!   $Id: 5559,v 5.1 1994/07/27 19:19:26 pepsa Exp $

coverpage:

  title_1:         WFPC2 ASTROMERTRIC CALIBRATION
    proposal_for:  CAL/WFC
    pi_title:      DR.
    pi_fname:      ROBERTO
    pi_lname:      GILMOZZI
    pi_inst:       STSCI
    pi_country:    USA
    pi_phone:      (410)338-4760
    keywords_1:    ASTROMETRIC CALIBRATION OF WFPC2
    pi_position:   SOB BRANCH CHIEF
! end of coverpage

abstract:

    line_1:        The purpose of this calibration test is to determine the
    line_2:        plate distortions in the WFPC2 camera. This information is
    line_3:        necessary for correctly calculating coordinates used in
    line_4:        WFPC2 assisted target acquisition with the small-aperture
    line_5:        science instruments and for calibrating WFPC2 astrometric
    line_6:        performance. The target field is observed at several
    line_7:        overlapping positions so that many stellar separations of
    line_8:        various sizes and position angles can be measured in
    line_9:        different regions of each CCD.

!
! end of abstract

general_form_proposers:

  lname:           GILMOZZI
    fname:         ROBERTO
    inst:          STSCI
    country:       USA

!

  lname:           KINNEY
    fname:         ELLYNE
    inst:          STSCI
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        This calibration is crucial for supporting the WFPC2 assisted
    line_2:        target acquisitions. It is expected that the WFPC2 will
    line_3:        display a substantial geometrical distortion, similar to that
    line_4:        of WF/PC, which would impair any astrometry performed with
    line_5:        it. Measurements intended for subsequent "blind offsets" with
    line_6:        other, small aperture instruments would be particularly
    line_7:        affected. Gilmozzi and White (1991) have shown that it is
    line_8:        possible to remove the distortion down to a level of 0.01".
    line_9:        This type of correction has been successfully applied to
    line_10:       WF/PC, and was used to calculate positions for WF/PC assisted
    line_11:       target acquistions and to produce geometrically correct
    line_12:       mosaics of WF/PC observations. This proposal calibrates the
    line_13:       field of view for the three WF chips and the PC chip. To do
    line_14:       so we plan to observe a moderately crowded globular cluster
    line_15:       in the LMC (NGC1850). The telescope will take an exposure at

!

  question:        3
    section:       2
    line_1:        10 different positions within the cluster so as to have the
    line_2:        same group of stars in each quadrant and in the center of
    line_3:        the chip. Comparing the relative positions of the stars in
    line_4:        each sector will yield the relative distortion between
    line_5:        sectors, which will then be tied together in the central,
    line_6:        overlapping area. The outcome of this proposal will be a
    line_7:        two-dimensional polynomial which will be  used to correct the
    line_8:        x,y coordinates of each chip. The observations will be
    line_9:        performed in the F569W filter. However, we will check for
    line_10:       wavelength dependence of the distortion by taking images in
    line_11:       F160BW, F439W and F791W. The use of the same target as in the
    line_12:       study of WF/PC will allow us to compare the distortions of
    line_13:       the WF/PC to the distortions of the WFPC2.

!

  question:        4
    section:       1
    line_1:        Instrument calibration.

!

  question:        5
    section:       1
    line_1:        The prerequsites for this is a calibration activity
    line_2:        are that the final telescope focus and collimation be
    line_3:        adopted and the observation should be taken in the CVZ.

!

  question:        6
    section:       1
    line_1:        Avoid the SAA for all exposures.

!

  question:        7
    section:       1
    line_1:        These data will be analyzed at STScI and the results will
    line_2:        be part of the ScI calibration data base and will be included
    line_3:        in WFPC2 Instrument Handbook.

!
!end of general form text

general_form_address:

  lname:           GILMOZZI
    fname:         ROBERTO
    category:      PI
    inst:          STSCI

!

  lname:           KINNEY
    fname:         ELLYNE
    category:      CON
    inst:          STSCI
    addr_1:        3700 SAN MARTIN DR
    city:          BALTIMORE
    state:         MD
    zip:           21218
    country:       USA
    phone:         (410)338-4516

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        NGC1850
    descr_1:       J,701
    pos_1:         RA = 05H 08M 59S +/-1.0S,
    pos_2:         DEC = -68D 49' 24" +/- 5.0"
    equinox:       1950

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.100
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  100S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         CYCLE 4 / 1.1-2.5;
    req_2:         SEQ 1.1-1.65 NO GAP;
    comment_1:     AVOID SAA FOR ALL EXPOSURES.
    comment_2:     USE SAME GUIDE STARS FOR 1.1-1.8,
    comment_3:     IF POSSIBLE
    comment_4:     SCHEDULE DURING CVZ

!

    linenum:       1.200
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  100S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG 19.5,-19.5

!

    linenum:       1.300
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  100S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG -19.5,-19.5

!

    linenum:       1.400
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  100S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG -19.5,19.5

!

    linenum:       1.500
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  100S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG 19.5,19.5

!

    linenum:       1.600
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F160BW
    num_exp:       1
    time_per_exp:  2000S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0

!

    linenum:       1.650
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F170W
    num_exp:       1
    time_per_exp:  2000S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0

!

    linenum:       1.700
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F439W
    num_exp:       1
    time_per_exp:  1000S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0

!

    linenum:       1.800
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F791W
    num_exp:       1
    time_per_exp:  1000S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0

!

    linenum:       2.100
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  200S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         SEQ 2.1-2.5 NO GAP;
    comment_1:     AVOID SAA FOR ALL EXPOSURES.
    comment_2:     USE SAME GUIDE STARS FOR 2.1-2.6,
    comment_3:     IF POSSIBLE
    comment_4:     SCHEDULE DURING CVZ

!

    linenum:       2.200
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  200S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG 8.5,-8.5

!

    linenum:       2.300
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  200S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG -8.5,-8.5

!

    linenum:       2.400
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  200S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG -8.5,8.5

!

    linenum:       2.500
    targname:      NGC1850
    config:        WFPC2
    opmode:        IMAGE
    aperture:      WFALL
    sp_element:    F569W
    num_exp:       1
    time_per_exp:  200S
    priority:      1
    param_1:       CR-SPLIT=0.7,
    param_2:       ATD-GAIN=15,
    param_3:       CR-TOLERANCE=0.0
    req_1:         POS TARG 8.5,8.5

!
! end of exposure logsheet

! No scan data records found