!  File:  4790C.PROP
!  Database:  PEPDB
!  Date:  23-FEB-1994:03:36:14

coverpage:

  title_1:         TITAN'S ATMOSPHERE AND EVOLUTION THRU DISK RESOLVED SPECTROSCOPY
    sci_cat:       SOLAR SYSTEM
    proposal_for:  GO
    pi_fname:      GEORGE
    pi_mi:         R
    pi_lname:      LEWYCKY
    pi_inst:       MERRILL LYNCH
    pi_phone:      (212) 236-3038
    keywords_1:    ATMOSPHERE, SPECTROSCOPY, EVOLUTION
    keywords_2:    FORMATION
    hours_pri:     1.50
    num_pri:       1
    hrs:           Y
    pi_position:   PROGRAMMER/ANALYST
! end of coverpage

abstract:

    line_1:        By using disk resolved spectroscopy with HST's HRS, a search for
    line_2:        formaldehyde (CH2O) will be performed on Titan.
    line_3:        Formaldehyde is known to serve as an oligomer to Hydrogen Cyan-
    line_4:        ide resulting ultimately in simple precursors, purines and
    line_5:        pyrimidines (e.g., adenine, uracils) necessary for DNA.

!
! end of abstract

general_form_proposers:

  lname:           LEWYCKY
    fname:         GEORGE
    mi:            R
    inst:          MERRILL LYNCH
    country:       USA

!
! end of general_form_proposers block

general_form_text:

  question:        2
    section:       1
    line_1:        With Voyager I's findings over a decade ago of an unique atmosphere
    line_2:        on Saturn's moon Titan, I propose disk spectroscopy of Titan's
    line_3:        atmosphere using HST's GHRS. Information gathered will help in
    line_4:        determining the origin and evolution of Titan's atmosphere. Obser-
    line_5:        vations have never been made in the proposed wavelength regime,
    line_6:        allowing for the discovery of new chemical constituents, most
    line_7:        importantly formaldehyde.

!

  question:        3
    section:       1
    line_1:        This observation consists of a 1.5 hour exposure using the HRS
    line_2:        in the large science aperture with the G270M filter to capture
    line_3:        formaldehyde at 3170 Angstroms.

!

  question:        4
    section:       1
    line_1:        Very fine resolution and specific wavelengths are critical to this
    line_2:        proposal in order to distinguish formaldehyde from other compounds.
    line_3:        A groundbased observation would not be able to find trace amounts
    line_4:        of formaldehyde and other minor species due to distance and inter-
    line_5:        ference of Earth's atmosphere. This proposal requires spectroscopy,
    line_6:        therefore a groundbased observation could not return the required
    line_7:        data.

!

  question:        4
    section:       2
    line_1:        Using Synphot at 2700 A we calculate  .135 counts per second per
    line_2:        diode. For this reason an exposure upwards of one hour is
    line_3:        necessary, although the actual count rate might be optimized at
    line_4:        the central wavelength specified in the exposure logsheet.
    line_5:        Only one target acquisition will be necessary.

!

  question:        7
    section:       1
    line_1:        Data reduction and analysis will be done at STScI with the aid of
    line_2:        a Science Data Analyst. I will use existing resources, such as
    line_3:        STSDAS.

!
!end of general form text

general_form_address:

  lname:           LEWYCKY
    fname:         GEORGE
    mi:            R
    title:         MR.
    category:      PI
    addr_1:        7 DURST DRIVE
    city:          MILLTOWN
    state:         NJ
    zip:           08850
    country:       USA
    phone:         908-846-1216

!
! end of general_form_address records

! No fixed target records found

solar_system_targets:

  targnum:         1
    name_1:        TITAN
    descr_1:       SATELLITE TITAN
    lev1_1:        STD=SATURN
    lev2_1:        STD=TITAN
    comment_1:     OBSERVE TITAN AT GREATEST
    comment_2:     SEPERATION FROM SATURN.
    fluxnum_1:     1
    fluxval_1:     V=8.4

!
! end of solar system targets

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      TITAN
    config:        HRS
    opmode:        ACQ
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  25S
    fluxnum_1:     1
    priority:      1
    param_1:       BRIGHT=RETURN,
    param_2:       SEARCH-SIZE=5
    req_1:         CYCLE 2 /1-4;
    req_2:         ONBOARD ACQ FOR 2;
    req_3:         SEQ 1-4 NO GAP;
    comment_1:     STEP-TIME=1.0S
    comment_2:     EXPECT APPROX. 2700 C/S

!

    linenum:       2.000
    targname:      TITAN
    config:        HRS
    opmode:        ACQ/PEAKUP
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  102S
    fluxnum_1:     1
    priority:      1
    req_1:         ONBOARD ACQ FOR 3;
    comment_1:     STEP TIME=1.0S

!

    linenum:       3.000
    targname:      TITAN
    config:        HRS
    opmode:        IMAGE
    aperture:      2.0
    sp_element:    MIRROR-N2
    num_exp:       1
    time_per_exp:  256 S
    fluxnum_1:     1
    priority:      1
    param_1:       NX = 16,
    param_2:       NY = 16
    comment_1:     STEP TIME=1.0S

!

    linenum:       4.000
    targname:      TITAN
    config:        HRS
    opmode:        ACCUM
    aperture:      2.0
    sp_element:    G270M
    wavelength:    2935
    num_exp:       10
    time_per_exp:  14 M
    fluxnum_1:     1
    priority:      1
    param_1:       FP-SPLIT=STD

!
! end of exposure logsheet

! No scan data records found