Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5392 Report Date: 18-Jul-95:17:17 Version: ********** Check-in Date: ********** 1.Proposal Title: MAPPING IO'S SURFACE AND VOLCANIC ACTIVITY: CYCLE 4 MEDIUM ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID SOLAR SYSTEM GO Sub Category SATELLITES ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone John R. Spencer 2540 USA (602) 774-3358 ------------------------------------------------------------------------------------ 7. Abstract We will obtain global coverage of Io with the PC at four longitudes in five filters from 0.35 to 1 micron, to characterize global changes since Voyager and before Galileo and to investigate the unknown reflectance of individual surface units beyond 0.6 microns. We will obtain more detailed 3500 A images with the FOC of the regions to be seen in closeup by Galileo, and to look for plumes off the limb of Io, and will obtain a single long-exposure 1 micron PC image of Io in eclipse to observe thermal emission from volcanic materials at 1000 K or hotter. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.22 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOC WF/PC ------------------------------------------------------------------------------------ 12. Special sched req: Time Critical obs. Real Time obs. ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5392 PI: John R. Spencer Proposal Title: MAPPING IO'S SURFACE AND VOLCANIC ACTIVITY: CYCLE 4 MEDIUM ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ John R. Spencer 2540 USA Melissa Mcgrath 3470 USA Alfred S. Mcewen 3600 USA Paola Sartoretti 3470 USA Torrence V. Johnson 2370 USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. 1) Imaging of selected plumes and the anti-Jovian hemisphere of Io with the "f96" FOC at 3500 A. We need three pairs of exposures in the F346M filter (with F8ND to provide appropriate count rates). Observations should be made as close as possible before or after the 1994 opposition (on May 1st) to maximise Io's angular diameter. Exposures will be at orbital longitudes 65, 160, and 210, with usual tolerance of +/- 8 degrees (+/- 1 hour) so plumes are close to the limb. Paired 10-m exposures will reduce rotational smear. 2) Global imaging with the PC at four longitudes in the F336W, F410M, F569W, F791W, and F1042M filters. Observations should be made as close as possible before or after the 1994 opposition (on May 1st) to maximise Io's angular diameter. Orbital longitudes should be 45, 135, 225, and 315, with a tolerance of +/- 15 degrees (+/- 1.8 hours). 3) One 15 minute PC exposure of Io in Jupiter eclipse with the F1042M filter to look for sites of high-temperature volcanic thermal emission. Eclipses occur every 1.8 days and last for a maximum of 70 minutes before or after Jupiter occultation. The observation is best made between 1.5 and 4.5 months before or after opposition, when the visible duration of eclipses is greatest. Observations can also be made during the 1995 Jupiter apparition, but 1994 is preferred so that we can look for longer-timescale changes when we compare to the December 1995 Galileo Io images, and to give adequate lead time for any Galileo targeting decisions that may be based on the HST images. Page 3 ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. Io's small angular diameter (maximum 1.2 arcsec) makes study of surface albedo markings almost impossible from the ground: HST is our only pre-Galileo option. Useful spatial resolution of volcanic hot spots can be achieved in the 3-5 micron region, because of their extremely high contrast and point-source nature. However, even for hot spot studies, the best spatial resolution of about 0.3 arcseconds is much poorer than the c. 0.05 arcsecond resolution achievable with the HST PC at 1 micron, and it is difficult to locate hot spots from the ground with enough precision for close-range Galileo targeting support. Ground-based Jupiter occultation lightcurves give hot spot locations with a precision of about 150 km, but only in one dimension. The greater point-source sensitivity of HST also increases the chances of seeing 1 micron thermal emission, which has not been detected from the ground. Most of the observations we propose can be repeated by the Galileo spacecraft between December 1995 and late 1997, but the HST observations are important because: (i) They extend the time coverage of spatially-resolved observations, providing a "history" for the features seen by Galileo. (ii) They allow evaluation of possible observational techniques for Galileo, (1 micron hot spot imaging in darkness, and sunlit imaging at wavelengths longer than 0.6 microns) so that most efficient use is made of Galileo's budget of returned data, which will be severely limited if the high- gain antenna does not open. (iii) They can provide the most up-to-date possible picture of active and interesting regions on Io, so that these regions can be targeted for high-resolution observations by Galileo. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. Real-time acquisition is required for the FOC images for bright object protection. The observations are time-critical as specific Io longitudes must be observed. The eclipse observation is possible during a 30-minute time window every Io orbit, or every 1.77 days, but must be done away from opposition so that Io is visible in Jupiter's shadow. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. None. If necessary, the filters can be calibrated using the sunlit images of Io and Io's known disk-integrated magnitude. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. ------------------------------------------------------------------------------------ 9. Description of previous HST work. program numbers, titles, present authors: GO2627, Io's Atmosphere and its Interaction with the Plasma Torus (McGrath, Co-I). GO4353, HST Imaging of Io, (McGrath: PI, Spencer, McEwen, Sartoretti, co-Is). GO4600, McGrath, co-I. GO3616, The Upper Atmospheres of Uranus and Neptune, McGrath, co-I. GO2602 - The Excitation of the Atmospheres of Planetary Satellites, McGrath, co-I. GO3862 - The Excitation of the Atmospheres of Planetary Satellites, McGrath, co-I. GTO 1269 - Far UV Observations of the Giant Planets, McGrath, co-I. Relation to current proposal Proposals GO 2627, 4253, 2602, 3862, and GTO 1269 are related to this proposal. \headsecond Publications from Previous HST data "Detection of [OII] 2471 from the Io Plasma Torus", McGrath et al., submitted to ApJ Lett, March 1993. "Disk-Resolved Imaging of Io with the Hubble Space Telescope", P. Sartoretti, M. A. McGrath, and F. Paresce, submitted to Icarus, May 1993. "Detection of Io's SO2 Atmosphere with the Hubble Space Telescope", McGrath et al., to be submitted to Icarus, May 1993. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Existing computer facilities and image processing software are available for data analysis at STScI, Lowell Observatory and the U.S. Geological Survey in Flagstaff. Page 4 ------------------------------------------------------------------------------------ 11. Address Information Name: John R. Spencer Category: PI Institution: 2540 Address: Lowell Observatory 1400 W. Mars Hill Rd. City: Flagstaff State: AZ Zip Code: 86001 Country: USA Telephone: (602) 774-3358 Telex (or e-mail): spencer@lowell.edu ------------------------------------------------------------------------------------ Name: Category: CON Institution: Address: City: State: Zip Code: Country: Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 5392 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 | TARGET NAME: IO-LON-045 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | CML OF IO FROM EARTH BETWEEN 30 60 | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 45 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | SURFACE BRIGHTNESSES ARE FOR 3 |SURF(4100) = 2.7 +/- 0.4 E -11 | BRIGHTEST REGIONS OF SURFACE AS 4 |SURF(5600) = 4.3 +/- 0.6 E -11 | CLOSE TO OPPOSITION AS POSSIBLE FOR 5 |SURF(7800) = 2.9 +/- 0.4 E -11 | BEST SPATIAL RESOLUTION 6 |SURF(10200) = 1.9 +/- 0.3 E -11 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 | TARGET NAME: IO-LON-135 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | CML OF IO FROM EARTH BETWEEN 120 150 | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 135 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | SURFACE BRIGHTNESSES ARE FOR 3 |SURF(4100) = 2.7 +/- 0.4 E -11 | BRIGHTEST REGIONS OF SURFACE AS 4 |SURF(5600) = 4.3 +/- 0.6 E -11 | CLOSE TO OPPOSITION