!  File:  1289C.PROP
!  Database:  PEPDB
!  Date:  16-FEB-1994:10:24:40

coverpage:

  title_1:         STRUCTURE AND COMPOSITION OF TITAN'S ATMOSPHERE:CYCLE 1
    sci_cat:       SOLAR SYSTEM
    sci_subcat:    MINOR PLANETS
    proposal_for:  GTO/OS
    pi_fname:      JOHN
    pi_mi:         J.
    pi_lname:      CALDWELL
    pi_inst:       YORK UNIVERSITY
    pi_country:    CANADA
    pi_phone:      (416) 665-5449
    keywords_1:    TITAN, ATMOSPHERIC CHEMISTRY
    hours_pri:     3.00
    num_pri:       1
    pi_position:   PROFESSOR
! end of coverpage

abstract:

    line_1:        Titan will be observed both with ultraviolet imaging and spectroscopy.
    line_2:        The ultraviolet imaging is to look for very high altitude atmospheric
    line_3:        structure that might be associated with details of the UV spectroscopy.
    line_4:        The UV spectroscopy will include a search for discrete absorption
    line_5:        features and continuum Rayleigh scattering.  Rayleigh scattering has
    line_6:        not previously been detected from Titan, despite the very thick
    line_7:        atmosphere there, because of strong absorption by quasi-organic
    line_8:        material.

!
! end of abstract

general_form_proposers:

  lname:           CALDWELL
    fname:         JOHN
    mi:            J.
    inst:          YORK UNIVERSITY
    country:       CANADA

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       0
    line_1:        The observations include one FOC image, using two filters to block the red
    line_2:        leak.  The effective wavelength will be about 2400A, just shortward of the
    line_3:        mid-range of the two FOS spectra, G270H and G190H.  Complex hydrocarbons
    line_4:        such as C2H4 will be sought.

!

  question:        4
    section:       0
    line_1:        ST observations are required for their high spatial resolution, and for access
    line_2:        to the ultraviolet between 2000 and 3000 A. Ground-based observations are
    line_3:        completely irrelevant to this study.

!

  question:        6
    section:       0
    line_1:        There are no special requirements of these types.

!

  question:        7
    section:       0
    line_1:        The image will be examined for suggestions of contrast features at all
    line_2:        wavelengths, and will be compared to earlier Voyager images.The spectra will
    line_3:        be divided by a published Solar spectrum to generate an albedo curve, which
    line_4:        will be examined for discrete absorption features. The
    line_5:        continuum reflectivity will also be compared to atmospheric models. It should
    line_6:        be possible to estimate the altitude of the ultraviolet absorbing layer,
    line_7:        because the continuum opacity, Rayleigh scattering, can be modelled
    line_8:        very accurately.

!

  question:        8
    section:       0
    line_1:        There are no special requirements

!

  question:        10
    section:       0
    line_1:        We have access to dedicated SUN4/280 computer system for ST data
    line_2:        analysis.

!

  question:        13
    section:       1
    line_1:        Ultraviolet spectroscopy and imaging of
    line_2:        Tital will be obtained. The imaging complements the Voyager data set, at a
    line_3:        different wavelength, where the atmosphere is known to absorb very strongly.
    line_4:        The spectra will be analyzed for discrete absorptionfeatures.

!
!end of general form text

general_form_address:

  lname:           CALDWELL
    fname:         JOHN
    mi:            J.
    title:         DR.
    category:      PI
    inst:          YORK UNIVERSITY
    addr_1:        PHYSICS DEPARTMENT
    city:          NORTH YORK
    state:         ON
    zip:           M3J 1P3
    country:       CANADA
    phone:         (416) 665-5449

!
! 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
    wind_1:        SEP OF TITAN SATURN FROM EARTH GT 30"
    fluxnum_1:     1
    fluxval_1:     V=8.4
    fluxnum_2:     2
    fluxval_2:     F(2200)=4.5E-15
    fluxnum_3:     3
    fluxval_3:     F(2000)=5E-16

!
! end of solar system targets

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      TITAN
    config:        FOS/BL
    opmode:        ACQ/FIRMWARE
    aperture:      1.0
    sp_element:    MIRROR
    wavelength:    2230-3309
    num_exp:       1
    time_per_exp:  0.96S
    fluxnum_1:     1
    priority:      1
    param_1:       MAP=COARSE,
    param_2:       BRIGHT=327700,
    param_3:       FAINT=6554,
    req_1:         GUID TOL 0.04"; SEQ 1-5
    req_2:         NO GAP; CYCLE 1 / 1-5;
    req_3:         ONBOARD ACQ FOR 4-5;

!

    linenum:       4.000
    targname:      TITAN
    config:        FOS/BL
    opmode:        ACCUM
    aperture:      1.0
    sp_element:    G270H
    wavelength:    2230-3309
    num_exp:       1
    time_per_exp:  25.2M
    s_to_n:        50
    fluxnum_1:     2
    priority:      1
    req_1:         GUID TOL 0.04"

!

    linenum:       4.050
    targname:      TITAN
    config:        FOS/BL
    opmode:        ACCUM
    aperture:      1.0
    sp_element:    G190H
    wavelength:    1900
    num_exp:       1
    time_per_exp:  25.2M
    s_to_n:        20
    fluxnum_1:     2
    priority:      1
    req_1:         GUID TOL 0.04"

!

    linenum:       4.100
    targname:      TITAN
    config:        FOS/BL
    opmode:        ACQ
    aperture:      1.0
    sp_element:    MIRROR
    wavelength:    2230-3309
    num_exp:       1
    time_per_exp:  3.84S
    fluxnum_1:     1
    priority:      1
    req_1:         GUID TOL 0.04";
    req_2:         SEQ 4-4.1 NO GAP;

!

    linenum:       5.000
    targname:      TITAN
    config:        FOC/96
    opmode:        IMAGE
    aperture:      512X512
    sp_element:    F220W,F231M
    num_exp:       1
    time_per_exp:  25.2M
    s_to_n:        20
    fluxnum_1:     2
    priority:      1
    req_1:         GUID TOL 0.04";

!
! end of exposure logsheet

! No scan data records found