! File: 4972C.PROP ! Database: PEPDB ! Date: 23-FEB-1994:13:08:17 coverpage: title_1: OPPORTUNITY OCCULTATIONS BY SMALL BODIES - CYC3HIGH,A sci_cat: SOLAR SYSTEM proposal_for: GTO/HSP targ_of_opp: Y cont_id: 1079 pi_fname: ROBERT pi_mi: C. pi_lname: BLESS pi_inst: WISCONSIN, UNIVERSITY OF pi_country: USA pi_phone: (608)262-1715 keywords_1: COMET, ASTEROID, SATELLITE, PLUTO, OCCULTATION hours_pri: 9.47 num_pri: 5 realtime: X time_crit: Y ! end of coverpage abstract: line_1: Although an occultation by any specific comet, line_2: asteroid, satellite, or Pluto is unlikely to be line_3: observable from the ST, the scientific return from line_4: such an event would be great because of the superior line_5: signal-to-noise ratio achievable with the ST for line_6: occultation observations. We propose to observe line_7: occultations by these bodies with the ST, as the line_8: opportunites arise, to probe their atmospheres, line_9: determine their sizes and achieve other goals. With line_10: such diverse possibilities, one must examine each line_11: opportunity as it occurs and formulate an observing line_12: strategy to fit that particular case. Revision line_13: History: Prepared for future cycles submission--ASB line_14: 4/24/92; cycle 2 changes, ASB 1/24/93; ! ! end of abstract general_form_proposers: lname: ROBINSON fname: EDWARD mi: L. inst: TEXAS, UNIVERSITY OF country: USA ! lname: BLESS fname: ROBERT mi: C. inst: WISCONSIN, UNIVERSITY OF country: USA ! lname: VAN CITTERS fname: G. mi: W. inst: NATIONAL SCIENCE FOUNDATION country: USA ! lname: DOLAN fname: JOSEPH mi: F. inst: NASA, GODDARD SPACE FLIGHT CENTER country: USA ! lname: WHITE fname: RICHARD mi: L. inst: SPACE TELESCOPE SCIENCE INSTITUTE country: USA ! lname: ELLIOT fname: JAMES mi: L. inst: MASSACHUSETTS INSTITUTE OF TECHNOLOGY country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We plan to identify those occultations of sufficient line_2: signal-to-noise ratio to achieve the goals outlined line_3: in Section 2. Each observation will require (i) line_4: onboard acquisition to verify the guide stars; line_5: and (ii) a time series run on the object with line_6: whatever filter aperture combination that is chosen line_7: for the observation. For some occultations to be line_8: observed in the far UV, prior multi-filter line_9: photometry of the object will be necessary in order line_10: to determine the most appropriate filter to use for line_11: the occultation. For now, we shall assume that the line_12: calibration and observation time will average about line_13: 60 minutes per occultation observed. ! question: 4 section: 1 line_1: We can achieve a much better signal-to-noise ratio line_2: for the temperature profiles and other information line_3: than can be obtained for small body occultations line_4: than has been possible from the ground for the line_5: following reasons: (i) the greatly improved line_6: photometric stability of ST photometry, which will line_7: substantially reduce the errors in the numerical line_8: inversion of the data that is necessary to obtain line_9: the temperature profiles; (ii) our ability to reject line_10: background light from the occulting object (such as line_11: a comet ) by employing small focal plane apertures; line_12: and (iii) the absence of scintillation noise, which line_13: has strong components at frequencies comparable to line_14: the occultation timescale. ! question: 7 section: 1 line_1: Data will be reduced and analyzed at MIT with DEC line_2: 5000 belonging to the planetary astronomy group. ! question: 10 section: 1 line_1: TBD ! question: 13 section: 1 line_1: An observation of an occultation by a comet, line_2: asteroid, satellite, or Pluto would yield a variety line_3: of information. For example, we could gain further line_4: information about the atmospheres of Pluto and line_5: Triton, including knowledge of the composition and line_6: structure of their atmospheres. Also, the presence line_7: of possible material in the neighborhood of an line_8: asteroid could be obtained. Opportunity stellar line_9: occultations by small bodies are proposed to be line_10: observed with the HSP or FOS. ! !end of general form text general_form_address: lname: BLESS fname: ROBERT mi: C. category: PI inst: UNIVERSITY OF WISCONSIN addr_1: DEPARTMENT OF ASTRONOMY addr_2: 475 NORTH CHARTER STREET city: MADISON state: WI zip: 53706 country: USA phone: 608-262-1715 ! ! end of general_form_address records fixed_targets: targnum: 10 name_1: TR60 name_2: GSC6309-01811 descr_1: STAR TO BE OCCULTED BY TRITON. descr_2: CLOSE APPROACH AT 10-JUL-93:22:18 pos_1: PLATE-ID = 01O4, pos_2: RA = 19H 25M 37.380S +/- 0.02", pos_3: DEC = -21D 17' 32.32" +/- 0.07", equinox: J2000 acqpr_1: BKG comment_1: SOLAR ELONG 179D fluxnum_1: 1 fluxval_1: R = 13.9 +/- 0.5 ! targnum: 11 name_1: TR60-OFFSET name_2: GSC6309-01437 descr_1: OFFSET TARGET FOR TR60 pos_1: PLATE-ID = 01O4, pos_2: RA = 19H 25M 39.898S +/- 0.04", pos_3: DEC = -21D 17' 53.14" +/- 0.08", equinox: J2000 fluxnum_1: 1 fluxval_1: R = 14.9 +/- 0.1 ! targnum: 14 name_1: P20-03 name_2: GSC5031-00470 descr_1: STAR TO BE OCCULTED BY PLUTO. descr_2: CLOSE APPROACH AT 4-FEB-94:21:40 pos_1: PLATE-ID = 03UU, pos_2: RA = 15H 55M 19.745S +/- 0.2", pos_3: DEC = -6D 4' 51.31" +/- 0.2", equinox: J2000 acqpr_1: BKG comment_1: STAR POSITION WILL BE UPDATED comment_2: BETWEEN 1.5 AND 4 MONTHS BEFORE comment_3: OCCULTATION DATE. comment_4: CONTACT: AMANDA S. BOSH, MIT comment_5: SOLAR ELONG 78D fluxnum_1: 1 fluxval_1: R = 12.0 +/- 0.5 ! targnum: 15 name_1: P20-03-OFFSET name_2: STAR-155519-060400 descr_1: OFFSET TARGET FOR P20-03 pos_1: RA = 15H 55M 19.251S +/- 0.2", pos_2: DEC = -6D 4' 0.04" +/- 0.2", equinox: J2000 comment_1: STAR POSITION WILL BE UPDATED comment_2: BETWEEN 1.5 AND 4 MONTHS BEFORE comment_3: OCCULTATION DATE. comment_4: CONTACT: AMANDA S. BOSH, MIT fluxnum_1: 1 fluxval_1: R = 15.0 +/- 0.5 ! targnum: 16 name_1: GSC5809-00117 descr_1: STAR TO BE OCCULTED BY TITAN. descr_2: CLOSE APPROACH AT 5-JUL-93:02:40 pos_1: PLATE-ID = 044F, pos_2: RA = 22H 09M 51.884S +/- 0.03", pos_3: DEC = -12D 49' 41.04" +/- 0.06", equinox: J2000 acqpr_1: BKG comment_1: SOLAR ELONG 133D fluxnum_1: 1 fluxval_1: B = 13.1 +/- 0.5 ! targnum: 17 name_1: 00117-OFFSET name_2: STAR-2210-1249 descr_1: OFFSET TARGET FOR GSC5809-00117 pos_1: RA = 22H 09M 49.310S +/- 0.03", pos_2: DEC = -12D 49' 27.97" +/- 0.06", equinox: J2000 fluxnum_1: 1 fluxval_1: B = 16.1 +/- 0.1 ! targnum: 18 name_1: GSC5801-00585 descr_1: STAR TO BE OCCULTED BY TITAN. descr_2: CLOSE APPROACH AT 22-SEP-93:5:41 pos_1: PLATE-ID = 00CT, pos_2: RA = 21H 50M 05.959S +/- 0.04", pos_3: DEC = -14D 43' 03.45" +/- 0.02", equinox: J2000 acqpr_1: BKG comment_1: SOLAR ELONG 145D fluxnum_1: 1 fluxval_1: B = 11.1 +/- 0.5 ! targnum: 19 name_1: 00585-OFFSET name_2: GSC5801-00481 descr_1: OFFSET TARGET FOR GSC5801-00585 pos_1: PLATE-ID = 00CT, pos_2: RA = 21H 50M 03.746S +/- 0.04", pos_3: DEC = -14D 42' 54.87" +/- 