!Hi Andy, ! ! Finally here is my RPS2 form for GO 6621. Because of my computer !propblems here at Maryland and the temporary loss of a full GByte !of disc space, I was not able to actually run this template through !the RPS2 software. SInce it is a really short one, would you be able !to run this through for me? I hope everything is clear but I will be !around the office (although actually in meetings) for most of today !and tomorrow. thanks much. ! ! Mike A'Hearn ! ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6621,v 7.1 1996/07/08 15:09:08 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6621,v 7.1 1996/07/08 15:09:08 pepsa Exp $ ! ! Refer to the HST Phase II Proposal Instructions to fill this out ! ! Anything after a "!" is ignored, and may be deleted ! ! All keywords with multiple entries are comma delimited except the ! Visit_Requirements and Special_Requirements keywords which can be ! delimited with carriage returns or semi-colons, but not commas ! ! For help call your Program Coordinator: Lubenow ! Phone: 410-338-4928 , E-mail: lubenow@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0589.ahearn.prop ! Date generated: Fri Dec 22 16:18:02 EST 1995 ! Proposal_Information ! Section 4 Title: 55P/Tempel-Tuttle and the Leonid Meteors Proposal_Category: GO Scientific_Category: SOLAR SYSTEM Cycle: 6 Investigators PI_name: Michael F. A'Hearn PI_Institution: University of Maryland CoI_Name: Martin Beech CoI_Institution: University of Western Ontario Contact: ! Y or N (designate at most one contact) CoI_Name: Peter Brown CoI_Institution: University of Western Ontario Contact: ! Y or N (designate at most one contact) CoI_Name: Philippe L. Lamy CoI_Institution: Laboratoire d'Astronomie Spatiale Contact: ! Y or N (designate at most one contact) CoI_Name: Harold A. Weaver CoI_Institution: Applied Research Corp. Contact: ! Y or N (designate at most one contact) CoI_Name: Donald K. Yeomans CoI_Institution: Jet Propulsion Laboratory Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) Comet 55P/Tempel-Tuttle, the parent of the Leonid meteor stream, provides a very rare opportunity to study the relationship of cometary ejection processes to a meteor stream. The comet comes to perihelion (P = 33 yr) in cycle 7 with an unusually close approach to Earth (Delta = 0.35 AU in January 1998). There is a reasonable probability that this will lead to a major meteor storm in the Leonid shower and modeling of the shower to predict the storm requires knowledge of the comet's nuclear properties. There is no reliable estimate of even the size of the nucleus. We propose to observe the comet at very large heliocentric distance in cycle 6 to obtain an estimate of the size and rotational period, the factors that have the largest effect on the predictions of the meteor stream. During cycle 7 we propose to observe the nucleus and circum-nuclear region at closest approach to Earth as part of Lamy's ongoing program of observing comets within 0.7 AU of Earth. This will enable us to estimate the active fraction of the nucleus, obtain the color of the nucleus for comparison with the colors of other Near-Earth objects, and to determine the relationship of the nuclear outgassing to the nuclear rotation. This will also enable us to directly compare the two approaches for determining nuclear sizes - observation at small geocentric distance with explicit removal of the coma and observation at large heliocentric distance assuming negligible coma, while simultaneously learning about the possible activity at large heliocentric distance. Questions ! Free format text (please update) Observing_Description: We propose to image the comet for one orbit early in cycle 6 (August 1996, r_H ~ 6 AU) with F606W and CR-SPLIT to obtain with maximum sensitivity a preliminary estimate of the size and to determine the apparent magnitude with sufficient precision to optimize subsequent observations. The position and rate (of order 15 arcsec per hour) will be calculated by co-I Yeomans and these will be accurate enough that interactive acquistion is not required. The observation should be obtained before the comet is lost in the solar avoidance zone in late 1996 in order to ensure that there is minimal coma. During this period, the comet's heliocentric motion is negligible but Earth is moving away from the comet so the comet is getting somewhat fainter. Thus the observation should be made as soon in Cycle 6 as possible. The tactics for the single observation in cycle 6 are straightforward. Co-I Yeomans will provide the best estimate of the orbital elements shortly before the observation is to be carried out. This can be done before the SMS is sent to GSFC, i.e. several weeks before the observation. The orbital elements included in the Target List were obtained from the IAU Central Bureau for Astronomical Telegrams (i.e. from Brian Marsden) on 15 Feb 1996. We will point blind so as to put the nucleus near the center of the PC chip, actual position is not important except that it should avoid any known bad rows or columns. We will track on the comet's rate for the orbit and make two exposures through F606W for the full orbit. This should result in two exposures of approximately 800 seconds each. The actual exposure times should be adjusted to fill the orbit and they need not be of equal duration, although they should probably not differ by as much as a factor 2. Additional observations have been approved by the Cycle 6 TAC for Cycle 7 but these must be reviewed by the Cycle 7 TAC and will not be described until the time of phase 2 submission for Cycle 7. Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Solar_System_Targets ! Section 5.2 Target_Number:01 Target_Name:C-Tempel-Tuttle Description:COMET 55P/Tempel-Tuttle Level_1:TYPE=COMET ! Satellite of Sun Q=0.9751862 E=0.9055453 I=162.47504 O=235.22530 W=172.50522 T=27-FEB-98:11:05:28 EPOCH=27-APR-96 EQUINOX=J2000 Level_2: ! Satellite of Level_1 Level_3: ! Satellite of Level_2 Ephem_Uncert:600s ! Needed for REQ EPHEM CORR sp req Acq_Uncert: ! Needed for SAVE and USE OFFSET sp reqs Window: Flux:V=26, B-V=0.7 ! Include at least V and B-V Comments: ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number:10 Visit_Requirements:BEFORE 30-SEP-96 ! Section 7.1 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling ! PCS MODE [Fine | Gyro] ! GUIDing TOLerance ! DROP TO GYRO IF NECESSARY [NO REACQuisition] ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! SCHEDulability ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN