! Proposal 6806, submission 2 ! PI: Richard French ! Received Fri Feb 16 16:05:09 EST 1996 ! From: rfrench@ahab.wellesley.edu ! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /usr/users/cmcghee/RPS2dir/6806.prop ! ! Revisions: ! ---------- ! Version 23: Wed Feb 14 10:59:17 EST 1996 ! - standard UBVRI sequence on each ansa, CH4, and selected ! composition filters. Change preferences of visit times for ! visits 2 and 3 to allow more vertical orientation of rings. ! - include exposures for G Ring during visits 2B and 4 ! Version 24: Wed Feb 14 13:35:18 EST 1996 ! - delete constraints on Prometheus for Visit 2, add them to Visit 3 ! Version 25: Fri Feb 16 09:24:02 EST 1996 ! - change dates of visits to allow for conjunction of Prometheus, Pandora ! - change dates to correct for JD conversion bug ! - modify POS TARG for G ring exposures, change ansae, so that planet ! is on the WF chip, not in the region surrounding the PC chip, which ! is not well baffled. ! Version 26: Fri Feb 16 10:03:14 EST 1996 ! - add restriction that Visit 3 have Prometheus in field for E ansa. ! - add constraints for large satellites to be out of field for G ring ! - allow for possible pointing error of 2 arcsec by putting a bit of F ring ! in the field along overlap between WF and PC chips. ! - constrain visit times more severely to have optimal satellite orientation ! for G Ring exposures. Proposal_Information Title: Saturn's Rings Proposal_Category: GO Scientific_Category: SOLAR SYSTEM Cycle: 6 CoInvestigators PI_Name: Richard French PI_Institution: Wellesley College CoI_Name: Jack Lissauer CoI_Institution: State University of New York at Stony Brook Contact: CoI_Name: Jeff Cuzzi CoI_Institution: NASA Ames Research Center Contact: CoI_Name: Luke Dones CoI_Institution: San Jose State University Contact: N Abstract: Saturn's rings are a unique dynamical laboratory and, more than a decade after Voyager, continue to present challenging problems which require additional data to attack. Making use of the capabilities of HST, and the changing geometry of the rings as seen from Earth orbit over the next seven years, we propose to address important outstanding problems such as the composition of the ring material (which is known to be radially variable on spatial scales down to hundreds of km), the ``filling factor" of the rings (which is a key constraint on their dynamical behavior), continuing controversy over the cause of the ``opposition brightening", transient gravitational instabilities (from their photometric signatures), azimuthal asymmetries in ring brightness, and the temporal variability of ``spokes" and other dynamically interesting regions. We propose to obtain a coherent set of images of the Saturnian ring system over the course of 1/4 Saturn year (7 Earth years) using filters UBVRI and methane with the PC chip of WFPC2. The rings will be imaged four times per year (at 0,0.6,2, and 6 degrees phase) using this filter set; exposures with two other filters designed to measure composition will augment our standard set as time allows. We will attempt to image the G ring with the PC in the V filter when the ring is at its lowest tilt angle. Questions ! 1) Note that several of our time windows are rather strict, and !our calculated POS TARG values assume fairly specific ORIENT angles. !We do not want to impose the overhead of rolling the spacecraft to !a specific ORIENT, but if the ORIENT value is substantially different !from what we have assumed, we will have to recompute POS TARG values !to optimize the location of the rings on the PC chip for G Ring exposures. ! 2) The schedulability of our observations is uncertain because of !RPS2 limitations, and it is possible that we will need to relax our !time constraints. We assume that we will do this in consultation with !you as you refine the schedule. ! 