!  File:  1107C.PROP
!  Database:  PEPDB
!  Date:  16-FEB-1994:01:59:43

coverpage:

  title_1:         PLANETARY NEBULAR STRUCTURE (WF/PC-03)
    sci_cat:       INTERSTELLAR MEDIUM
    proposal_for:  GTO/WFC
    pi_title:      PROF.
    pi_fname:      JAMES
    pi_mi:         A.
    pi_lname:      WESTPHAL
    pi_inst:       CALTECH
    pi_country:    USA
    pi_phone:      (818) 356-4900
    keywords_1:    PLANETARY NEBULAE, MASS LOSS, EVOLUTION, NEBULA
    hours_pri:     2.30
    num_pri:       6
    pi_position:   PROFESSOR OF PLANETA
! end of coverpage

abstract:

    line_1:        Observations of planetary nebulae utilizing the WF/PC are based upon the high
    line_2:        angular resolution. Structure at the level of E+14 cm is seen in only one
    line_3:        planetary NGC7293, Helix nebula. It is in the size range from E+14 to E+15 cm
    line_4:        that the origin of long lived condensation is expected. Are the features seen
    line_5:        in the Helix common to most planetaries? Do these condensations result in
    line_6:        shadowing that can explain the ionization structure?
    line_7:        The other objective of this program is to repeat the measurements on a few
    line_8:        years baseline in order to study the temporal variations of well defined
    line_9:        condensation. This may provide distance determinations as well as dynamic
    line_10:       information.

!
! end of abstract

general_form_proposers:

  lname:           WESTPHAL
    fname:         JAMES
    mi:            A.
    inst:          CALTECH
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        The surface brightness is relatively low requiring long exposures. With the
    line_2:        filters chosen to discriminate between shadowed and unshadowed regions exposure
    line_3:        times of the order of an hour may be required. Since the identification and
    line_4:        reality of small features is vital a short exposure to assist in identifying
    line_5:        cosmic ray hits is taken. The cycle 0 or 1 observations also provide first
    line_6:        epoch images for a study of motions in the nebulae. The first return to this
    line_7:        imaging is planned for cycles 2, 3, or 4. Based on these results future
    line_8:        observations may be considered.

!

  question:        5
    section:       1
    line_1:        No real time or special scheduling required.

!

  question:        8
    section:       1
    line_1:        No supporting or coordinated observations required.

!

  question:        13
    section:       1
    line_1:        Observations of nearby planetary nebulae will show structure if present on a
    line_2:        scale of 10dex14 cm. Images will be obtained in H-alpha, HeII and NII in order
    line_3:        to test current models of the nature of the condensations. It is also planned
    line_4:        to repeat observations in order to measure proper motions of well defined
    line_5:        condensations.

!
!end of general form text

general_form_address:

  lname:           WESTPHAL
    fname:         JAMES
    mi:            A.
    title:         PROF.
    category:      PI
    inst:          CALTECH
    addr_1:        M/S 170-25
    addr_2:        DIVISION OF GEOLOGICAL &
    addr_3:        PLANETARY SCIENCES
    city:          PASADENA
    state:         CA
    zip:           91125
    country:       USA

!
! end of general_form_address records

fixed_targets:

    targnum:       2
    name_1:        NGC6853
    descr_1:       PLANETARY NEBULA
    pos_1:         RA= 19H59M32.5S +/- .1S,
    pos_2:         DEC= +22D43'11" +/- 1"
    equinox:       2000
    pm_or_par:     NO
    acqpr_1:       EXT
    plate_req:     NO

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    sequence_1:    DEFINE
    sequence_2:    PN
    targname:      #
    config:        WFC
    opmode:        IMAGE
    aperture:      ALL
    sp_element:    F656N
    num_exp:       1
    time_per_exp:  1800S
    priority:      #
    param_1:       CR-SPLIT=0.5,
    param_2:       PRE-FLASH=YES,
    param_3:       CR-TOLERANCE=0.0
    req_1:         NON-INT / 1-5;
    req_2:         GROUP 1-5 NO GAP;
    req_3:         POS TARG 0,0 / 1-5;
    req_4:         SAME POS FOR 3-5 AS 1;
    req_5:         SAME ORIENT FOR 3-5 AS 1;
    comment_1:     CYCLE 0 VERSION:  11/21/90

!

    linenum:       3.000
    sequence_1:    ^
    targname:      ^
    config:        ^
    opmode:        ^
    aperture:      ^
    sp_element:    F469N
    num_exp:       ^
    time_per_exp:  1800S
    priority:      ^
    param_1:       CR-SPLIT=NO,
    param_2:       PRE-FLASH=YES

!

    linenum:       5.000
    sequence_1:    ^
    targname:      ^
    config:        ^
    opmode:        ^
    aperture:      ^
    sp_element:    F658N
    num_exp:       ^
    time_per_exp:  1800S
    priority:      ^
    param_1:       CR-SPLIT=NO,
    param_2:       PRE-FLASH=YES
    comment_1:     THIS SEQUENCE IS INTENDED TO FIT
    comment_2:     INTO THREE ORBITS, ONE PER LINE.
    comment_3:     ADJUST EXPOSURE TIMES +/- 20 PERCENT
    comment_4:     TO FIT.

!

    linenum:       8.000
    sequence_1:    USE
    sequence_2:    PN
    targname:      NGC6853
    priority:      1
    req_1:         CYCLE 0;

!
! end of exposure logsheet

! No scan data records found