! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6679,v 14.1 1996/04/10 14:13:06 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6679,v 14.1 1996/04/10 14:13:06 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-0745.weaver.prop ! Date generated: Fri Dec 22 16:19:22 EST 1995 ! ! This is version "f" of GO-6679 and is being used to support the ! late March-early April 1996 observations of comet C/1996 B2 Hyakutake. ! In this version I use the SCHED=100% special requirement, as requested ! by Andy Lubenow. This latter change means that we only have ~50 min ! of target visibility per orbit, so some trimming of exp times was ! required relative to the earlier versions. The DROP TO GYRO special ! requirement was dropped, since Andy says that this is NOT the way ! to do what we want in this program (i.e., drop to GYRO tracking if ! the GSs get driven out of the pickles during the observation). ! This version also incorporates Yeomans' JPL Reference ! Solution 8 for the Hyakutake orbital elements. Proposal_Information ! Section 4 Title: HST Investigation of a Bright, New Comet Proposal_Category: GO Scientific_Category: SOLAR SYSTEM Cycle: 6 Investigators PI_name: Harold Weaver PI_Institution: Applied Research Corporation CoI_Name: Michael A'Hearn CoI_Institution: University of Maryland, College Park Contact: ! Y or N (designate at most one contact) CoI_Name: Claude Arpigny CoI_Institution: Universite de Liege Contact: ! Y or N (designate at most one contact) CoI_Name: Jack Brandt CoI_Institution: University of Colorado Contact: ! Y or N (designate at most one contact) CoI_Name: Paul Feldman CoI_Institution: Johns Hopkins University Contact: ! Y or N (designate at most one contact) CoI_Name: Cora Randall CoI_Institution: University of Colorado Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose a Target of Opportunity program to investigate any bright, dynamically new comet discovered during Cycle 6. For a comet having mbox4<=V<=7, we request 11 orbits to obtain FOS and GHRS spectra covering the wavelength range from 1150 Angstrom\ to 6820 Angstrom, from which an inventory of volatile abundances for all known UV- and optically-emitting species can be compiled. This spectrum will also allow deep searches for previously undetected or weak emissions from CO, \cotwo, \stwo, \methanol, \formaldehyde, SO, \sotwo, PAHs, H II, SH, NO, and other species. In the unlikely event that an exceptionally bright, new comet is discovered (i.e. one having V<=4), we would then request Director's Discretionary time in order to measure the OD/OH ratio, obtain information on the spatial brightness distribution of various species, and investigate in detail the excitation mechanisms for several emissions. Finally, the images taken in this program will provide fundamentally new information on cometary nuclei. This program is part of our continuing program to study both dynamically new and periodic comets with HST. We note that C/1995 O1 (Hale-Bopp) will be the target of our periodic comet program and is covered in a separate proposal. Questions ! Free format text (please update) Observing_Description: This is a 7-orbit program that will be executed on the recently discovered comet C/1996 B2 (Hyakutake). Due to the rapid apparent motion of this object, each orbit will be in a different visit, even when using consecutive orbits. Due to ephemeris uncertainty and the comet's rapid motion near the time of closest approach to Earth, the imaging observations on 3/25 must be executed under GYRO control. However, we do want a GS ACQ at the beginning of this orbit in order to take out the drift error that has accumulated prior to our observations. For the observations during the first week in April, both the ephemeris uncertainty and the comet's motion should be much lower. For these six orbits, we would like to perform as many of the observations as possible under FGS control, and drop to GYROS only when necessary. Note that the REUSE OFFSET capability will be used extensively in this program. Here's an orbit-by-orbit outline of our observing plan. #1: PC imaging during 3/25-27/96 (comet perigee) All of the following orbits should be executed during 4/1-4, with the earlier times being better. #2: PC imaging #3: FOS/BL G270H (IMAGE mode) + FOS/BL G190H #4: FOS/BL G270H (IMAGE mode) + FOS/BL G190H #5: FOS/RD G270H (IMAGE mode) + FOS/RD G270H #6: GHRS G140L (1295-1580 A) #7: GHRS G140L (1295-1580 A) SEQ 2-7 WITHIN 864M (i.e., within ~9 orbits) Real_Time_Justification: An approximate suitability criterion for the Target of Opportunity observed under this program is that the comet should have: Q_H_2O >= 2 * 10^29 * R^2 Delta where R and Delta are the heliocentric and geocentric distances, in AU, respectively. This criterion corresponds roughly to a comet having a total (integrated over the entire coma) visual magnitude V<=7. Based on IUE experience during the past decade, a comet satisfying the above criterion should appear at least once every two years. Our observations are time- critical in that the comet will be optimally placed for a period of days to weeks. If we are lucky, the comet will be recovered several months prior to the optimal observation time. We expect to be doing supporting IR and optical observations, but no specific plans have yet been made. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Solar_System_Targets ! Section 5.2 Target_Number: 1 Target_Name: HYAKUTAKE-1 Description: COMET HYAKUTAKE Level_1:TYPE=COMET, ! Satellite of Sun Q=0.230112895, E=1.000019546, I=124.86457, O=188.07081, W=130.19062, T=01-MAY-96:10:10:21, EPOCH=03-MAY-96, EQUINOX=J2000 Ephem_Uncert: 10000 KM Acq_Uncert: 20" Window: Flux: V = 10 ! Include at least V and B-V B-V = 0.8 V-R = 0.4 Comments: V-mag is for 0.7 arcsec diameter aperture. Elements are from Yeomans ref solution 6 and must be updated prior to final scheduling. Target_Number: 2 Target_Name: HYAKUTAKE-2 Description: COMET HYAKUTAKE Level_1:TYPE=COMET, ! Satellite of Sun Q=0.230112895, E=1.000019546, I=124.86457, O=188.07081, W=130.19062, T=01-MAY-96:10:10:21, EPOCH=03-MAY-96, EQUINOX=J2000 Ephem_Uncert: 10000 KM Acq_Uncert: 20" Window: Flux: V = 10 ! Include at least V and B-V B-V = 0.8 V-R = 0.4 Comments: V-mag is for 0.7 arcsec diameter aperture. Elements are from Yeomans ref solution 6 and must be updated prior to final scheduling. ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed ! 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 ! 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