3) *** FOR VISIT 4 **** our desired time of observations is ! BETWEEN 26-SEP-96:13:00:00 AND 26-SEP-96:18:00:00 !but when we run RPS2 with this window, it takes 7 minutes for the GSA and !9 minutes for the first exposure, for reasons that we do not understand. !If it is possible, we would like to specify this observing window. In order !to get past the RPS2 objection of too many orbits, however, we have !specified BETWEEN 26-SEP-96:00:00:00 AND 28-SEP-96:00:00:00 Observing_Description: Our primary goal for Cycle 6 observations is to obtain high resolution (PC) images of both ansae of Saturn's rings over a broad range of colors at phase angles near 6,2,0.7 and ~0 degrees (corresponding to visits 1 through 4, respectively). The UBVRI exposures will be used to study color variations across the rings and for photometric modelling of the rings with varying illumination and viewing geometry. We want UBVRI coverage of BOTH ansae with the PC during every visit. The F785LP and F1042M exposures will be used for composition studies of the rings, and less frequent coverage is acceptable. The FQCH4 (8922A) filter will be used to suppress Saturn-shine onto the rings. A second goal is to observe Prometheus near greatest Eastern or Western elongation during at least one visit (and preferably during two widely-spaced visits), to determine its position and orbital characteristics. Recent HST/Ring Plane Crossing observations show that Prometheus now lags by 19 degrees of orbital longitude behind the JPL ephemeris position based on Voyager observations. The origin of this lag is not understood, and additional observations are needed to help sort out the dynamics at work. A third objective of our ring observations is to attempt to image the faint G Ring, which lies just outside the F Ring and the main ring system. It was detected during the November 1995 ring plane crossing HST observations, but in 2x2 binned WF images only. We hope to get two PC images of the ring when the tilt angle of the rings is near its minimum, which maximizes the slant path optical depth (and hence the contrast) of the rings. We will observe with the F555W filter, which gave the best SNR during the RPX observations. The desired image would provide higher spatial resolution of ring structure and information about the ring particle scattering properties. The orbital geometry of Saturn during Cycle 6 is such that there are two periods when the phase angle near each of our desired values of 6, 2, and 0.7 degrees, and either the pre- or post-opposition periods would give comparable science return. However, we STRONGLY PREFER that Visit 1 (the ~6 degree phase angle observations) occur EARLY in Cycle 6, rather than at the end. Early images will provide us with valuable information about how to optimize the observing strategy during the crucial low phase angle visits, when the opposition surge is most pronouced and when scheduling is most critical. The proposal as submitted results in scheduling diagnostics from the RPS2 software for Visits 3 and 4, since RPS2 claims that Saturn is not visible at opposition. We believe this is an RPS2 program error. After conversations with Dustin Manning, we have been given permission to submit our proposal as is, recognizing that the detailed schedule of exposures will require use of the actual STSCI planning software. Real_Time_Justification: The primary time-critical events in our visits are that we observe Saturn at a number of fairly specific phase angles, and that whenever possible, the visits be timed so that Prometheus is not in front of or behind the planet. For the G Ring exposures, we would like to have a small satellite in the field to allow for accurate astrometry, but we want to avoid having large satellites nearby, since they would be badly overexposed, with large diffraction spikes which could contaminate our measurements of the faint ring. We have calculated times that are ideal but if these prove impossible to use, these constraints can be relaxed. For each visit, we summarize below the strategy behind our choices of exposures and targets. We have adopted a uniform numbering scheme for the exposures, as follows: Exposure #ijk, where i=visit number j=index for a set of exposures with the same pointing, but different filters k=filter index: 1 F336W U 2 F439W B 3 F555W V 4 F675W R 5 F814W I 6 F785LP for study of ring composition (=COMP#1) 7 F1042M for study of ring composition (=COMP#2) 8 FQCH4P15 (8922A) for suppression of Saturn shine (=CH4) Visit 1 - high phase angle (phase angle > 5.5 degrees), Prometheus/Pandora Conjunction -------------------------------------------------------------------------------------- Possible dates: BETWEEN 02-JUL-96:11:00:00 AND 10-JUL-96:11:00:00 <== STONGLY preferred or BETWEEN 29-Nov-96 AND 14-Jan-97 Rationale: This is the period of highest phase angle. It varies slowly during these periods, and this provides a wide window of visibility. We have imposed the requirement that Prometheus be near Eastern elongation during this visit so that we can get good positions for it, and also that Prometheus and Pandora be near conjunction (which occurs on 06-JUL-96:11:00:00). Exposures: Description: .............................................................................. 101-105 UBVRI of East Ansa of main rings, Prometheus near E. elongation 106 COMP#1 of E ansa 108 CH4 of E ansa 111-115 UBVRI of W ansa Options: If easier to schedule with Prometheus near W. elongation, we could switch E=>W and W=>E in all of the above exposures. Visit 2 - intermediate phase angle (phase angle ~2.0 degrees), G Ring attempt -------------------------------------------------------------------------------- Possible dates: BETWEEN 14-OCT-96:07:00:00 AND 16-Oct-96:09:00:00 or BETWEEN 14-OCT-96:00:00:00 AND 16-Oct-96:00:00:00 or BETWEEN 08-SEP-96:00:00:00 AND 10-SEP-96:00:00:00 Rationale: This is the period of intermediate phase angle. We strongly prefer the October period since the ring tilt angle is small, enhancing the contrast of the faint G Ring, and because the ring orientation is more closely parallel to the columns of the chip and diffraction effects should be less severe. Ideal times (7h - 9h 14 OCT) are for optimal satellite positions for G Ring exposures: major satellites visible in WF chip but away from G Ring, small satellite Epimetheus in G ring field for astrometry. Exposures: Description: .............................................................................. 201-205 UBVRI of East Ansa of main rings 211-215 UBVRI of W ansa 233 V of E ansa of G Ring Visit 3 - low phase angle coverage rings (phase angle ~0.7 degrees), Prometheus -------------------------------------------------------------------------------- Possible dates: BETWEEN 01-OCT-96:00:00:00 AND 03-OCT-96:00:00:00 or BETWEEN 21-SEP-96:00:00:00 AND 23-SEP-96:00:00:00 Rationale: This is the period of low phase angle. We prefer the later of the two periods because the ORIENT angle is more favorable for avoiding diffraction spike problems. Exposures: Description: .............................................................................. 301-305 UBVRI of East Ansa of main rings, Prometheus near E elong. 306 COMP#2 of E ansa 308 CH4 of E ansa 311-315 UBVRI of W ansa Visit 4 - minimum phase angle (~0.2 degrees), G Ring attempt -------------------------------------------------------------------------------- Possible dates: BETWEEN 26-SEP-96:13:00:00 AND 26-SEP-96:18:00:00 or BETWEEN 26-SEP-96:00:00:00 AND 28-SEP-96:00:00:00 Rationale: This is the period of minimum phase angle during this Cycle. Observations during this period are highly desirable to characterize the opposition surge in brightness near zero phase angle. 13h-18h on 26 SEP gives optimal satellite positions for G Ring observations (Large satellites away from G Ring but visible on WF chip, Epimetheus in G ring field. Exposures: Description: .............................................................................. 401-405 UBVRI of East Ansa of main rings 411-415 UBVRI of W ansa 433 V of E ansa of G Ring Calibration_Justification: We require no additional calibration exposures. We will be using the standard UBVRI filter set, the FQCH4P15 (8922A) filter, and F785LP and F1042M. We assume that the UBVRI and CH4 filters have been extensively calibrated, and that the F785LP and F1042M filters are sufficiently well understood not to require additional calibration. If major satellites are in the field, they can be used as local calibrators. The inclination of the rings to the line of sight is sufficiently large (and the exposures sufficiently short) that we do not expect scattered light from the satellites to contaminate our view of the rings (unlike the situation during ring plane crossing). Additional_Comments: Fixed_Targets Solar_System_Targets ! N.B. Several of these targets are commented out. They are retained in ! case we need to change the schedule to observe with the WF instead of ! the PC, or if we need to switch from E to W ansa for the Prometheus ! observations. ! Target_Number: 1 ! Target_Name: SATURN ! Description: PLANET SATURN ! Level_1: STD=SATURN ! Level_2: ! Level_3: ! Window: ! Flux: ! SURF(V) = 6.6 ! B-V = 1.0 ! Comments: Target center of Saturn disk. Used for WF images. Not ! used in nominal proposal. Target_Number: 2 Target_Name: SATURN-EAST-ANSA Description: RING SATURN Level_1: STD=SATURN Level_2: TYPE=TORUS,LONG=270,LAT=0,RAD=70000,POLE_LAT=+90 Level_3: Window: Flux: SURF(V) = 7.3 B-V = 0.9 Comments: Eastern ansa of Saturn rings centered on inner C Ring. This centering insures that entire ring ansa and most of planet will be visible in a full PC frame, independent of the orientation angle. This is important, since near zero phase angle, the U3 direction changes rapidly. Target_Number: 3 Target_Name: SATURN-WEST-ANSA Description: RING SATURN Level_1: STD=SATURN Level_2: TYPE=TORUS,LONG=90,LAT=0,RAD=70000,POLE_LAT=+90 Level_3: Window: Flux: SURF(V) = 7.3 B-V = 0.9 Comments: Western ansa of Saturn rings centered on inner C Ring. This centering insures that entire ring ansa and most of planet will be visible in a full PC frame, independent of the orientation angle. This is important, since near zero phase angle, the U3 direction changes rapidly. Target_Number: 4 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Description: RING SATURN Level_1: STD=SATURN Level_2: TYPE=TORUS,LONG=270,LAT=0,RAD=70000,POLE_LAT=+90 Level_3: Window: OLG OF PROMETHEUS BETWEEN 60 140 SEP OF PANDORA SATURN FROM EARTH GT 15" Flux: SURF(V) = 7.3 B-V = 0.9 Comments: E ansa of rings centered on inner C Ring. Prometheus near Eastern elongation. OLG limits allow for lag of Prometheus by 19 degrees from standard ephemeris, and insure it is at least 90,000 km in the sky plane from the center of Saturn. SEP puts both Pandora, Prometheus in field. ! Target_Number: 5 ! Target_Name: SATURN-WEST-ANSA-PROMETHEUS ! Description: RING SATURN ! Level_1: STD=SATURN ! Level_2: TYPE=TORUS,LONG=270,LAT=0,RAD=70000,POLE_LAT=+90 ! Level_3: ! Window: OLG OF PROMETHEUS BETWEEN 240 320 ! SEP OF PANDORA SATURN FROM EARTH GT 15" ! Flux: ! SURF(V) = 7.3 ! B-V = 0.9 ! Comments: W ansa of rings centered on inner C Ring. !Prometheus near Eastern elongation. OLG limits allow !for lag of Prometheus by 19 degrees from standard ephemeris, !and insure it is at least 90,000 km in the sky plane from !the center of Saturn. OLG restriction is a strong preference, not absolute !requirement. Not used in nominal proposal. Target_Number: 6 Target_Name: SATURN-EAST-ANSA-CH4 Description: RING SATURN Level_1: STD=SATURN Level_2: TYPE=TORUS,LONG=270,LAT=0,RAD=107000,POLE_LAT=+90 Level_3: Window: Flux: SURF(V) = 7.3 B-V = 0.9 Comments: Eastern ansa of Saturn rings centered on the mid-ring region. This centering insures that entire ring ansa will be visible in the unvignetted region of the PC frame in the FQCH4N filter, independent of the orientation angle. This is important, since near zero phase angle, the U3 direction changes rapidly. ! Target_Number: 7 ! Target_Name: SATURN-WEST-ANSA-CH4 ! Description: RING SATURN ! Level_1: STD=SATURN ! Level_2: TYPE=TORUS,LONG=90,LAT=0,RAD=107000,POLE_LAT=+90 ! Level_3: ! Window: ! Flux: ! SURF(V) = 7.3 ! B-V = 0.9 ! Comments: Western ansa of Saturn rings centered on the mid-ring region. !This centering insures that entire ring ansa will be !visible in the unvignetted region of the PC frame in the FQCH4N filter, !independent of the orientation angle. This is important, since near zero !phase angle, the U3 direction changes rapidly. Not used in nominal proposal. Target_Number: 8 Target_Name: SATURN-EAST-ANSA-G-RING Description: RING SATURN Level_1: STD=SATURN Level_2: TYPE=TORUS,LONG=270,LAT=0,RAD=168000,POLE_LAT=+90 Level_3: Window: SEP OF MIMAS SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" SEP OF ENCELADUS SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" SEP OF TETHYS SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" SEP OF DIONE SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" SEP OF RHEA SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" SEP OF TITAN SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" SEP OF IAPETUS SATURN-EAST-ANSA-G-RING FROM EARTH GT 15" Flux: SURF(V) = 7.3 B-V = 0.9 Comments: Eastern ansa of Saturn rings centered on G Ring. Window keeps major satellites out of nearby field of target so diffraction and blooming won't interfere. Flux listed is for A Ring. Used for Visit 2. Target_Number: 9 Target_Name: SATURN-WEST-ANSA-G-RING Description: RING SATURN Level_1: STD=SATURN Level_2: TYPE=TORUS,LONG=90,LAT=0,RAD=168000,POLE_LAT=+90 Level_3: Window: SEP OF MIMAS SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" ! SEP OF ENCELADUS SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" ! SEP OF TETHYS SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" SEP OF DIONE SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" SEP OF RHEA SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" SEP OF TITAN SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" SEP OF IAPETUS SATURN-WEST-ANSA-G-RING FROM EARTH GT 15" Flux: SURF(V) = 7.3 B-V = 0.9 Comments: Western ansa of Saturn rings centered on G Ring. Window keeps major satellites out of nearby field of target so diffraction and blooming won't interfere. Flux listed is for A Ring. Used for Visit 4. Enceladus and Tethys are off of PC so SEP requirement commented out for those satellites. Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: BETWEEN 30-NOV-96 AND 15-JAN-97 On_Hold_Comments: Visit_Comments: phase angle >5.5 deg, Pandora-Prometheus conjunction. (BETWEEN 30-NOV-96 AND 15-JAN-97 gives same phase angle coverage but is much less desirable since we want an early series of images to be able to optimize our near zero-phase vists.) If it is easier to schedule Prometheus at elongation on the West ansa, replace EAST by WEST within Target_Names for 101-108, and WEST by EAST in 111-118. Exposure_Number: 101 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 102 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 101 Comments: B filter Exposure_Number: 103 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: .3S Special_Requirements: SAME POS AS 101 Comments: V filter Exposure_Number: 104 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F675W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: .3S Special_Requirements: SAME POS AS 101 Comments: R filter Exposure_Number: 105 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 101 Comments: I filter. Will compare this with exposure 108 to quantify Saturn-shine. Exposure_Number: 106 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F785LP Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.8S Special_Requirements: SAME POS AS 101 Comments: Filter selected for composition studies of rings. ! ! Exposure_Number: 107 ! Target_Name: SATURN-EAST-ANSA-PROMETHEUS ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! SAME POS AS 101 ! Comments: Filter selected for composition studies of rings. ! If time available, can extend this exposure to 60s. ! Exposure_Number: 108 Target_Name: SATURN-EAST-ANSA-CH4 Config: WFPC2 Opmode: IMAGE Aperture: FQCH4P15 Sp_Element: FQCH4P15 Wavelength: 8922 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 20S Special_Requirements: POS TARG 0,0 Comments: CH4 filter to decrease Saturn shine on rings, to compare to I filter exposure. Centered on middle of rings because of vignetting across chip in this filter. Exposure_Number: 111 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 112 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 111 Comments: B filter. Exposure_Number: 113 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 111 Comments: V filter. ! Exposure_Number: 114 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F675W ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 0.3S !Special_Requirements: ! SAME POS AS 111 ! Comments: R filter ! Exposure_Number: 115 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F814W ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 0.3S !Special_Requirements: ! SAME POS AS 111 ! Comments: I filter ! Exposure_Number: 116 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! SAME POS AS 111 ! Comments: ! Exposure_Number: 117 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! SAME POS AS 111 ! Comments: Filter selected for compositional studies of rings. ! Exposure_Number: 118 ! Target_Name: SATURN-WEST-ANSA-CH4 ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4P15 ! Sp_Element: FQCH4P15 ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: W ansa CH4 image. ! Exposure_Number: 126 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! POS TARG 0,0 ! Comments: The 126-128 exposure series is a WF3 set of ! images in the three non-UBVRI filters. Probably will not use these. ! ! Exposure_Number: 127 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: WF3 image would give full ring coverage in one ! exposure, but lower resolution. ! Exposure_Number: 128 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4W3 ! Sp_Element: FQCH4N ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: