5824( 22) - 12/08/95 10:16 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5824 Version: 22 Check-in Date: ********** 1.Proposal Title: Occultation of GSC5249-01240 by Saturn: Atmospheric and Ring Studies ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Solar System GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Amanda S. Bosh Lowell Observatory CoI: Prof. James L. Elliot Massachusetts Institute of Technology N ------------------------------------------------------------------------------------ 6. Abstract On 1995 November 20-21, Saturn and its rings will occult GSC5249-01240 while Saturn is near its stationary point. This will result in probes of the atmosphere at multiple latitudes and of the rings at several longitudes. We propose to observe this event to (i) establish Saturn's atmospheric structure in the 1-100 microbar region (inaccessible to Voyager instruments), (ii) determine the extent of latitudinal homogeneity in composition and temperature present near north latitudes 35-75 degrees, and (iii) probe the ring system for features of low optical depth (with spatial resolution better than 1 km) by taking advantage of the low opening angle of the rings as we approach ring-plane crossing in 1995. ------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 2] Observations Description ------------------------ (1) More than 12 hours before or after the occultation observations, obtain spectrum of star with the G650L/BL element (to be used during the occultation observations). This determines the spectrum of the star for later use in data analysis. (2) One orbit before, or in same orbit as the start of the occultation observations, acquire an "offset- acquisition" star: one that is within 1.5 arcmin of the star to be occulted but further from Saturn and its rings than the target star. This offset acquisition technique has been successfully implemented before (GTO/HSP1081, and others) to avoid problems with target acquisition in the bright scattered light background near Saturn. A suitable offset acquisition candidate will be chosen after ground-based astrometric frames are obtained and analyzed. (3) Blind offset to GSC5249- 01240. Prior astrometry will have determined the relative positions of these two stars to better than 0.1 arcsec, assuring accurate placement of the target star in the science aperture. (4) Track on GSC5249-01240 while Saturn's atmosphere passes in front of it (7-8 orbits). There will be one atmosphere observation per orbit, each lasting about 15 minutes. (5) Approximately 10 orbits between the time the star exits the atmosphere and it enters the rings. During this time, can obtain spectra of Saturn's atmosphere (near occultation latitudes) and rings. This can also be done after ring egress or before ingress of the atmosphere portion of the occultation. These observations establish the spectra of Saturn's atmosphere and rings separately, without any stellar component. These will be used in later analyses. (6) One orbit before, or in the same orbit as the start of the ring occultation observations, acquire offset-acq star. (7) Blind offset to GSC5249-01240. (8) Track on GSC5249- 01240 while Saturn's rings pass in front of it (4-5 orbits). There will be one ring observation per orbit, each lasting as long as possible (<2*18 minutes, utilizing both tape recorders at the risk of losing data). (9) If atmospheric and ring spectra were not previously obtained, get them now. The quantity of data obtained in this set of observations may pose a problem. If possible, the tape recorder(s) should be downloaded during the earth-occultation portion of each orbit. If this is not possible, we will need to sacrifice some orbits to relay the previously obtained data. This will reduce the total number of orbits used for this proposal. This will reduce the latitudinal coverage of the atmosphere occultation, and the multiple passes through the rings. While it is not desirable, and the scientific return goes down in direct proportion to the number of lost orbits, we will retain adequate coverage due to the nature of the stellar path. Cycle 5: Primary Orbits: 16 Exposures: 27 Real Time Justification ----------------------- Time-critical: stellar occultations by solar system bodies are inherently time -critical observations. They occur at a particular time, determined by the planetary ephemeris and star position; therefore, no other dates/times are acceptable. In addition, this particular event is truly rare and time-critical because it occurs near Saturn's stationary point (the point when the Earth's motion and Saturn's motion, projected onto the sky plane, are almost equal and opposite, making Saturn appear to be stationary). It is very unusual for a planet to occult a star near a stationary point (statistically, because it is a relatively small area of sky), but these are the most useful observations because the planet is moving slowly, allowing