!   $Id: 5633,v 3.1 1994/07/27 19:56:37 pepsa Exp $
coverpage:
  title_1:         ASTEROID SHAPE AND DUPLICITY
    sci_cat:       SOLAR SYSTEM
    sci_subcat:    MINOR PLANETS
    proposal_for:  GO
    pi_title:      DR.
    pi_fname:      BENJAMIN
    pi_lname:      ZELLNER
    pi_inst:       1780
    pi_country:    USA
    pi_phone:      410-338-4729
    keywords_1:    IDA
    hours_pri:     1.8
    num_pri:       2
    wf_pc:         Y
    time_crit:     Y
    pi_position:
    off_fname:     BENJAMIN
    off_mi:        H.
    off_lname:     ZELLNER
    off_title:     DR.
    off_inst:      1780
    off_addr_1:    3700 SAN MARTIN DRIVE
    off_city:      BALTIMORE
    off_state:     MD
    off_zip:       21218
    off_country:   USA
    off_phone:     410-338-4729
abstract:
LINE_1:  We here propose a followup of HST Cycle 3 program 4521, a survey
LINE_2:  program using the Planetary Camera to image about 25 mainbelt minor
LINE_3:  planets selected as good candidates for extreme shape or duplicity.
LINE_4:  We propose six generic visits which may be allocated among any objects
LINE_5:  which were found to be binary in Cycle 3, or other candidates
LINE_6:  similarly selected on the basis of large-amplitude lightcurves and/or
LINE_7:  slow rotation.
LINE_8:
LINE_9:  This program was activated in March 1994 for images of asteroid
LINE_10: 243 Ida and possible satellites.
general_form_proposers:
  lname:           ZELLNER
    fname:         BENJAMIN
    title:         DR.
    mi:
    inst:
    country:       USA
    esa:           N
  lname:           WELLS
    fname:         ED
    title:         DR.
    mi:
    inst:
    country:       USA
    esa:           N
  lname:           STORRS
    fname:         ALEX
    title:         DR.
    mi:
    inst:          STSCI
    country:       USA
    esa:           N
  lname:           THOLEN
    fname:         DAVID
    title:         DR.
    mi:
    inst:          UNIVERSITY OF HAWAII
    country:       USA
    esa:           N
  lname:           CHAPMAN
    fname:         CLARK
    title:         DR.
    mi:            R.
    inst:          PLANETARY SCIENCE INSTITUTE
    country:       USA
    esa:           N
general_form_text:
  question:        3
    section:       1
    line_1:        Two orbits of observations have been approved: each will be identical to
    line_2:        the other. Two images in the blue are made with the F439W filter at a
    line_3:        nominal exposure time, followed by two images in the far red (F785LP).
    line_4:        Then a third pair of exposures (also with F785LP) are made at a longer
    line_5:        exposure time, to maximize the counts from faint nearby companions.
    line_6:        This series of six images is repeated after a POS TARG movement of a
    line_7:        non-integral number of pixels, both to minimize the effects of local
    line_8:        defects and to dither the images for reconstruction.
    line_9:
    line_10:
    line_11:
    line_12:
    line_13:
  question:        4
    section:       1
    line_1:        Only HST provides the sensativity and high spatial resolution to observe
    line_2:        the faint companions expected to be seen.
    line_3:
    line_4:
    line_5:
    line_6:
    line_7:
    line_8:
  question:        5
    section:       1
    line_1:        These observations should be scheduled as soon as possible. The results
    line_2:        will be used by the Galileo imaging team in deciding which of their Ida
    line_3:        flyby images to read down, and which to destroy.
    line_4:
    line_5:
    line_6:
  question:        6
    section:       1
    line_1:        The two orbits are requested to be about 8 hours apart, roughly a quarter
    line_2:        of what the period of satellite is believed to be. The observations should
    line_3:        be made while Ida is at minimum brightness, to minimize the contrast with
    line_4:        the satellite.
    line_5:
  question:        8
    section:       1
    line_1:        This is all being done in a hurry. Please contact Zellner, Wells, Noll, or
    line_2:        Storrs with any implementation questions.
general_form_address:
  lname:           ZELLNER
    fname:         BENJAMIN
    mi:            H.
    title:         DR.
    category:      PI
    inst:          1780
    addr_1:        3700 SAN MARTIN DRIVE
    city:          BALTIMORE
    state:         MD
    zip:           21218
    country:       USA
    phone:         410-338-4729
SOLAR_SYSTEM_TARGETS:
  TARGNUM: 1
  NAME_1:  243-IDA
  DESCR_1: ASTEROID IDA
  LEV1_1:  STD = 243
  FLUXNUM_1:  1
  FLUXVAL_1:  V=15.0 +/- 1.0
EXPOSURE_LOGSHEET:
  LINENUM:     1.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F439W
  NUM_EXP:         1
  TIME_PER_EXP:   35.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:    CYCLE 4;
  REQ_2:    SEQ 1 - 6 NO GAP;
  REQ_3:    PERIOD 2.31682 H +/- 0.00002 H  ;
  REQ_4:   ZERO-PHASE 25-APR-94:03:22:54 +/- 1S;
  REQ_5:   PHASE 0.00 +/- 0.25;
  REQ_6:   GUID TOL 0.01" / 1 - 12
  COMMENT_1: ASTEROID IDA FIRST VISIT, BLUE FILTER,
  COMMENT_2: NOMINAL EXPOSURES. NOMINAL EXPOSURE
  COMMENT_3: IN F439W IS 16.2 SECONDS AT V = 15.0
  COMMENT_4: FOR 2000 DN IN TOTAL IMAGE, MAX 1000
  COMMENT_5: PEAK PIXEL.  ZERO-PHASE IS JD
  COMMENT_6: 2449467.6270 + 20M light-time.