Retained in case we decide to do WF3 images later Visit_Number: 02 Visit_Requirements: BETWEEN 13-OCT-96:07:00:00 AND 17-Oct-96:09:00:00 ORIENT 48D TO 68D On_Hold_Comments: Visit_Comments: phase angle ~2 deg. Tight time constraints are for optimal satellite locations (Epimetheus in G Ring field, large satellites on WF4 chip for astrometry). If unschedulable, can relax time constraints as follows: BETWEEN 14-OCT-96:00:00:00 AND 16-Oct-96:00:00:00 BETWEEN 08-SEP-96:00:00:00 AND 10-SEP-96:00:00:00 give same phase angle coverage. Prometheus coverage desirable but not mandatory. We compute the nominal ORIENT to be 58D for this visit, but since this is near opposition, we list this requirement for insurance since the POS TARG we compute for the G Ring exposure assumes ORIENT=58D Exposure_Number: 201 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 202 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 201 Comments: B filter Exposure_Number: 203 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 201 Comments: V filter Exposure_Number: 204 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F675W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 201 Comments: R filter Exposure_Number: 205 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 201 Comments: I filter. Will compare this with exposure 208 to quantify Saturn-shine. ! Exposure_Number: 206 ! Target_Name: SATURN-EAST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! SAME POS AS 201 ! Comments: Filter selected for composition studies of rings. !# Exposure_Number: 207 !# Target_Name: SATURN-EAST-ANSA !# Config: WFPC2 !# Opmode: IMAGE !# Aperture: PC1-FIX !# Sp_Element: F1042M !# Wavelength: !# Optional_Parameters: !#Number_of_Iterations: 1 !# Time_Per_Exposure: 40S !#Special_Requirements: !# SAME POS AS 201 !# Comments: Filter selected for composition studies of rings. !# If time available, can extend this exposure to 60s. !# Exposure_Number: 208 !# Target_Name: SATURN-EAST-ANSA-CH4 !# Config: WFPC2 !# Opmode: IMAGE !# Aperture: FQCH4P15 !# Sp_Element: FQCH4P15 !# Wavelength: 8922 !# Optional_Parameters: !#Number_of_Iterations: 1 !# Time_Per_Exposure: 40S !#Special_Requirements: !# POS TARG 0,0 !# Comments: CH4 filter to decrease Saturn shine on rings, to !# compare to I filter exposure. Centered on middle !# of rings because of vignetting across chip in this filter. Exposure_Number: 211 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 212 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 211 Comments: B filter. Exposure_Number: 213 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 211 Comments: V filter. ! Exposure_Number: 214 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F675W ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 0.3S !Special_Requirements: ! SAME POS AS 211 ! Comments: R filter ! Exposure_Number: 215 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F814W ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 0.3S !Special_Requirements: ! SAME POS AS 211 ! Comments: I filter ! Exposure_Number: 216 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! SAME POS AS 211 ! Comments: This filter used visits 1,3 ! Exposure_Number: 217 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! SAME POS AS 211 ! Comments: Filter selected for compositional studies of rings. ! Exposure_Number: 218 ! Target_Name: SATURN-WEST-ANSA-CH4 ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4P15 ! Sp_Element: FQCH4P15 ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: W ansa CH4 image. ! Exposure_Number: 226 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! POS TARG 0,0 ! Comments: The 226-228 exposure series is a WF3 set of ! images in the three non-UBVRI filters. Probably will not use these. ! ! Exposure_Number: 227 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: WF3 image would give full ring coverage in one ! exposure, but lower resolution. ! Exposure_Number: 228 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4W3 ! Sp_Element: FQCH4N ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: Retained in case we decide to do WF3 images later Exposure_Number: 233 Target_Name: SATURN-EAST-ANSA-G-RING Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: POS TARG 5.0,-14.0 Comments: G Ring, V filter. Put main rings into WF4. Reduce exposure time as needed to fit into visit. If ORIENT differs greatly from 58D, need to