us to increase our S/N and spatial resolution. We plan to apply for observing time at a ground-based station (such as the Infrared Telescope Facility at Mauna Kea, Hawaii). While the S/N and resolution from such a site will be greatly inferior to that from the HST, additional observations will aid in constraining the geometry of the event (determining the ephemeris offsets f_0, g_0 are a crucial part of the analysis), and may also provide additional data points for studying ringlet kinematics. We will also provide ground-based astrometry prior to the event. With this astrometry we will locate an offset acquisition target and determine its position relative to GSC5249-01240 with an accuracy of better than 0.1 arcsec. We will also use this astrometry to refine the predicted times of feature events. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: OVERNIGHT Email: , ------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GSC5249- STAR RA=23H 19M 34.5755S +/- 0.003S, J2000 V=11.6 +/- 0.5 01240 DEC=-6D 47' 10.042" +/- 0.05" 5824( 22) - 12/08/95 10:16 - [ 5] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 | TARGET NAME: SATURN-ATMOS1 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: OTHER, LIMB OF SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = POS_ANGLE, RAD = 8.36, ANG = | 349.14, REF = NORTH | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 6.7 +/- 0.5 | Saturn's atmosphere along apparent | path of occulted star, immersion | section. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 4 | TARGET NAME: SATURN-ATMOS2 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: OTHER, LIMB OF SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = POS_ANGLE, RAD = 9.14, ANG = | 80.94, REF = NORTH | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 6.7 +/- 0.5 | Saturn's atmosphere along apparent | path of occulted star, emersion | section. | ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 6] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 5 | TARGET NAME: SATURN-RING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: RING SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = POS_ANGLE, RAD = 11.11, ANG = | 94.65, REF = NORTH | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 10.0 +/- 0.5 | Saturn's rings along apparent path | of occulted star. Saturn's ring will | be much fainter than usual because | of the sun crossing through the ring | plane. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 6 | TARGET NAME: TETHYS ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: SATELLITE TETHYS ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | STD = TETHYS | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | V = 10.2 +/- 0.5 | Rhea, offset acq for SATURN-ATMOS1 | and SATURN-ATMOS2. | ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 7] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 20 | TARGET NAME: SATURN-EAST-ANSA ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: RING SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = TORUS, LONG = 270, LAT = 0, RAD = | 1.37E05, POLE_LAT = +90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 15.0 B-V = 0.65 | Eastern ansa of Saturn rings | centered on outer edge of the A | ring. Flux is edge-on ring | brightness per LINEAR arcsecond. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 30 | TARGET NAME: SATURN-WEST-ANSA ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: RING SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = TORUS, LONG = 90, LAT = 0, RAD = | 1.37E05, POLE_LAT = +90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 15.0 B-V = 0.65 | Western ansa of Saturn rings | centered on outer edge of the A | ring. Flux is edge-on brightness per | LINEAR arcsecond. | ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 8] Visit: 01 Visit Requirements: PCS MODE Fine BETWEEN 13-NOV-95:00:00:00 and 19-NOV-95:00:00:00 On Hold Comments: Additional Comments: ATMOS-OCC. Fine lock if possible; if not, coarse track is acceptable. Timing of this visit may change in response to updated astrometry and revised occultation prediction. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 GSC5249- FOS/RD ACQ/PEA 4.3 G400H SEARCH-SIZE- 1 1S ONBOARD ACQ FOR 20 01240 K X=1, SEARCH- SIZE-Y=3, SCAN- STEP-Y=1.23 ------------------------------------------------------------------------------------------------------------------------------------ 20 GSC5249- FOS/RD ACQ/PEA 1.0 G400H SEARCH-SIZE- 1 1S ONBOARD ACQ FOR 30 01240 K X=6, SEARCH- SIZE-Y=2, SCAN- STEP-X=0.61, SCAN-STEP- Comments: Y=0.61 ------------------------------------------------------------------------------------------------------------------------------------ 30 GSC5249- FOS/RD ACQ/PEA 0.3 G400H SEARCH-SIZE- 1 1S ONBOARD ACQ FOR 40 01240 K X=5, SEARCH- SIZE-Y=5, SCAN- STEP-X=0.17, SCAN-STEP- Comments: Y=0.17 ------------------------------------------------------------------------------------------------------------------------------------ 