14930( 4) - 15-May-2017 14:49:51 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14930 Version: 4 Check-in Time: 15-May-2017 14:49:51 STScI Edit Number: 0 Title Coordinated HST and SOFIA observations of Europa's plumes ------------------------------------------------------------------------------------ Type Cycle GO/DD 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. William B. Sparks Space Telescope Science Institute Y CoI: Dr. Melissa A. McGrath SETI Institute N CoI: Dr. Kevin P. Hand Jet Propulsion Laboratory N CoI: Dr. John Grunsfeld NASA Goddard Space Flight Center N CoI: Dr. William Reach Universities Space Research Association N CoI: Dr. Matthew Richter University of California - Davis N ------------------------------------------------------------------------------------ Abstract The presence of plumes of water ice venting from the icy surface of Europa is of tremendous interest to the scientific community, NASA and the general public, as it offers the prospect of access to material that was once in Europa's ocean without the need to drill through miles of ice. With a proven method that has returned crucial scientific data, and garnered exceptional attention, we propose two additional HST observations of Europa as it transits the smooth face of Jupiter, to bracket upcoming observations on NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA), May 26, 2017. That program is deemed of strategic importance to SOFIA, and a special flight has been arranged to observe the crucial trailing hemisphere where the best plume candidate is to be found. In Sparks et al (2017) it was shown that the candidate has repeated and that it is coincident with a thermal anomaly, as might be expected by analogy with Enceladus. With high-resolution SOFIA mid-IR spectroscopy, we will seek water vapor directly, and esimate surface temperatures at longer wavelengths. Here, we propose to establish whether there is evidence of ongoing contemporaneous plume activity viewed in the FUV by bracketing the SOFIA observation as closely as the schedule allows, offering the prospect of fully validating the HST inference that there are active water plumes. If the ice plumes of Europa arise from the deep ocean, we have gained access to probably the most astrobiologically interesting location in the Solar System. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use the high resolution TIME-TAG FUV imaging mode of STIS, to obtain two images of Europa in transit against the face of Jupiter, timed to bracket an upcoming SOFIA observation. We will use the F25SRF2 filter and drift the image of Europa across the detector using moving target specifications to Level 3. Each image is a single visit, of maximum duration permitted by the orbit. ------------------------------------------------------------------------------------ 14930( 4) - 15-May-2017 14:49:51 - [ 2] TARGET LIST Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 TARGET NAME: EUROPA-TRANSIT-1 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE Satellite Europa ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER STD=EUROPA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS TYPE=POS_ANGLE, RAD=6.5, ANG=249.0, REF=NORTH, TRANSIT OF EUROPA ACROSS JUPITER FROM EARTH, R_RAD=-51., R_ANG=0, EPOCH=26-MAY-2017:03:56:50, SEP OF EUROPA JUPITER FROM EARTH LT -5" EpochTimeScale=UTC ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 5.3 +/- 0.5 Ephemeris Center: EARTH MOSS Show Windows: true ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 TARGET NAME: EUROPA-TRANSIT-2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE Satellite Europa ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 TARGET POSITION LEVEL 2 STD=JUPITER STD=EUROPA ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 WINDOWS TYPE=POS_ANGLE, RAD=6.5, ANG=231.0, REF=NORTH, TRANSIT OF EUROPA ACROSS JUPITER FROM EARTH, R_RAD=-51., R_ANG=0, EPOCH=12-JUN-2017:21:57:05, SEP OF EUROPA JUPITER FROM EARTH LT -5" EpochTimeScale=UTC ------------------------------------------------------------------------------------------------------------------------------------ DATA COMMENTS V = 5.3 +/- 0.5 Ephemeris Center: EARTH MOSS Show Windows: true ------------------------------------------------------------------------------------------------------------------------------------ 14930( 4) - 15-May-2017 14:49:51 - [ 3] Visit: 01 Visit Requirements: BETWEEN 25-MAY-2017:00:00:00 AND 28-MAY-2017:00:00:00 On Hold Comments: Additional Comments: 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-TRAN STIS/FUV TIME-TA F25SRF2 MIRROR BUFFER-TIME=99 1 2600 S SIT-1 -MAMA G (2600 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-TRANSIT-1 1 STIS/FUV TIME-TA F25SRF2 MIRROR none none none none 1 N/A -MAMA G 14930( 4) - 15-May-2017 14:49:51 - [ 4] Visit: 02 Visit Requirements: BETWEEN 11-JUN-2017:00:00:00 AND 13-JUN-2017:00:00:00 On Hold Comments: Additional Comments: 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-TRAN STIS/FUV TIME-TA F25SRF2 MIRROR BUFFER-TIME=99 1 2600 S SIT-2 -MAMA G (2600 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-TRANSIT-2 1 STIS/FUV TIME-TA F25SRF2 MIRROR none none none none 1 N/A -MAMA G 14930( 4) - 15-May-2017 14:49:51 - [ 5] Visit: 03 Visit Requirements: BETWEEN 12-JUN-2017:00:00:00 AND 13-JUN-2017:00:00:00 On Hold Comments: Additional Comments: This visit is set as a "buddy visit" to turn on the MAMA prior to the beginning of visit 02 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 DARK STIS/FUV ACCUM DEF DEF 1 1000 S -MAMA (1000 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 STIS/FUV ACCUM DEF DEF none none none none 1 N/A -MAMA 14930( 4) - 15-May-2017 14:49:51 - [ 6] Summary Form for Proposal 14930 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures DEF, F25SRF2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=99 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 11-JUN-2017:00:00:00 AND 13-JUN-2017:00:00:00, BETWEEN 12-JUN-2017:00:00:00 AND 13-JUN-2017:00:00:00, BETWEEN 25-MAY-2017:00:00:00 AND 28-MAY-2017:00:00:00 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names DARK, EUROPA-TRANSIT-1, EUROPA-TRANSIT-2 ------------------------------------------------------------------------------------------------------------------------------------