! File: 2926C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:22:12:15 coverpage: title_1: HST OBSERVATIONS OF COMET AUSTIN (1989C1) sci_cat: SOLAR SYSTEM proposal_for: DD pi_title: DR. pi_fname: HAROLD pi_mi: A. pi_lname: WEAVER pi_inst: STSCI pi_country: USA pi_phone: 301-338-4765 keywords_1: COMET hours_pri: 5.67 num_pri: 1 wf_pc: X time_crit: X funds_date: NOV-90 pi_position: DR. off_fname: H. off_mi: S. off_lname: STOCKMAN off_title: DEPUTY DIRECTOR off_inst: SPACE TELESCOPE SCIENCE INSTITUTE off_addr_1: 3700 SAN MARTIN DRIVE off_city: BALTIMORE off_state: MD off_zip: 21218 off_country: USA off_phone: 301-338-4730 ! end of coverpage abstract: line_1: Comet Austin (1989c1) is a bright, new comet that passes line_2: very close to the Earth in May, 1990. Imaging observations line_3: of this comet by HST will provide unprecedented spatial line_4: resolution of the near nucleus region. WFPC images of line_5: the comet should be obtained as often as possible during line_6: the OV period. The optimum observing period is May 25, 1990 line_7: +/- two weeks (approximately). ! ! end of abstract general_form_proposers: lname: WEAVER fname: HAROLD title: P.I. mi: A. inst: STSCI country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: These observations will be executed in the "point and shoot" line_2: mode. No tracking of this target will be attempted. The line_3: HST will be commanded to point at a particular (RA,DEC) at line_4: a particular time. In this sense, the four different science line_5: exposures will be treated as pointings at four different line_6: targets. For the first pointing, GS acq to COARSE TRACK line_7: is requested. Following the first exposure, break GS lock line_8: and slew to the next position (the second pointing). All line_9: subsequent exposures will be under gyro control only. The line_10: four science exposures naturally form a "group", but one line_11: or more exposure may be dropped if all exposures cannot be line_12: fit into one observability window. This group of exposures line_13: should be repeated as often as possible during the line_14: observability window. ! question: 6 section: 1 line_1: These observations are possible only during a two week line_2: window centered on May 25, 1990. ! question: 8 section: 1 line_1: These observations occur during OV. Since this comet is "new", line_2: updates to the orbital elements should be performed at the line_3: latest possible time. Since the comet passes relatively close line_4: to the Earth, the parallax correction is roughly 78 arcsec. line_5: Care must be exercised to ensure that the parallax correction line_6: is done properly. ! !end of general form text general_form_address: lname: WEAVER fname: HAROLD mi: A. title: DR. category: PI inst: SPACE TELESCOPE SCIENCE INSTITUTE addr_1: 3700 SAN MARTIN DR. city: BALTIMORE state: MD zip: 21218 country: USA ! ! end of general_form_address records ! No fixed target records found solar_system_targets: targnum: 1 name_1: COMET-AUSTIN-1989C1 descr_1: COMET AUSTIN 1989C1 lev1_1: TYPE = COMET, Q = 0.3497735, lev1_2: E = 1.0002278, I = 58.95559, lev1_3: O = 75.22965, W = 61.56934, lev1_4: T = 09-APR-90:23:13:03, lev1_5: EQUINOX = B1950, lev1_6: EPOCH = 19-APR-90 wind_1: RANGE COMET-AUSTIN-1989C1 EARTH LT 0.36 comment_1: OPTIMUM OBSERVING TIME IS NEAR comment_2: CLOSEST APPROACH TO EARTH. comment_3: NOMINALLY THIS WILL OCCUR comment_4: DURING LATTER HALF OF MAY. comment_5: TOTAL COMA VISUAL MAGNITUDE SHOULD comment_6: BE ABOUT 3.5 DURING THE TIME OF comment_7: OBSERVATIONS BUT THIS IS comment_8: UNCERTAIN. fluxnum_1: 1 fluxval_1: SURF(V) = 13 +/- 1 fluxnum_2: 2 fluxval_2: SIZE = 0.4 ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE sequence_2: IMAGE targname: COMET-AUSTIN-1989C1 config: WFC opmode: IMAGE aperture: ALL sp_element: F791W num_exp: 1 time_per_exp: 0.11 S s_to_n: 85 fluxnum_1: 1 fluxnum_2: 2 priority: 1 param_1: PRE-FLASH=YES req_1: SEQ 1-4 NON-INT comment_1: EL 1-4 FORM A GROUP BUT SOME CAN BE comment_2: DROPPED IF ALL CANNOT FIT IN ONE comment_3: ORBIT. OPTIMUM DATE FOR COMET comment_4: OBS IS MAY 25. WINDOW OPENS ON MAY comment_5: 13 AND CLOSES ON JUNE 10 (APPROX). ! linenum: 2.000 sequence_1: DEFINE sequence_2: IMAGE targname: COMET-AUSTIN-1989C1 config: WFC opmode: IMAGE aperture: ALL sp_element: F791W num_exp: 1 time_per_exp: 0.5 S s_to_n: 180 fluxnum_1: 1 fluxnum_2: 2 priority: 2 param_1: PRE-FLASH=YES comment_1: THIS PROPOSAL ASSUMES THAT comment_2: THE TEC IS ON. IF THE CCD comment_3: IS STILL WARM, THEN USE comment_4: PROPOSAL 2963 INSTEAD OF comment_5: THIS PROPOSAL. ! linenum: 3.000 sequence_1: DEFINE sequence_2: IMAGE targname: COMET-AUSTIN-1989C1 config: WFC opmode: IMAGE aperture: ALL sp_element: F791W num_exp: 1 time_per_exp: 2 S s_to_n: 180 fluxnum_1: 1 fluxnum_2: 2 priority: 3 param_1: PRE-FLASH=YES ! linenum: 4.000 sequence_1: DEFINE sequence_2: IMAGE targname: COMET-AUSTIN-1989C1 config: WFC opmode: IMAGE aperture: ALL sp_element: F439W num_exp: 1 time_per_exp: 0.5 S s_to_n: 68 fluxnum_1: 1 fluxnum_2: 2 priority: 4 param_1: PRE-FLASH=YES ! linenum: 5.000 sequence_1: USE IMAGE comment_1: IDEA HERE IS TO GET AS MANY IMAGES comment_2: AS POSSIBLE. EVEN ONE EXECUTION OF comment_3: THE SEQUENCE WILL SATISFY THE comment_4: MINIMUM GOALS OF THE PROGRAM, BUT comment_5: MULTIPLE EXECUTIONS ARE DESIRABLE. ! linenum: 6.000 sequence_1: USE IMAGE ! linenum: 7.000 sequence_1: USE IMAGE ! linenum: 8.000 sequence_1: USE IMAGE ! linenum: 9.000 sequence_1: USE IMAGE ! linenum: 10.000 sequence_1: USE IMAGE ! linenum: 11.000 sequence_1: USE IMAGE ! linenum: 12.000 sequence_1: USE IMAGE ! linenum: 13.000 sequence_1: USE IMAGE ! linenum: 14.000 sequence_1: USE IMAGE ! ! end of exposure logsheet ! No scan data records found