5836( 14) - 10/03/95 18:03 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5836 Version: 14 Check-in Date: ********** 1.Proposal Title: Saturn ring plane crossing observations in August and November 1995 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Solar System GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Philip Nicholson Cornell University CoI: Edward Danielson California Institute of Technology N CoI: Richard French Wellesley College N CoI: Steven Larson University of Arizona N CoI: Jack Lissauer SUNY Stony Brook N CoI: Patrick Seitzer University of Michigan N CoI: Mark Showalter Stanford University N CoI: Bruno Sicardy Observatoire de Paris, Meudon N ------------------------------------------------------------------------------------ 6. Abstract The plane of Saturn's rings passes through the earth on 10 August 1995, and through the sun on 17-21 November 1995, providing a rare opportunity to determine the thickness, vertical distortions, and pole orientation of the rings. A similar opportunity will not recur until the year 2038. We will obtain time series of images using the Wide Field Camera and methane filter at each crossing time, in order to measure the radial profile of apparent ring thickness, to determine the moment of the earth's crossing to within a few minutes, and to look for the expected warp in the ring plane due to satellite perturbations. In addition, the Planetary Camera will be used to recover the small satellites Pan and Atlas and thus refine their orbital periods. A series of multi-color WFC observations will be used to probe the structure and particle size distribution within the faint E and G rings. ------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 2] Observations Description ------------------------ We propose to observe the passage of the Earth through Saturn's ring plane on 10--11 August 1995 for a total of 9 consecutive orbits, and the passage of the Sun through the ring plane on 21 November 1995 for 6 orbits. VISIT 1: Prior to the actual RPX time on 10 August, we will use 2 orbits to study the color and spatial distribution of the E Ring, with an emphasis on UV imaging. Long WFC exposures of the west ansa (to avoid contamination by bright satellites) will be obtained with the wide-U (F300W) filter, plus shorter exposures with wide-B (F450W) and V and R filters, in order to constrain the particle size distribution and its spatial variations. The wide filters, though non-standard, are necessary because of the very faint signals expected. VISIT 2: On the remaining 7 orbits in August 1995, while looking at the `dark side' of the rings and during the Earth crossing itself, we will obtain a 600 sec exposure WFC image (FQCH4N filter, CR-SPLIT) covering both ring ansae to determine the radial profile of ring brightness, as well as a series of 100 sec PC exposures (FQCH4P15 filter) of the east and west ansa of the rings to detect and follow the orbital motions of the small satellites Pan and Atlas. Longer exposures would result in significant image smear. The 8922 Angstrom methane band filters will be used to minimize scattered light from Saturn. From linear fits to the pre-RPX and post-RPX branches of the ring light curve, we can interpolate to determine both the time of crossing and the edge-on brightness profile as a function of radius. Because all the major satellites will saturate in 600 sec, we will also obtain a 15 sec exposure in the same filter for astrometric and photometric calibration on each orbit. VISIT 3: We also propose to obtain PC images of both ring ansae in the six hours (4 orbits) immediately prior to the time of solar RPX on 21 November 1995, again using the FQCH4P15 methane-band filter to suppress scattered light from Saturn and exposure times of ~400 sec. VISITS 4 & 5: After the sun sets on the rings, we will obtain WFC images of the E and G rings (east and west ansae) in broadband F555W and F675W filters on 2 separate orbits. Observations are timed to avoid contamination of the fields by bright satellites. Real Time Justification ----------------------- Almost all of the proposed observations are time-critical, but do not depend on the exact phasing of the HST orbit relative to Saturn. We request those orbits which will permit observations of Saturn closest to the dates and times specified below. Uncertainties of +/-50 min in the specific observing times are acceptable, and have been factored into our requests. The predicted time of Earth's ring plane crossing (RPX) is 20:54 +/-16 min UT on 10 August, for the nominal pole precession rate and the Saturn pole determined by French et al. (1993). Allowing for a maximum plausible error of +/-100\ overall uncertainty in the time of RPX is +/ -102 min, spanning three HST orbits. In order to determine accurately the exact crossing time, it is necessary to have at least two observations of the brightness of the rings on consecutive HST orbits both before and after the moment of crossing, leading to a total requirement of 7 consecutive orbits. Therefore we request that these 7 orbits be centered on the nominal RPX time, so that we observe between August 10, 16:06 UT and August 11, 1:42 UT, or the nearest practicable approximation. The E Ring observations are not as time-critical, but should be made (1) shortly prior to August 10, when the dark side of the rings is visible, and (2) at a time when bright satellites are not present between distances of 2.5 and 8 Saturn radii (25-80'') from the planet on the ansa being observed. Prior to the above 7 orbits at Aug 9.75 - 10.3 is the optimal time, as it satifies both constraints and the ring brightness will be at a minimum. The predicted mid-time of the solar RPX is 15:09 +/-30 min UT on 19 November 1995, with an additional uncertainty of +/- 137 min associated with a maximum +/-100\ rate. Because of the finite solar angular diameter, the solar crossing takes place over a period of 3.71 days, centered on the above time. The critical time is when the last rays of the sun strike the observed (northern) side of the rings, on November 21, 11:59 UT and we wish to observe the main rings on the 4 orbits immediately prior to this time. The E and G rings will be observed shortly afterwards, optimally on November 27 and Nov 28 when bright satellites interfere least. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 4] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 1 | TARGET NAME: SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 6.6 B-V = 1.0 | Target center of Saturn disk. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 2 | 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. | ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 5] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 3 | 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. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 4 | TARGET NAME: SATURN-EAST-ERING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: RING SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = TORUS, LONG = 270, LAT = 0, RAD = | 3.25E05, POLE_LAT = +90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 18.6 B-V = 0.58 | Eastern ansa of Saturn E ring | centered 50 arcsec from center of | Saturn. | ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 6] TARGET LIST b)Solar System Targets ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 5 | TARGET NAME: SATURN-WEST-ERING ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: RING SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | TYPE = TORUS, LONG = 90, LAT = 0, RAD = | 3.25E05, POLE_LAT = +90 | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | SURF(V) = 18.6 B-V = 0.58 | Eastern ansa of Saturn E ring | centered 50 arcsec from center of | Saturn. | ------------------------------------------------------------------------------------------------------------------------------------ TARGET NUMBER: 33 | TARGET NAME: SAT-RPX-IMAGE-3 ------------------------------------------------------------------------------------------------------------------------------------ TARGET DESCRIPTION: PLANET SATURN ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 1 | TARGET POSITION LEVEL 2 | STD = SATURN | type = pos_angle, rad = 50.3, ang = | 274.6, ref = north | ------------------------------------------------------------------------------------------------------------------------------------ TARGET POSITION LEVEL 3 | WINDOWS | | WND FROM 10-AUG-95:15 TO 10-AUG-95:18 | ------------------------------------------------------------------------------------------------------------------------------------ DATA | COMMENTS | V = -0.6 +/- 0.5 SIZE = 19 +/- 3 F-CONT(5500) = | Imaging East ansa of rings on WF3 | with Saturn offset onto WF2. | ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 7] Visit: 01 Visit Requirements: BETWEEN 09-AUG-95:18:00 AND 10-AUG-95:05:00 On Hold Comments: Additional Comments: WF images of E ring prior to Aug RPX. Scheduled to avoid bright satellites on west ansa. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 101 SATURN-WEST WFPC2 IMAGE WF2-FIX F450W 4520 CR- 1 500S POS TARG 16.8, -9.0 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 Comments: make sure Saturn is out of field ------------------------------------------------------------------------------------------------------------------------------------ 102 SATURN-WEST WFPC2 IMAGE WF2-FIX F300W 2911 CR- 2 400S SAME POS AS 101 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 ------------------------------------------------------------------------------------------------------------------------------------ 103 SATURN-WEST WFPC2 IMAGE WF2-FIX F555W 5407 CR- 1 260S SAME POS AS 101 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 Comments: dither pointing 3 pixels from 101 ------------------------------------------------------------------------------------------------------------------------------------ 104 SATURN-WEST WFPC2 IMAGE WF2-FIX F675W 6714 CR- 1 400S POS TARG 16.8, -9.0 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 Comments: Increase exp. to maximize SNR ------------------------------------------------------------------------------------------------------------------------------------ 105 SATURN-WEST WFPC2 IMAGE WF2-FIX F300W 2911 CR- 2 500S SAME POS AS 104 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 ------------------------------------------------------------------------------------------------------------------------------------ 106 SATURN-WEST WFPC2 IMAGE WF2-FIX F300W 2911 CR- 1 400S SAME POS AS 104 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 8] Visit: 02 Visit Requirements: BETWEEN 10-AUG-95:13:00 AND 10-AUG-95:13:40 orient 246.788d to 246.788d On Hold Comments: Additional Comments: WF/PC images of main rings during Aug RPX. Nominal start time is Aug 10, 13:18 UT. Repeat for total of 6 orbits until Aug 11, 1:29 UT. Note that John Clarke's program should share orbits 19 and 20 from 14:54 - 17:26 UT. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 201 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: First Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 202 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 2 260S POS TARG -20.0,-3.0 NO SPLIT Comments: WF image of both ring ansae ------------------------------------------------------------------------------------------------------------------------------------ 203 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 15S SAME POS AS 202 NO SPLIT Comments: Short exposure for satellite calibration ------------------------------------------------------------------------------------------------------------------------------------ 204 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA ------------------------------------------------------------------------------------------------------------------------------------ 205 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT END ORBIT -ANSA Comments: Second Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 211 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 3 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: First Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 212 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 300S POS TARG -20.0,-3.0 Comments: WF image of both ring ansae If orbit is split over orbits 19 & 20, please put one of these exposures in each orbit. ------------------------------------------------------------------------------------------------------------------------------------ 213 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 15S SAME POS AS 212 NO SPLIT Comments: Short exposure for satellite calibration ------------------------------------------------------------------------------------------------------------------------------------ 311 SAT-RPX- WFPC2 IMAGE WF3-FIX F380W ATD-GAIN = 7 CR 1 350S IMAGE-3 -SPLIT = NO ------------------------------------------------------------------------------------------------------------------------------------ 312 SAT-RPX- WFPC2 IMAGE WF3-FIX F791W ATD-GAIN = 7 CR 1 100S IMAGE-3 -SPLIT = NO ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 9] Visit: 20 Visit Requirements: BETWEEN 10-AUG-95:18:00 AND 10-AUG-95:18:30 On Hold Comments: Additional Comments: WF/PC images of main rings during Aug RPX. Nominal start time is Aug 10, 13:18 UT. Repeat for total of 6 orbits until Aug 11, 1:29 UT. Note that John Clarke's program should share orbits 19 and 20 from 14:54 - 17:26 UT. Comments: Second Pan & Atlas sequence. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 221 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 3 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: First Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 222 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=0.5 1 600S POS TARG -20.0,-3.0 NO SPLIT Comments: WF image of both ring ansae ------------------------------------------------------------------------------------------------------------------------------------ 223 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 15S SAME POS AS 222 NO SPLIT Comments: Short exposure for satellite calibration ------------------------------------------------------------------------------------------------------------------------------------ 224 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: Second Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 225 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT END ORBIT -ANSA Comments: Second Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 231 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 3 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: First Pan & Atlas sequence. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 232 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=0.5 1 600S POS TARG -20.0,-3.0 NO SPLIT Comments: WF image of both ring ansae. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 233 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 15S SAME POS AS 232 NO SPLIT Comments: Short exposure for satellite calibration. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 234 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: Second Pan & Atlas sequence. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 235 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT END ORBIT -ANSA Comments: Second Pan & Atlas sequence. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 241 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 3 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: First Pan & Atlas sequence. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 242 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=0.5 1 600S POS TARG -20.0,-3.0 NO SPLIT Comments: WF image of both ring ansae. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 10] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 243 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 15S SAME POS AS 242 NO SPLIT Comments: Short exposure for satellite calibration. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 244 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT -ANSA Comments: Second Pan & Atlas sequence. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 245 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG -3.1, -7.4 NO SPLIT END ORBIT -ANSA Comments: Second Pan & Atlas sequence. Ignore SAA. ------------------------------------------------------------------------------------------------------------------------------------ 251 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 3 100S POS TARG 0.0, 0.0 NO SPLIT -ANSA Comments: First Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 252 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 2 300S POS TARG -20.0,-3.0 Comments: WF images of both ring ansae. If orbit is split over orbits 24 & 25, please put one of these exposures in each orbit. ------------------------------------------------------------------------------------------------------------------------------------ 253 SATURN WFPC2 IMAGE WF3-FIX FQCH4N 8922 CR-SPLIT=NO 1 15S SAME POS AS 252 NO SPLIT Comments: Short exposure for satellite calibration ------------------------------------------------------------------------------------------------------------------------------------ 254 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG 0.0, 0.0 NO SPLIT -ANSA Comments: Second Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 255 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 1 100S POS TARG 0.0, 0.0 NO SPLIT END ORBIT -ANSA Comments: Second Pan & Atlas sequence. ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 11] Visit: 03 Visit Requirements: BETWEEN 21-NOV-95:10:00 AND 21-NOV-95:11:00 On Hold Comments: Additional Comments: PC images of main rings just prior to Nov RPX. Nominal 1st frame time Nov 21, 7:12 UT. Repeat for a total of four (4) orbits until 12:00 UT. Note that program 5824 wishes to observe Saturn during and after Visit 3 from 8:00 - 14:15 UT. Note that 1 extra orbit is to be added here from August. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 301 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=0.5 1 600S 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=0.5 1 700S POS TARG -1.7, -7.8 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa) ---- --------------------------------------------- ------------------ ------------------------------------------------------------------------------------------------------------------------------------ 303 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 500S SAME POS AS 301 NO SPLIT -ANSA Comments: PC image of shadows on rings (east ansa) ------------------------------------------------------------------------------------------------------------------------------------ 304 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 400S SAME POS AS 302 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa). ------------------------------------------------------------------------------------------------------------------------------------ 305 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 500S SAME POS AS 301 NO SPLIT -ANSA Comments: PC image of shadows on rings (east ansa) ------------------------------------------------------------------------------------------------------------------------------------ 306 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 400S SAME POS AS 302 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa). ------------------------------------------------------------------------------------------------------------------------------------ 307 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 500S SAME POS AS 301 NO SPLIT -ANSA Comments: PC image of shadows on rings (east ansa) ------------------------------------------------------------------------------------------------------------------------------------ 308 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 400S SAME POS AS 302 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa). ------------------------------------------------------------------------------------------------------------------------------------ 309 SATURN-EAST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 500S SAME POS AS 301 NO SPLIT -ANSA Comments: PC image of shadows on rings (east ansa) ------------------------------------------------------------------------------------------------------------------------------------ 310 SATURN-WEST WFPC2 IMAGE PC1-FIX FQCH4P15 8922 CR-SPLIT=NO 2 400S SAME POS AS 302 NO SPLIT -ANSA Comments: PC image of shadows on rings (west ansa). ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 12] Visit: 04 Visit Requirements: BETWEEN 27-NOV-95:08:00 AND 27-NOV-95:13:00 On Hold Comments: Additional Comments: WF images of western E & G rings after Nov RPX. Date range required to avoid bright satellites on west ansa. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 401 SATURN-WEST WFPC2 IMAGE WF3-FIX F555W 5407 CR- 2 400S POS TARG -13.5, +8.1 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 Comments: make sure Saturn is out of the field ------------------------------------------------------------------------------------------------------------------------------------ 402 SATURN-WEST WFPC2 IMAGE WF3-FIX F675W 6714 CR- 2 400S SAME POS AS 401 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 13] Visit: 05 Visit Requirements: BETWEEN 28-NOV-95:07:00 AND 28-NOV-95:15:00 On Hold Comments: Additional Comments: WF images of eastern E & G rings after Nov RPX. Date range required to avoid bright satellites on east ansa. 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 WF2-FIX F555W 5407 CR- 2 400S POS TARG 13.5, -8.1 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 Comments: make sure Saturn is out of the field ------------------------------------------------------------------------------------------------------------------------------------ 502 SATURN-EAST WFPC2 IMAGE WF2-FIX F675W 6714 CR- 2 400S SAME POS AS 501 NO SPLIT -ERING SPLIT=NO,SUM=2X 2 ------------------------------------------------------------------------------------------------------------------------------------ 5836( 14) - 10/03/95 18:03 - [ 14] Summary Form for Proposal 5836 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO SUM=2X2 ATD-GAIN = 7 CR-SPLIT = NO CR-SPLIT=0.5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Solar System ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 09-AUG-95 18 00 AND 10-AUG-95 05 00 POS TARG 16.8, -9.0 NO SPLIT SAME POS AS 101 NO SPLIT SAME POS AS 104 NO SPLIT BETWEEN 10-AUG-95 13 00 AND 10-AUG-95 13 40 orient 246.788d to 246.788d POS TARG -3.1, -7.4 NO SPLIT POS TARG -20.0,-3.0 NO SPLIT SAME POS AS 202 NO SPLIT POS TARG -3.1, -7.4 NO SPLIT END ORBIT POS TARG -20.0,-3.0 SAME POS AS 212 NO SPLIT BETWEEN 10-AUG-95 18 00 AND 10-AUG-95 18 30 SAME POS AS 222 NO SPLIT SAME POS AS 232 NO SPLIT SAME POS AS 242 NO SPLIT POS TARG 0.0, 0.0 NO SPLIT SAME POS AS 252 NO SPLIT POS TARG 0.0, 0.0 NO SPLIT END ORBIT BETWEEN 21-NOV-95 10 00 AND 21-NOV-95 11 00 POS TARG -0.3, -0.2 NO SPLIT SEQ 301-302 NON-INT POS TARG -1.7, -7.8 NO SPLIT SAME POS AS 301 NO SPLIT SAME POS AS 302 NO SPLIT BETWEEN 27-NOV-95 08 00 AND 27-NOV-95 13 00 POS TARG -13.5, +8.1 NO SPLIT SAME POS AS 401 NO SPLIT BETWEEN 28-NOV-95 07 00 AND 28-NOV-95 15 00 POS TARG 13.5, -8.1 NO SPLIT SAME POS AS 501 NO SPLIT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F450W F300W F555W F675W FQCH4P15 FQCH4N F380W F791W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SATURN-WEST-ERING SATURN-EAST-ANSA SATURN SAT-RPX-IMAGE-3 SATURN-WEST-ANSA SATURN-EAST-ERING ------------------------------------------------------------------------------------------------------------------------------------