40 GSC5249- FOS/RD ACQ/PEA 0.3 G400H SEARCH-SIZE- 1 1S ONBOARD ACQ FOR 420-450 01240 K X=5, SEARCH- SIZE-Y=5, SCAN- STEP-X=0.052, SCAN-STEP- Comments: SAVE OFFSET RPC-1 Y=0.052 ------------------------------------------------------------------------------------------------------------------------------------ 420 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 120.54S 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: Get spectrum of occulted star when it is away from Saturn. Same parameters as occultation. ------------------------------------------------------------------------------------------------------------------------------------ 430 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 4.0 1 120S 01240 Comments: Get spectrum of occulted star when it is away from Saturn. Parameters set to optimize signal, calibration ability. Standard RAPID mode parameters. ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 9] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 440 GSC5249- FOS/RD RAPID 1.0 G650L READ-TIME = 1 120.54S 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: Get spectrum of occulted star when it is away from Saturn. Same parameters as occultation. ------------------------------------------------------------------------------------------------------------------------------------ 450 GSC5249- FOS/RD RAPID 1.0 G650L READ-TIME = 4.0 1 120S 01240 Comments: Get spectrum of occulted star when it is away from Saturn. Parameters set to optimize signal, calibration ability. Standard RAPID mode parameters. ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 10] Visit: 02 Visit Requirements: PCS MODE Fine BETWEEN 20-NOV-95:00:00:00 and 20-NOV-95:01:00:00 On Hold Comments: Additional Comments: ATMOS-OCC. Fine lock if possible; if not, coarse track is acceptable. Timing of this visit may change in response to updated astrometry and revised occultation prediction. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 90 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1080S 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. The SEQ NON-INT can be removed. GROUP 30-90 NO GAP. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 95 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1080S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. The SEQ NON-INT can be removed. GROUP 30-90 NO GAP. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 100 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1395S RT ANALYSIS END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 110 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1740S RT ANALYSIS END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 11] Visit: 03 Visit Requirements: PCS MODE Fine BETWEEN 20-NOV-95:18:00 AND 20-NOV-95:19:00 On Hold Comments: Additional Comments: ATM & RING-OCC. Fine lock if possible; if not, coarse track is acceptable. Timing of this visit may change in response to updated astrometry and revised occultation prediction. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 220 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 510S 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 225 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1080S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 230 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 480S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 235 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1080S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 240 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1080S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 12] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 250 GSC5249- FOS/RD RAPID 1.0 G400H READ-TIME = 1 1080S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 260 GSC5249- FOS/RD RAPID 1.0 G650L READ-TIME = 1 1275S RT ANALYSIS END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 265 GSC5249- FOS/RD RAPID 1.0 G650L READ-TIME = 1 720S END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 270 GSC5249- FOS/RD RAPID 1.0 G650L READ-TIME = 1 2235S RT ANALYSIS NO SPLIT END ORBIT 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 280 GSC5249- FOS/RD RAPID 1.0 G650L READ-TIME = 1 810S 01240 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: IGNORE SAA. Can split exposure across SAA. USE OFFSET RPC-1 ------------------------------------------------------------------------------------------------------------------------------------ 301 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=no 1 180S POS TARG -0.3, -0.2 NO SPLIT SEQ 301-302 -ANSA NON-INT Comments: PC image of shadows on rings (east ansa) ------------------------------------------------------------------------------------------------------------------------------------ 302 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=no 1 180S POS TARG -1.7, -7.8 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa) ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 13] Visit: 04 Visit Requirements: PCS MODE Fine On Hold Comments: Additional Comments: BACK-SCANS. Fine lock if possible; if not, coarse track is acceptable. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 300 TETHYS FOS/RD ACQ/PEA 4.3 G400H SCAN-STEP-Y = 1 1S ONBOARD ACQ FOR 310 K 1.23, SEARCH- SIZE-X = 1, SEARCH-SIZE-Y = 3 ------------------------------------------------------------------------------------------------------------------------------------ 310 TETHYS FOS/RD ACQ/PEA 1.0 G400H SCAN-STEP-X = 1 1S ONBOARD ACQ FOR 320 K 0.61, SCAN-STEP -Y = 0.61, SEARCH-SIZE-X = 6, SEARCH-SIZE- Comments: Y = 2 ------------------------------------------------------------------------------------------------------------------------------------ 320 TETHYS FOS/RD ACQ/PEA 0.5 G400H SCAN-STEP-X = 1 1S ONBOARD ACQ FOR 330-380 K 0.29, SCAN-STEP -Y = 0.29, SEARCH-SIZE-X = 3, SEARCH-SIZE- Comments: Using Peak acquisition to achieve 0.1 arcsec Y = 3 pointing accuracy (sequence A+B1+C1 from CAL/FOS-132). ------------------------------------------------------------------------------------------------------------------------------------ 330 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 1 SEQ 330-340 NON-INT ATMOS1 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 340 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 2 ATMOS1 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 350 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 3 SEQ 350-360 NON-INT ATMOS2 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 360 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 4 ATMOS2 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 14] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 370 SATURN-RING FOS/RD RAPID 1.0 G650L READ-TIME = 1 40.18S SPATIAL SCAN 5 SEQ 370-380 NON-INT 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: Warning: this scan occurs very near Saturn's limb, which is too bright for the G650L disperser used here. ------------------------------------------------------------------------------------------------------------------------------------ 380 SATURN-RING FOS/RD RAPID 1.0 G650L READ-TIME = 1 40.18S SPATIAL SCAN 6 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: Warning: this scan occurs very near Saturn's limb, which is too bright for the G650L disperser used here. ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 15] Visit: 05 Visit Requirements: PCS MODE Fine On Hold Comments: Additional Comments: Additional WFPC images Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 501 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=no 2 400S NO SPLIT -ANSA Comments: PC image of shadows on rings (east ansa) ------------------------------------------------------------------------------------------------------------------------------------ 502 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=no 2 400S POS TARG -1.7, -7.8 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa) ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 16] Visit: 06 Visit Requirements: PCS MODE Fine On Hold Comments: Additional Comments: BACK-SCANS. Fine lock if possible; if not, coarse track is acceptable. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 300 TETHYS FOS/RD ACQ/PEA 4.3 G400H SCAN-STEP-Y = 1 1S ONBOARD ACQ FOR 310 K 1.23, SEARCH- SIZE-X = 1, SEARCH-SIZE-Y = 3 ------------------------------------------------------------------------------------------------------------------------------------ 310 TETHYS FOS/RD ACQ/PEA 1.0 G400H SCAN-STEP-X = 1 1S ONBOARD ACQ FOR 320 K 0.61, SCAN-STEP -Y = 0.61, SEARCH-SIZE-X = 6, SEARCH-SIZE- Comments: Y = 2 ------------------------------------------------------------------------------------------------------------------------------------ 320 TETHYS FOS/RD ACQ/PEA 0.5 G400H SCAN-STEP-X = 1 1S ONBOARD ACQ FOR 330-380 K 0.29, SCAN-STEP -Y = 0.29, SEARCH-SIZE-X = 3, SEARCH-SIZE- Comments: Using Peak acquisition to achieve 0.1 arcsec Y = 3 pointing accuracy (sequence A+B1+C1 from CAL/FOS-132). ------------------------------------------------------------------------------------------------------------------------------------ 330 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 1 SEQ 330-340 NON-INT ATMOS1 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 340 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 2 ATMOS1 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 350 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 3 SEQ 350-360 NON-INT ATMOS2 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 360 SATURN- FOS/RD RAPID 1.0 G400H READ-TIME = 1 40.18S SPATIAL SCAN 4 ATMOS2 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 17] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 370 SATURN-RING FOS/RD RAPID 1.0 G650L READ-TIME = 1 40.18S SPATIAL SCAN 5 SEQ 370-380 NON-INT 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: Warning: this scan occurs very near Saturn's limb, which is too bright for the G650L disperser used here. ------------------------------------------------------------------------------------------------------------------------------------ 380 SATURN-RING FOS/RD RAPID 1.0 G650L READ-TIME = 1 40.18S SPATIAL SCAN 6 0.287, SUB-STEP = 1, COMB = NO, STEP-TIME = 0.25 Comments: Warning: this scan occurs very near Saturn's limb, which is too bright for the G650L disperser used here. ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 18] Scan Paramters Form ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 1 Exposure Logsheet lines: FGS Scan: C Dwell Only: dwell points/line: 0 Seconds per dwell: 0.00 Scan width (arc-secs): 0.0000 Scan length (arc-secs): 3.0000 Angle between sides (degrees) 90.00 Number of lines: 1 Scan rate (arc-sec/sec): 0.0750 PA of first scan line (degrees) 114.500 Scan frame (CEL or S/C): CEL Length Offset (arc-sec): 1.5000 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 2 Exposure Logsheet lines: FGS Scan: C Dwell Only: dwell points/line: 0 Seconds per dwell: 0.00 Scan width (arc-secs): 1.0000 Scan length (arc-secs): 3.0000 Angle between sides (degrees) 90.00 Number of lines: 3 Scan rate (arc-sec/sec): 0.0750 PA of first scan line (degrees) 114.500 Scan frame (CEL or S/C): CEL Length Offset (arc-sec): 1.5000 Width Offset (arc-sec): 0.5000 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 3 Exposure Logsheet lines: FGS Scan: C Dwell Only: dwell points/line: 0 Seconds per dwell: 0.00 Scan width (arc-secs): 0.0000 Scan length (arc-secs): 3.0000 Angle between sides (degrees) 90.00 Number of lines: 1 Scan rate (arc-sec/sec): 0.0750 PA of first scan line (degrees) 90.000 Scan frame (CEL or S/C): CEL Length Offset (arc-sec): 1.5000 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 4 Exposure Logsheet lines: FGS Scan: C Dwell Only: dwell points/line: 0 Seconds per dwell: 0.00 Scan width (arc-secs): 1.0000 Scan length (arc-secs): 3.0000 Angle between sides (degrees) 90.00 Number of lines: 3 Scan rate (arc-sec/sec): 0.0750 PA of first scan line (degrees) 90.000 Scan frame (CEL or S/C): CEL Length Offset (arc-sec): 1.5000 Width Offset (arc-sec): 0.5000 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 5 Exposure Logsheet lines: FGS Scan: C Dwell Only: dwell points/line: 0 Seconds per dwell: 0.00 Scan width (arc-secs): 0.0000 Scan length (arc-secs): 3.0000 Angle between sides (degrees) 90.00 Number of lines: 1 Scan rate (arc-sec/sec): 0.0750 PA of first scan line (degrees) 147.500 Scan frame (CEL or S/C): CEL Length Offset (arc-sec): 1.5000 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 6 Exposure Logsheet lines: FGS Scan: C Dwell Only: dwell points/line: 0 Seconds per dwell: 0.00 Scan width (arc-secs): 0.5000 Scan length (arc-secs): 3.0000 Angle between sides (degrees) 90.00 Number of lines: 3 Scan rate (arc-sec/sec): 0.0750 PA of first scan line (degrees) 147.500 Scan frame (CEL or S/C): CEL Length Offset (arc-sec): 1.5000 Width Offset (arc-sec): 0.2500 ------------------------------------------------------------------------------------------------------------------------------------ 5824( 22) - 12/08/95 10:16 - [ 19] Summary Form for Proposal 5824 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/RD WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK RAPID IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE-X=1 SEARCH-SIZE-Y=3 SCAN-STEP-Y=1.23 SCAN-STEP-Y=0.61 SCAN-STEP-Y=0.17 SCAN-STEP-Y=0.052 STEP-TIME = 0.25 READ-TIME = 4.0 COMB = NO SUB-STEP = 1 READ-TIME = 0.287 CR-SPLIT=no SEARCH-SIZE-Y = 3 SEARCH-SIZE-Y = 2 SEARCH-SIZE-X = 3 SEARCH-SIZE-X = 1 SEARCH-SIZE-X = 6 SCAN-STEP-Y = 0.29 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Solar System ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE Fine BETWEEN 13-NOV-95 00 00 00 and 19-NOV-95 00 00 00 ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 30 ONBOARD ACQ FOR 40 ONBOARD ACQ FOR 420-450 PCS MODE Fine BETWEEN 20-NOV-95 00 00 00 and 20-NOV-95 01 00 00 END ORBIT RT ANALYSIS END ORBIT PCS MODE Fine BETWEEN 20-NOV-95 18 00 AND 20-NOV-95 19 00 RT ANALYSIS NO SPLIT END ORBIT POS TARG -0.3, -0.2 NO SPLIT SEQ 301-302 NON-INT POS TARG -1.7, -7.8 NO SPLIT PCS MODE Fine ONBOARD ACQ FOR 310 ONBOARD ACQ FOR 320 ONBOARD ACQ FOR 330-380 SPATIAL SCAN 1 SEQ 330-340 NON-INT SPATIAL SCAN 2 SPATIAL SCAN 3 SEQ 350-360 NON-INT SPATIAL SCAN 4 SPATIAL SCAN 5 SEQ 370-380 NON-INT SPATIAL SCAN 6 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G400H G650L FQCH4P15 ------------------------------------------------------------------------------------------------------------------------------------ Target Names GSC5249-01240 SATURN-EAST-ANSA SATURN-WEST-ANSA TETHYS SATURN-ATMOS1 SATURN-ATMOS2 SATURN-RING ------------------------------------------------------------------------------------------------------------------------------------