  LINENUM:     1.500
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F439W
  NUM_EXP:         1
  TIME_PER_EXP:   35.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:    CYCLE 4;
  COMMENT_1: ASTEROID IDA FIRST VISIT, BLUE FILTER,
  COMMENT_2: NOMINAL EXPOSURES. NOMINAL EXPOSURE
  COMMENT_3: IN F439W IS 16.2 SECONDS AT V = 15.0
  COMMENT_4: FOR 2000 DN IN TOTAL IMAGE, MAX 1000
  COMMENT_5: PEAK PIXEL. SECOND BLUE IMAGE
  LINENUM:     2.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   5.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1: ASTEROID IDA, FIRST VISIT, V FILTER
  COMMENT_2: NOMINAL EXPOSURE IN F555W IS 2.4S
  COMMENT_3: FOR 2000 DN TOTAL IMAGE, 1000 DN
  COMMENT_4: (MAX).  EXPOSURE 5.0 SEC SHOULD
  COMMENT_5:  GIVE 2083 DN PEAK PIX
  LINENUM:     3.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   10.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA, FIRST VISIT, V FILTER
  COMMENT_2:  AT V=15.0, 10.0 SEC SHOULD GIVE
  COMMENT_3:  SLIGHT SATURATION.
  LINENUM:     4.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F439W
  NUM_EXP:         2
  TIME_PER_EXP:    35S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  REQ_2:    POS TARG 0.452, 0.452 / 4 - 6
  COMMENT_1:  ASTEROID IDA OFFSET, FIRST VISIT, B
  LINENUM:     5.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   5.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA OFFSET, FIRST VISIT,
  COMMENT_2:  VIS FILTER, NOMINAL EXPOSURE
  LINENUM:     6.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   10.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA OFFSET, FIRST VISIT, V
  COMMENT_2:  EXPECT SLIGHT SATURATION.
  COMMENT_3:  THIS FINISHES FIRST VISIT;
  COMMENT_4:  12 EXPOSURES.
  LINENUM:     7.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F439W
  NUM_EXP:         1
  TIME_PER_EXP:   35.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  REQ_2:   SEQ 7 - 12 NO GAP;
  REQ_3:   PERIOD 2.31682 H +/- 0.00002 H  ;
  REQ_4:   ZERO-PHASE 25-APR-94:03:22:54 +/- 1S;
  REQ_5:   PHASE 0.00 +/- 0.25;
  REQ_6:   AFTER 1 BY 8H +/- 2H
  COMMENT_1:  ASTEROID IDA, SECOND VISIT, BLUE
  COMMENT_2:  FILTER.  "AFTER 1" REQUIREMENT
  COMMENT_3:  CAN BE RELAXED IF IT
  COMMENT_4:  PRESENTS SCHEDULING PROBLEMS.
  COMMENT_5:  FIRST BLUE IMAGE
  LINENUM:     7.500
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F439W
  NUM_EXP:         1
  TIME_PER_EXP:   35.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA, SECOND VISIT, BLUE
  COMMENT_2:  FILTER.  "AFTER 1" REQUIREMENT
  COMMENT_3:  CAN BE RELAXED IF IT
  COMMENT_4:  PRESENTS SCHEDULING PROBLEMS.
  COMMENT_5:  SECOND BLUE IMAGE
  LINENUM:     8.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   5.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA, SECOND VISIT, V
  COMMENT_2:  FILTER, NOMINAL EXPOSURE
  LINENUM:     9.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   10S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA, SECOND VISIT, V
  COMMENT_2:  FILTER, DEEP EXPOSURE.
  COMMENT_3:  EXPECT SLIGHT SATURATION.
  LINENUM:     10.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F439W
  NUM_EXP:         2
  TIME_PER_EXP:  10.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  REQ_2:    POS TARG 0.452, 0.452 / 10 - 12
  COMMENT_1:  ASTEROID IDA OFFSET, SECOND VISIT,
  COMMENT_2:  BLUE FILTER.
  LINENUM:     11.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   5.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA OFFSET, SECOND VISIT,
  COMMENT_2:  V FILTER, NOMINAL EXPOSURE
  LINENUM:     12.000
  TARGNAME:    243-IDA
  CONFIG:      WFPC2
  OPMODE:      IMAGE
  APERTURE:    PC1
  SP_ELEMENT:  F555W
  NUM_EXP:         2
  TIME_PER_EXP:   10.0S
  FLUXNUM_1:       1
  PRIORITY:        1
  PARAM_1:  READ = 1
  PARAM_2:  CR-SPLIT = NO
  REQ_1:       CYCLE 4;
  COMMENT_1:  ASTEROID IDA OFFSET, SECOND VISIT,
  COMMENT_2:  V FILTER DEEP EXPOSURE.
  COMMENT_3:  EXPECT SLIGHT SATURATION.
!~~~RPSS~~~,STORRS,ida.prop,24-MAR-1994 13:58