recompute this POS TARG. Visit_Number: 03 Visit_Requirements: BETWEEN 30-SEP-96:00:00:00 AND 04-OCT-96:00:00:00 On_Hold_Comments: Visit_Comments: phase angle ~0.6 deg. BETWEEN 21-SEP-96:00:00:00 AND 23-SEP-96:00:00:00 gives same phase angle coverage, but orientation of planet is less favorable since diffraction spikes will be parallel to rings. Exposure_Number: 301 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 302 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 301 Comments: B filter Exposure_Number: 303 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 301 Comments: V filter Exposure_Number: 304 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F675W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 301 Comments: R filter Exposure_Number: 305 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 301 Comments: I filter. Will compare this with exposure 308 to quantify Saturn-shine. Exposure_Number: 306 Target_Name: SATURN-EAST-ANSA-PROMETHEUS Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F785LP Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.8S Special_Requirements: SAME POS AS 301 Comments: Filter selected for composition studies of rings. ! Exposure_Number: 307 ! Target_Name: SATURN-EAST-ANSA-PROMETHEUS ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! SAME POS AS 301 ! Comments: Filter selected for composition studies of rings. ! If time available, can extend this exposure to 60s. ! Exposure_Number: 308 ! Target_Name: SATURN-EAST-ANSA-CH4 ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4P15 ! Sp_Element: FQCH4P15 ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 20S !Special_Requirements: ! POS TARG 0,0 ! Comments: CH4 filter to decrease Saturn shine on rings, to !compare to I filter exposure. Centered on middle of rings because of !vignetting across chip in this filter. Exposure_Number: 311 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 312 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 311 Comments: B filter. Exposure_Number: 313 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 311 Comments: V filter. Exposure_Number: 314 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F675W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 311 Comments: R filter Exposure_Number: 315 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 311 Comments: I filter ! Exposure_Number: 316 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! SAME POS AS 311 ! Comments: ! Exposure_Number: 317 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! SAME POS AS 311 ! Comments: Filter selected for compositional studies of rings. ! If time available, can extend this exposure to 60s. ! Exposure_Number: 318 ! Target_Name: SATURN-WEST-ANSA-CH4 ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4P15 ! Sp_Element: FQCH4P15 ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: W ansa CH4 image. ! Exposure_Number: 326 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! POS TARG 0,0 ! Comments: The 326-328 exposure series is a WF3 set of ! images in the three non-UBVRI filters. Probably will not use these. ! ! Exposure_Number: 327 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: WF3 image would give full ring coverage in one ! exposure, but lower resolution. ! Exposure_Number: 328 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4W3 ! Sp_Element: FQCH4N ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: Retained in case we decide to do WF3 images later Visit_Number: 04 Visit_Requirements: ! ORIENT 320D TO 5D BETWEEN 26-SEP-96:00:00:00 AND 01-OCT-96:00:00:00 On_Hold_Comments: Visit_Comments: opposition phase angle ~0.3 deg. ORIENT changes rapidly during the course of this visit because it is at opposition. We do not require a precise ORIENT value, but if the value is substantially different from this range, we need to recompute the POS TARG for exposure 433. If time constraints too tight to allow scheduling, relax constraints on satellite positions. Phase angle varies slowly during this pd: BETWEEN 26-SEP-96:00:00:00 AND 28-SEP-96:00:00:00 Exposure_Number: 401 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Wavelength: 3344 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 35S Special_Requirements: POS TARG 0,0 Comments: U filter. Exposure_Number: 402 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: SAME POS AS 401 Comments: B filter Exposure_Number: 403 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 401 Comments: V filter Exposure_Number: 404 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F675W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 401 Comments: R filter Exposure_Number: 405 Target_Name: SATURN-EAST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 401 Comments: I filter. Will compare this with exposure 408 to quantify Saturn-shine. ! Exposure_Number: 406 ! Target_Name: SATURN-EAST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! SAME POS AS 401 ! Comments: Filter selected for composition studies of rings. !