! File: 3899C.PROP ! Database: PEPDB ! Date: 19-FEB-1994:23:17:13 coverpage: title_1: TITAN'S NORTH - SOUTH ALBEDO CONTRAST sci_cat: SOLAR SYSTEM sci_subcat: SATELLITES proposal_for: GO cont_id: 3899 pi_fname: PETER pi_mi: H. pi_lname: SMITH pi_inst: UNIVERSITY OF ARIZONA pi_country: USA pi_phone: 602-621-2725 hours_pri: 0.33 num_pri: 1 wf_pc: Y funds_amount: 34581 funds_length: 12 off_fname: MICHAEL off_mi: A. off_lname: CUSANOVICH off_title: VP FOR RESEARCH off_inst: UNIVERSITY OF ARIZONA off_addr_1: ADMINISTRATION BUILDING off_city: TUCSON off_state: AZ off_zip: 85721 off_country: USA off_phone: 602-621-3513 ! end of coverpage abstract: line_1: I propose to obtain a series of high signal-to-noise Titan line_2: images spanning the available filter set from violet to the NIR line_3: in order to study the mysterious north-south albedo contrast line_4: discovered in 1979. It is important to obtain a wide wavelength line_5: coverage for several reasons. The haze optical depth decreases line_6: rapidly longward of 5000A such that redder light penetrates to line_7: deeper and deeper levels within the atmosphere. Hopefully, it will line_8: be possible to probe to the surface by 1 micron. Previous line_9: observations have shown conclusively that the contrast decreases line_10: between 5500A and 6500A. It is also possible that the contrast line_11: reverses polarity at some wavelengths, particularly in the strong line_12: methane band at 8890A. There has never been a simultaneous set of line_13: images taken which compares the violet to the red and NIR as well line_14: as the methane band. This data set will be analyzed and the line_15: effects of the PSF will be removed for comparison with microphysical line_16: models of a haze which is modulated with different incident forcing line_17: functions: seasonal and solar cycle periodicities are of foremost line_18: importance. Variations of the contrast with altitude and time will line_19: be the basis for understanding the complex interaction of Titan's line_20: stratospheric hazes with the solar flux. ! ! end of abstract general_form_proposers: lname: SMITH fname: PETER title: PI mi: H. inst: LUNAR AND PLANETARY LABORATORY country: U.S.A. ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: This proposal requests a single cycle. The observing strategy line_2: minimizes the tape recorder usage by reading out only line_3: 1 CCD frame per exposure (PC6). Eight different exposures, line_4: one per each of the following filters, are taken in close time line_5: proximity. These exposures must be taken within 1 month line_6: of Saturn's opposition while Titan is at least 30" away from line_7: Saturn's disk. I require fine tracking with a guide line_8: tolerance of 0.02" and no preflash. The image of Titan line_9: must be positioned onto an area of PC6 which is known to line_10: be free of blemishes. line_11: F336W 230 sec line_12: F588N 80 line_13: F547M 12 line_14: F439W 50 line_15: F889N 500 line_16: F791W 5 line_17: F1042M 260 line_18: F673N 70 line_19: Total time 1207 = 20 min ! question: 4 section: 1 line_1: The north-south asymmetry has never been observed from line_2: the ground; in fact, the diameter of Titan is less than 1 arcsec line_3: requiring excellent seeing to resolve the disk. Titan's line_4: proximity to Saturn makes the control of scattered light a line_5: problem. All three Pioneer and Voyager flybys of Titan line_6: returned images of Titan which clearly showed the N-S line_7: asymmetry in the 1980 time frame. Three poorly exposed line_8: images were taken from HST in the summer of 1990 as part line_9: of the ERO program and a paper is in press describing the line_10: results. I am a co-author on this paper. These observations line_11: were not of high quality because of the lack of tracking line_12: capabilities at that time. ! question: 5 section: 1 line_1: No special scheduling is required. ! question: 6 section: 1 line_1: There are no special requirements of these types. ! question: 7 section: 1 line_1: Images will be deconvolved using the best available PSFs line_2: and the results will be analyzed for north-south line_3: asymmetry. ! question: 8 section: 1 line_1: No additional comments. ! question: 9 section: 1 line_1: I have received a small grant under my cycle 1 proposal, line_2: "Titan's North-South Albedo Contrast" (#2562), to line_3: analyze the ERO observations taken in August, 1990. line_4: These images fall short of having the required quality to line_5: meet the goals of this proposal. ! question: 10 section: 1 line_1: The Planetary Image Research Lab (PIRL) is available for line_2: this project; it can support STSDAS and IRAF as well as line_3: provide terminals for image processing. There are also line_4: qualified students who can be hired to work on this project. line_5: One thing that is lacking is disk space to use for storing line_6: images and processing files. ! !end of general form text general_form_address: lname: SMITH fname: PETER mi: H. category: PI inst: LUNAR AND PLANETARY LABORATORY addr_1: UNIVERSITY OF ARIZONA city: TUCSON state: AZ zip: 85721 country: USA phone: 602-621-2725 telex: 602-621-4933 ! ! 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" comment_1: SEPARATION NEEDED TO KEEP SATURN comment_2: OUT OF FOV. 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: PC opmode: IMAGE aperture: PC6-FIX sp_element: F336W num_exp: 1 time_per_exp: 500S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO req_1: PCS C / 1-8; req_2: GROUP 1-8 NO GAP; req_3: CYCLE 2 / 1-8; req_4: POS TARG 3.7, 2.7 / 1-8; req_5: AT 10-AUG-92 +/- 30D; comment_4: READ OUT ONLY PC6. ! linenum: 2.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F588N num_exp: 1 time_per_exp: 100S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! linenum: 3.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F547M num_exp: 1 time_per_exp: 10S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! linenum: 4.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F439W num_exp: 1 time_per_exp: 50S s_to_n: 80 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! linenum: 5.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F889N num_exp: 1 time_per_exp: 500S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! linenum: 6.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F791W num_exp: 1 time_per_exp: 4S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! linenum: 7.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F850LP num_exp: 1 time_per_exp: 60S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! linenum: 8.000 targname: TITAN config: PC opmode: IMAGE aperture: PC6-FIX sp_element: F673N num_exp: 1 time_per_exp: 70S s_to_n: 100 fluxnum_1: 1 priority: 1 param_1: PRE-FLASH=NO comment_1: READ OUT ONLY PC6. ! ! end of exposure logsheet ! No scan data records found