50%, SEQ 01, 02, 03, 04 WITHIN 19 H ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M ------------------------------------------------------------------------------------------------------------------------------------ Target Names EUROPA-TORUS-A, EUROPA-TORUS-B, EUROPA-TORUS-C, EUROPA-TORUS-D, EUROPA-TORUS-E ------------------------------------------------------------------------------------------------------------------------------------