AS POSSIBLE FOR 5 |SURF(7800) = 2.9 +/- 0.4 E -11 | BEST SPATIAL RESOLUTION 6 |SURF(10200) = 1.9 +/- 0.3 E -11 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 5392 [ 6] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 | TARGET NAME: IO-LON-225 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | CML OF IO FROM EARTH BETWEEN 210 240 | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 225 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | SURFACE BRIGHTNESSES ARE FOR 3 |SURF(4100) = 2.7 +/- 0.4 E -11 | BRIGHTEST REGIONS OF SURFACE AS 4 |SURF(5600) = 4.3 +/- 0.6 E -11 | CLOSE TO OPPOSITION AS POSSIBLE FOR 5 |SURF(7800) = 2.9 +/- 0.4 E -11 | BEST SPATIAL RESOLUTION 6 |SURF(10200) = 1.9 +/- 0.3 E -11 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 4 | TARGET NAME: IO-LON-315 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | CML OF IO FROM EARTH BETWEEN 300 330 | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 315 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | SURFACE BRIGHTNESSES ARE FOR 3 |SURF(4100) = 2.7 +/- 0.4 E -11 | BRIGHTEST REGIONS OF SURFACE AS 4 |SURF(5600) = 4.3 +/- 0.6 E -11 | CLOSE TO OPPOSITION AS POSSIBLE FOR 5 |SURF(7800) = 2.9 +/- 0.4 E -11 | BEST SPATIAL RESOLUTION 6 |SURF(10200) = 1.9 +/- 0.3 E -11 | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 5392 [ 7] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 5 | TARGET NAME: IO-BLANK-210 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | TYPE = POS_ANGLE, | CML OF IO FROM EARTH BETWEEN 199 221 REF = NORTH, | RAD = 30, | ANG = 15 | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 210 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | SMALL LONGITUDE RANGE ALLOWED AS | | NEED PLUMES ON LIMB AS CLOSE TO | | OPPOSITION AS POSSIBLE FOR BEST | | SPATIAL RESOLUTION POSITION OFFSET | | FROM IO FOR FOC BRIGHT-OBJECT | | PROTECTION APPROX PERPENDICULAR TO | | JUPITER EQUATORIAL PLANE | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 6 | TARGET NAME: IO-BLANK-160 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | TYPE = POS_ANGLE, | CML OF IO FROM EARTH BETWEEN 145 175 REF = NORTH, | RAD = 30, | ANG = 15 | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 160 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | LARGER LONGITUDE RANGE ALLOWED AS | | PELE PLUME IS BIG AS CLOSE TO | | OPPOSITION AS POSSIBLE FOR BEST | | SPATIAL RESOLUTION POSITION OFFSET | | FROM IO FOR FOC BRIGHT-OBJECT | | PROTECTION APPROX PERPENDICULAR TO | | JUPITER EQUATORIAL PLANE | ------------------------------------------------------------------------------------------------------------------------------------ TARGET LIST b)Solar System Targets ID = 5392 [ 8] ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 7 | TARGET NAME: IO-BLANK-065 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD = IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | TYPE = POS_ANGLE, | CML OF IO FROM EARTH BETWEEN 54 76 REF = NORTH, | RAD = 30, | ANG = 15 | | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 5.4 +/- 0.15 | IO CENTER NEAR 65 DEGREE LONGITUDE 2 |SURF(3400) = 8 +/- 2 E -12 | SMALL LONGITUDE RANGE ALLOWED AS | | NEED PLUMES ON LIMB AS CLOSE TO | | OPPOSITION AS POSSIBLE FOR BEST | | SPATIAL RESOLUTION POSITION OFFSET | | FROM IO FOR FOC BRIGHT-OBJECT | | PROTECTION APPROX PERPENDICULAR TO | | JUPITER EQUATORIAL PLANE | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 9 | TARGET NAME: IO-ECLIPSED ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE IO ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD=JUPITER | STD=IO | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ECL U OF IO BY JUPITER | SEP OF JUPITER IO FROM EARTH GT 10 " | ------------------------------------------------------------------------------------------------------------------------------------ REF | DATA | COMMENTS | | 1 |SURF(V) = 18 +/- 2 | IO IN JUPITER UMBRAL ECLIPSE 2 |F(10500) = 3 +/- 2 E -17 | THROUGHOUT EXPOSURE MORE THAN 12 | | ARCSEC FROM JUPITER LIMB FRAME EDGE | | BISECTING LINE BETWEEN IO AND | | JUPITER LIMB: SEE EXPOSURE LOG LINE | | 16 | ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5392 [ 9] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DEFINE # WFPC2 IMAGE PC1 F336W ATD-GAIN=15 1 23S 150 2 # CYCLE 4 CYCFILT GROUP 1,2,3,4,5 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 2 DEFINE # WFPC2 IMAGE PC1 F410M ATD-GAIN=15 1 10S 150 3 # CYCLE 4 CYCFILT GROUP 1,2,3,4,5 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 3 DEFINE # WFPC2 IMAGE PC1 F569W ATD-GAIN=15 1 0.3S 150 4 # CYCLE 4 CYCFILT GROUP 1,2,3,4,5 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 4 DEFINE # WFPC2 IMAGE PC1 F791W ATD-GAIN=15 1 0.23S 150 5 # CYCLE 4 CYCFILT GROUP 1,2,3,4,5 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 5 DEFINE # WFPC2 IMAGE PC1 F1042M ATD-GAIN=15 1 20S 150 6 # CYCLE 4 CYCFILT GROUP 1,2,3,4,5 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 6 USE IO-LON-045 5 CYCLE 4 CYCFILT ------------------------------------------------------------------------------------------------------------------------------------ 7 USE IO-LON-135 5 CYCLE 4 CYCFILT ------------------------------------------------------------------------------------------------------------------------------------ 8 USE IO-LON-225 5 CYCLE 4 CYCFILT ------------------------------------------------------------------------------------------------------------------------------------ 9 USE IO-LON-315 5 CYCLE 4 CYCFILT ------------------------------------------------------------------------------------------------------------------------------------ 10 DARK FOC/96 IMAGE 512X512 F346M, 1 17S 1 2 2 CYCLE 4 F8ND SEQ 10-11 NON-INT Comments: DARK FRAME FOR BRIGHT OBJECT PROTECTION ------------------------------------------------------------------------------------------------------------------------------------ 11 IO-BLANK- FOC/96 IMAGE 512X512 F346M, 2 10M 20 2 2 CYCLE 4 210 F8ND 20M REQ UPLINK Comments: MANUAL SLEW TO IO EXPECTED IF FILTERS OK IN LINE 10 TWO EXPOSURES TO REDUCE ROTATIONAL SMEAR ------------------------------------------------------------------------------------------------------------------------------------ 12 DARK FOC/96 IMAGE 512X512 F346M, 1 17S 1 2 1 CYCLE 4 F8ND SEQ 12-13 NON-INT Comments: DARK FRAME FOR BRIGHT OBJECT PROTECTION ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5392 [ 10] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 13 IO-BLANK- FOC/96 IMAGE 512X512 F346M, 2 10M 20 2 1 CYCLE 4 160 F8ND 20M REQ UPLINK Comments: MANUAL SLEW TO IO EXPECTED IF FILTERS OK IN LINE 12 TWO EXPOSURES TO REDUCE ROTATIONAL SMEAR ------------------------------------------------------------------------------------------------------------------------------------ 14 DARK FOC/96 IMAGE 512X512 F346M, 1 17S 1 2 3 CYCLE 4 F8ND SEQ 14-15 NON-INT Comments: DARK FRAME FOR BRIGHT OBJECT PROTECTION ------------------------------------------------------------------------------------------------------------------------------------ 15 IO-BLANK- FOC/96 IMAGE 512X512 F346M, 2 10M 20 2 3 CYCLE 4 065 F8ND 20M REQ UPLINK Comments: MANUAL SLEW TO IO EXPECTED IF FILTERS OK IN LINE 14 TWO EXPOSURES TO REDUCE ROTATIONAL SMEAR ------------------------------------------------------------------------------------------------------------------------------------ 16 IO-ECLIPSED WFPC2 IMAGE PC1 F1042M 1 15M 5 2 8 CYCLE 4 POS TARG -13,-13 Comments: NEED TO KEEP JUPITER OFF PC1 CHIP POS TARG SPECIFICATION WILL DO THIS ASSUMING V3 AXIS POINTS AT SUN ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5392 [ 11] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 FOC/96 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ATD-GAIN=15 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.22 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category SOLAR SYSTEM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category SATELLITES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 4; GROUP 1,2,3,4,5 NO GAP SEQ 10-11 NON-INT; REQ UPLINK; SEQ 12-13 NON-INT; SEQ 14-15 NON-INT; POS TARG -13,-13 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W F410M F569W F791W F1042M F346M,F8ND ------------------------------------------------------------------------------------------------------------------------------------ Target Names IO-LON-045 IO-LON-135 IO-LON-225 IO-LON-315 IO-BLANK-210 IO-BLANK-160 IO-BLANK-065 IO-ECLIPSED ------------------------------------------------------------------------------------------------------------------------------------