0.04", equinox: J2000 fluxnum_1: 1 fluxval_1: B = 14.1 +/- 0.1 ! targnum: 20 name_1: GSC5813-00693 descr_1: STAR TO BE OCCULTED BY TITAN. descr_2: CLOSE APPROACH AT 6-JUN-94:06:00 pos_1: PLATE-ID = 02NW, pos_2: RA = 22H 56M 56.356S +/- 0.05", pos_3: DEC = -8D 32' 10.06" +/- 0.04", equinox: J2000 acqpr_1: BKG comment_1: SOLAR ELONG 93D fluxnum_1: 1 fluxval_1: B = 13.5 +/- 0.5 ! targnum: 21 name_1: 00693-OFFSET name_2: STAR-2257-0833 descr_1: OFFSET TARGET FOR GSC5813-00693 pos_1: RA = 22H 56M 57.514S +/- 0.05", pos_2: DEC = -8D 32' 31.28" +/- 0.05", equinox: J2000 fluxnum_1: 1 fluxval_1: B = 16.1 +/- 0.1 ! ! end of fixed targets solar_system_targets: targnum: 25 name_1: 00117-BACKGROUND descr_1: OFFSET TITAN lev1_1: STD = TITAN lev2_1: TYPE = POS_ANGLE, lev2_2: RAD = 7.5, lev2_3: ANG = 71, lev2_4: REF = NORTH comment_1: FOR USE IN A SCAN OF comment_2: BACKGROUND LEVELS ALONG comment_3: THE PATH OF THE OCCULTED STAR ! targnum: 30 name_1: TITAN-CENTER descr_1: SATELLITE TITAN lev1_1: STD = TITAN, ACQ = 0.1 comment_1: ACQUISITION TARGET FOR comment_2: BACKGROUND SCANS fluxnum_1: 1 fluxval_1: V = 8.3 +/- 0.5 ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 4.000 sequence_1: DEFINE sequence_2: ONBRD-ACQ targname: # config: HSP/VIS opmode: ACQ num_exp: 1 time_per_exp: 1S fluxnum_1: 1 priority: 1 ! linenum: 6.000 sequence_1: DEFINE sequence_2: BACK-SCAN targname: # config: HSP/PMT/VIS opmode: SPLIT aperture: 1.0 sp_element: F750W/F320N num_exp: 1 time_per_exp: 1S fluxnum_1: 1 priority: 1 param_1: # req_1: SPATIAL SCAN; ! linenum: 7.000 sequence_1: DEFINE sequence_2: RING-OCC targname: # config: HSP/PMT/VIS opmode: SPLIT aperture: 1.0 sp_element: F750W/F320N num_exp: 1 time_per_exp: 1M fluxnum_1: 1 priority: 1 param_1: # ! linenum: 7.500 sequence_1: DEFINE sequence_2: RING-OCC targname: ^ config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: ^ priority: 1 param_1: FORMAT=FN, req_1: PAR WITH 7.0; comment_1: CAPTURE FGS TLM DURING OCCULTATION. ! linenum: 10.040 sequence_1: USE sequence_2: ONBRD-ACQ targname: TR60-OFFSET time_per_exp: X120 req_1: ONBOARD ACQ FOR 10.10; req_2: SEQ 10.04 - 10.10 NO GAP; req_3: PCS MODE F / 10.04 - 10.10; req_4: CYCLE 2 / 10.04 - 10.10; comment_1: USE FINE LOCK FOR OBSERVATION IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 10.100 sequence_1: USE sequence_2: RING-OCC targname: TR60 time_per_exp: X60 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 100, param_4: VIS-ANALOG = 100, req_1: AT 10-JUL-93:21:49 +/- 1M; req_2: CRIT OBS; comment_1: END EXPOSURE AT 10-JUL-93:22:49. comment_2: OCCULTATION TIME UNCERTAIN. TIME comment_3: WILL BE UPDATED BETWEEN 1.5 AND 4 comment_4: MONTHS PRIOR TO OBSERVATION. comment_5: CONTACT: AMANDA S. BOSH, MIT ! linenum: 12.040 sequence_1: USE sequence_2: ONBRD-ACQ targname: P20-03-OFFSET time_per_exp: X120 req_1: ONBOARD ACQ FOR 12.10; req_2: SEQ 12.04 - 12.10 NO GAP; req_3: PCS MODE F / 12.04 - 12.10; req_4: CYCLE 2 / 12.04 - 12.10; comment_1: USE FINE LOCK FOR OBSERVATION IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 12.100 sequence_1: USE sequence_2: RING-OCC targname: P20-03 time_per_exp: X60 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 100, param_4: VIS-ANALOG = 100, req_1: AT 4-FEB-94:21:11 +/- 1M; req_2: CRIT OBS; comment_1: END EXPOSURE AT 4-FEB-94:22:10. ! linenum: 13.000 sequence_1: USE sequence_2: ONBRD-ACQ targname: TITAN-CENTER time_per_exp: X1 req_1: ONBOARD ACQ FOR 13.01; req_2: SEQ 13.00 - 13.01 NO GAP; req_3: CYCLE 2 / 13.00 - 13.28; ! linenum: 13.010 sequence_1: USE sequence_2: BACK-SCAN targname: 00117-BACKGROUND time_per_exp: X200 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, req_1: SEQ 13.01 - 13.03; req_2: GROUP 13.01 - 13.04 WITHIN 9H; ! linenum: 13.020 sequence_1: USE sequence_2: BACK-SCAN targname: 00117-BACKGROUND time_per_exp: X200 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, ! linenum: 13.030 sequence_1: USE sequence_2: BACK-SCAN targname: 00117-BACKGROUND time_per_exp: X200 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, ! linenum: 13.040 sequence_1: USE sequence_2: ONBRD-ACQ targname: 00117-OFFSET time_per_exp: X180 req_1: ONBOARD ACQ FOR 13.10; req_2: SEQ 13.04 - 13.10 NO GAP; req_3: PCS MODE F / 13.04 - 13.10; comment_1: USE FINE LOCK FOR OBSERVATION IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 13.100 sequence_1: USE sequence_2: RING-OCC targname: GSC5809-00117 time_per_exp: X60 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, req_1: AT 5-JUL-93:02:11 +/- 1M; req_2: CRIT OBS; comment_1: END EXPOSURE AT 5-JUL-93:03:10. ! linenum: 13.250 sequence_1: USE sequence_2: ONBRD-ACQ targname: TITAN-CENTER time_per_exp: X1 req_1: ONBOARD ACQ FOR 13.26; req_2: SEQ 13.25 - 13.26 NO GAP; ! linenum: 13.260 sequence_1: USE sequence_2: BACK-SCAN targname: 00117-BACKGROUND time_per_exp: X200 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, req_1: SEQ 13.26 - 13.28; req_2: GROUP 13.10 - 13.28 WITHIN 9H; ! linenum: 13.270 sequence_1: USE sequence_2: BACK-SCAN targname: 00117-BACKGROUND time_per_exp: X200 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, ! linenum: 13.280 sequence_1: USE sequence_2: BACK-SCAN targname: 00117-BACKGROUND time_per_exp: X200 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, ! linenum: 14.040 sequence_1: USE sequence_2: ONBRD-ACQ targname: 00585-OFFSET time_per_exp: X40 req_1: ONBOARD ACQ FOR 14.10; req_2: SEQ 14.04 - 14.10 NO GAP; req_3: PCS MODE F / 14.04 - 14.10; req_4: CYCLE 2 / 14.04 - 14.10; comment_1: USE FINE LOCK FOR OBSERVATION IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 14.100 sequence_1: USE sequence_2: RING-OCC targname: GSC5801-00585 time_per_exp: X60 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, req_1: AT 22-SEP-93:05:12 +/- 1M; req_2: CRIT OBS; comment_1: END EXPOSURE AT 22-SEP-93:06:11. ! linenum: 15.040 sequence_1: USE sequence_2: ONBRD-ACQ targname: 00693-OFFSET time_per_exp: X180 req_1: ONBOARD ACQ FOR 15.10; req_2: SEQ 15.04 - 15.10 NO GAP; req_3: PCS MODE F / 15.04 - 15.10; req_4: CYCLE 2 / 15.04 - 15.10; comment_1: USE FINE LOCK FOR OBSERVATION IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 15.100 sequence_1: USE sequence_2: RING-OCC targname: GSC5813-00693 time_per_exp: X60 param_1: SAMPLE-TIME = 0.01, param_2: DATA-FORMAT = ALL, param_3: PMT-ANALOG = 1000, param_4: VIS-ANALOG = 100, req_1: AT 6-JUN-94:05:31 +/- 1M; req_2: CRIT OBS; comment_1: END EXPOSURE AT 6-JUN-94:06:30. ! ! end of exposure logsheet scan_data: line_list: 13.01, 13.03, 13.26, 13.28 fgs_scan: cont_dwell: C dwell_pnts: 0 dwell_secs: 0.00 scan_width: 0.0000 scan_length: 15.0000 sides_angle: 90.0000 number_lines: 1 scan_rate: 0.0750 first_line_pa: 251.0000 scan_frame: CEL len_offset: 0. wid_offset: 0 ! line_list: 13.02, 13.27 fgs_scan: cont_dwell: C dwell_pnts: 0 dwell_secs: 0.00 scan_width: 1.0000 scan_length: 15.0000 sides_angle: 90.0000 number_lines: 3 scan_rate: 0.0750 first_line_pa: 251.0000 scan_frame: CEL len_offset: 0. wid_offset: 0.5 ! ! end of scan data