# Exposure_Number: 407 !# Target_Name: SATURN-EAST-ANSA !# Config: WFPC2 !# Opmode: IMAGE !# Aperture: PC1-FIX !# Sp_Element: F1042M !# Wavelength: !# Optional_Parameters: !#Number_of_Iterations: 1 !# Time_Per_Exposure: 40S !#Special_Requirements: !# SAME POS AS 401 !# Comments: Filter selected for composition studies of rings. !# If time available, can extend this exposure to 60s. !# Exposure_Number: 408 !# Target_Name: SATURN-EAST-ANSA-CH4 !# Config: WFPC2 !# Opmode: IMAGE !# Aperture: FQCH4P15 !# Sp_Element: FQCH4P15 !# Wavelength: 8922 !# Optional_Parameters: !#Number_of_Iterations: 1 !# Time_Per_Exposure: 40S !#Special_Requirements: !# POS TARG 0,0 !# Comments: CH4 filter to decrease Saturn shine on rings, to !#compare to I filter exposure. Centered on middle of rings because of !#vignetting across chip in this filter. ! Exposure_Number: 411 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F336W ! Wavelength: 3344 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 35S !Special_Requirements: ! POS TARG 0,0 ! Comments: U filter. Exposure_Number: 412 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F439W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 4S Special_Requirements: ! SAME POS AS 411 Comments: B filter. Exposure_Number: 413 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 412 Comments: V filter. Exposure_Number: 414 Target_Name: SATURN-WEST-ANSA Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F675W Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 0.3S Special_Requirements: SAME POS AS 412 Comments: R filter ! Exposure_Number: 415 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F814W ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 0.3S !Special_Requirements: ! SAME POS AS 411 ! Comments: I filter ! Exposure_Number: 416 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! SAME POS AS 411 ! Comments: ! Exposure_Number: 417 ! Target_Name: SATURN-WEST-ANSA ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: PC1-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! SAME POS AS 411 ! Comments: Filter selected for compositional studies of !rings. If time available, can extend this exposure to 60s. ! ! Exposure_Number: 418 ! Target_Name: SATURN-WEST-ANSA-CH4 ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4P15 ! Sp_Element: FQCH4P15 ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: W ansa CH4 image. ! Exposure_Number: 426 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F785LP ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 1S !Special_Requirements: ! POS TARG 0,0 ! Comments: The 426-428 exposure series is a WF3 set of ! images in the three non-UBVRI filters. Probably will not use these. ! Exposure_Number: 427 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: WF3-FIX ! Sp_Element: F1042M ! Wavelength: ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: WF3 image would give full ring coverage in one ! exposure, but lower resolution. ! Exposure_Number: 428 ! Target_Name: SATURN ! Config: WFPC2 ! Opmode: IMAGE ! Aperture: FQCH4W3 ! Sp_Element: FQCH4N ! Wavelength: 8922 ! Optional_Parameters: !Number_of_Iterations: 1 ! Time_Per_Exposure: 40S !Special_Requirements: ! POS TARG 0,0 ! Comments: Retained in case we decide to do WF3 images later Exposure_Number: 433 Target_Name: SATURN-WEST-ANSA-G-RING Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: POS TARG -13.5,0.0 Comments: G Ring, V filter. Put main rings into WF2. Reduce exposure time as needed to fit into visit. This POS TARG assumes ORIENT=340D. If ORIENT differs greatly from this, POS TARG will need to be recomputed. Data_Distribution ! Defaults indicated; change if desired Medium: 8MM Blocking_Factor: 10 Ship_To: PI_Address Ship_Via: UPS Recipient_Email: ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator