! File: 2771C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:12:09:50 coverpage: title_1: HSP STELLAR OCCULTATION BY PLANETARY RINGS HSP-09A sci_cat: SOLAR SYSTEM proposal_for: SV/HSP pi_fname: ROBERT pi_mi: C. pi_lname: BLESS pi_inst: UNIV.OF WISCONSIN pi_country: USA pi_phone: 608-262-1715 hours_pri: 3.00 num_pri: 1 hsp: Y time_crit: Y pi_position: PROFESSOR off_inst: UNIV OF WISCONSIN off_city: MADISON off_state: WI off_zip: 53706 off_phone: 608-262-1715 ! end of coverpage abstract: line_1: This proposal defines the procedure for the verification of the line_2: occultation mode of observation on the HSP using the beamsplitter line_3: to simultaneously observe with both IDT#3(VIS) and the PMT. This line_4: test verifies many procedures employed by all occultation observa- line_5: tions, through observation of an occultation by a planetary ring line_6: system. The effect line_7: of the HSP motion on the predicted times of the occultation events line_8: minimal. The immersion of a star will be observed for Saturn line_9: while tracking on the star. line_11: Revision: line_12: EER 6/9/89 RPSS V 7.0 Local & RPS; asb @ MIT Jul 28, 1989 14:30; line_13: rlw @ STScI Aug 8, 1989 10:30; asb @ MIT Aug 11, 1989 15:00; line_14: SAL-M 8/15/89 RPSS V7.2 : Changed INT-ACQ to ONBRD-ACQ & other changes; line_15: Changed PMT dark target - SALM 10/12/89; asb @ MIT 19 Mar 1990 13:30: line_16: updated target list; asb @ MIT 17 May 1990 11:00: additional line_17: targets for SV; pstanley - New RPSS version 5/30/90; Fixed for aberration line_18: problem - asb @ MIT 27 July 1990; Changes to targets/observations--amanda; line_19: Fixed small syntax error (must specify cycle parameter)--BJW 5/10/91; line_20: Changes to observing strategies per 6/4/91 meeting - ps ! ! end of abstract general_form_proposers: lname: BLESS fname: ROBERT title: PROF inst: UNIV OF WISCONSIN country: USA ! lname: ELLIOT fname: J inst: M I T country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: The purpose of this test is to verify the occultation mode on the HSP line_2: using the beamsplitter to simultaneously obtain two-color observations line_3: with the visual IDT (IDT#3) and the PMT. Additionally, the test line_4: specifically supplies the following essential verifications: line_5: 1) Tests the ability of the HST to acquire a star near a line_6: bright planet using two sequential onboard target acquisitions line_7: while the star is still far from the occulting planet. line_9: 2) Measures the direct and scattered light essential for planned line_10: GTO programs. line_11: 3) Check of HSP photometry and data handling in occultation mode. line_12: 4) Comparison of observed to calculated predictions to an accuracy of line_13: +/- 0.2 sec using ground-based observations of same event if line_14: available, establishing the ST/HSP time relatability to UTC. ! question: 3 section: 1 line_1: The proposed observations will use the HSP configured in the HSP/PMT line_2: mode requiring single aperture, two detector mode (VIS and the PMT). line_3: The observing program will use Saturn as target. line_4: Planetary ring occultation: line_5: 1) Acquire external "darks", using a dark portion of the sky as a standard line_6: calibration source within 3 days of the occultation event. line_7: 2) Acquire occultation offset star, using on onboard acquisition line_8: raster scan. line_9: 3) Perform second acquisition exposure, using results of previous line_10: acquisition as input. This will improve the accuracy of the line_11: target acquisition. (This is done automatically) line_12: 4) Scan along path the star will take during the occultation. line_13: 5) Start continuous series of 10 ms integrations for line_14: approximately 10 minutes prior to the predicted ring line_15: immersion and run for approximately 70 minutes (varies depending line_16: on target). ! question: 6 section: 1 line_1: Upon placing the star in the beamsplitter aperture and beginning the line_2: integration, the immersion sequence must be uninterrupted as the line_3: occultation is time critical. ! question: 7 section: 1 line_1: The scattered and direct light measurements from the planetary ring line_2: system will be tabulated for future use in determining what stars line_3: will be bright enough to provide useful occultation data. The ring line_4: occultation times and the HST orbital parameters will be used with line_5: current kinematical models to evaluate the precision of HSP occulta- line_6: tion photometry and the accuracy of HST timing and orbital positions. ! question: 8 section: 1 line_1: The observations are inherently time-critical and uninterruptable. line_2: It is thus anticipated that use of the onboard tape recorder line_3: may be necessary to store the data stream. line_4: Simultaneous ground-based observations are highly desirable to line_5: provide an independent verification of the spacecraft clock and line_6: post-observation spacecraft position in orbit. ! question: 10 section: 1 line_1: Data reduction and analysis will be supported on computer line_2: facilities at MIT. ! !end of general form text general_form_address: lname: BLESS fname: ROBERT mi: C title: PROF category: PI inst: UNIV OF WISCONSIN addr_1: 475 N. CHARTER city: MADISON state: WI country: USA phone: 608-262-1715 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: GSC6323-01466 descr_1: STAR TO BE OCCULTED BY SATURN. descr_2: CLOSE APPROACH AT 5-SEP-91:22:12 pos_1: RA = 20H 13M 18.21S +/- 0.5", pos_2: DEC = -20D 27' 03.9" +/- 0.5", pos_3: PLATE-ID = 01D0 equinox: J2000 acqpr_1: BKG comment_1: COORDS FROM comment_2: GUIDE STAR CATALOG comment_3: SOLAR ELONG E140D fluxnum_1: 1 fluxval_1: V = 13.0 +/- 0.1 ! targnum: 2 name_1: 01466-OFFSET name_2: STAR-201321-202717 descr_1: OFFSET STAR TO BE ACQUIRED pos_1: RA = 20H 13M 20.54S +/- 1", pos_2: DEC = -20D 27' 16.6" +/- 1" equinox: J2000 acqpr_1: BKG comment_1: COORDS FROM PALOMAR SKY SURVEY, comment_2: WILL PROVIDE POSITION ACCURATE TO comment_3: WITHIN 0.25" FROM CURRENT comment_4: ASTROMETRY fluxnum_1: 1 fluxval_1: V = 15.3 +/- 0.1 ! targnum: 3 name_1: DARK-PMT pos_1: RA= 16H 27M 11.0S +/- 0.1S, pos_2: DEC= -24D 19' 14.0" +/- 0.1S, equinox: J2000 comment_1: DARK PORTION OF THE SKY FOR comment_2: PMT DARK MEASUREMENT. ! ! end of fixed targets solar_system_targets: targnum: 4 name_1: SATURN-BACKGROUND descr_1: OFFSET SATURN lev1_1: STD=SATURN lev2_1: TYPE= POS_ANGLE, lev2_2: RAD = 5, lev2_3: ANG = 130.45, lev2_4: REF = NORTH ! ! 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: 120S fluxnum_1: 1 priority: 1 req_1: GUID TOL 0.007"; comment_1: USE FINE LOCK FOR GUIDE STAR ACQ IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 5.000 sequence_1: DEFINE sequence_2: EXT-DARK targname: # config: HSP/PMT/VIS opmode: SPLIT aperture: 1.0 sp_element: F750W/F320N num_exp: 1 time_per_exp: 5M fluxnum_1: 1 priority: 1 param_1: SAMPLE-TIME=0.01, param_2: DATA-FORMAT=ALL, param_3: PRECISION=HIGH, param_4: ANALOG-SCALE=1000, comment_1: EXTERNAL STANDARD CALIBRATION. comment_2: USE GYROS FOR TRACKING. comment_3: HIGH ACCURACY NOT NEEDED, WANT comment_4: TO SAVE TIME. ! 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 SINGLE-EXP; req_2: GUID TOL 0.007"; comment_1: USE FINE LOCK FOR GUIDE STAR ACQ IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! 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: # req_1: CRIT OBS; req_2: GUID TOL 0.007"; comment_1: USE FINE LOCK FOR GUIDE STAR ACQ IF comment_2: BRIGHT ENOUGH GUIDE STARS CAN BE comment_3: FOUND. IF NOT, COARSE TRACK IS comment_4: ACCEPTABLE. ! linenum: 40.000 sequence_1: USE sequence_2: EXT-DARK targname: DARK-PMT req_2: GROUP 40-50 WITHIN 3D; req_6: CYCLE 0/40-90; ! linenum: 50.000 sequence_1: USE sequence_2: BACK-SCAN targname: SATURN-BACKGROUND time_per_exp: X107 param_1: SAMPLE-TIME=0.01, param_2: DATA-FORMAT=ALL, param_3: PRECISION=HIGH, param_4: ANALOG-SCALE=1000, req_1: SEQ 50-70 NO GAP; req_2: GROUP 50-90 WITHIN 7D; comment_1: DO LINES 50-70 SCANS AS CLOSE AS comment_2: POSSIBLE TO 80-90 OCCULTATION. THIS comment_3: IS IMPORTANT TO THE DATA ANALYSIS BUT comment_4: THE REQUIREMENTS WERE RELAXED TO comment_5: ENSURE THE OBSERVATION COULD BE comment_6: SCHEDULED. (P. STANLEY) ! linenum: 60.000 sequence_1: USE sequence_2: BACK-SCAN targname: SATURN-BACKGROUND time_per_exp: X319 param_1: SAMPLE-TIME=0.01, param_2: DATA-FORMAT=ALL, param_3: PRECISION=HIGH, param_4: ANALOG-SCALE=1000, ! linenum: 70.000 sequence_1: USE sequence_2: BACK-SCAN targname: GSC6323-01466 time_per_exp: X107 param_1: SAMPLE-TIME=0.01, param_2: DATA-FORMAT=ALL, param_3: PRECISION=HIGH, param_4: ANALOG-SCALE=1000, ! linenum: 80.000 sequence_1: USE sequence_2: ONBRD-ACQ targname: 01466-OFFSET req_1: ONBOARD ACQ FOR 90; req_3: SEQ 80-90 NO GAP; ! linenum: 90.000 sequence_1: USE sequence_2: RING-OCC targname: GSC6323-01466 time_per_exp: X32 param_1: SAMPLE-TIME=0.10, param_2: PRECISION=HIGH, param_3: DATA-FORMAT=ALL, param_4: ANALOG-SCALE=1000, req_1: AT 6-SEP-91:00:47 +/- 5M; comment_1: END EXPOSURE AT 6-SEP-91:01:12 comment_2: START AT 6-SEP-91:00:42 comment_3: ASSUME SPSS WILL PUT THIS AT START comment_4: OF WINDOW IF POSSIBLE. EXP TIME IS comment_5: SHORTER THAN THAT CALC FROM START- comment_6: STOP TIMES TO ACCT FOR EARTH OCCLS ! ! end of exposure logsheet scan_data: line_list: 50, 70 fgs_scan: cont_dwell: C dwell_pnts: 0 dwell_secs: 0.00 scan_width: 0.0000 scan_length: 21.2700 sides_angle: 90.0000 number_lines: 1 scan_rate: 0.2000 first_line_pa: 76.4502 scan_frame: CEL len_offset: 0. wid_offset: 0. ! line_list: 60 fgs_scan: cont_dwell: C dwell_pnts: 0 dwell_secs: 0.00 scan_width: 1.0000 scan_length: 21.2700 sides_angle: 90.0000 number_lines: 3 scan_rate: 0.2000 first_line_pa: 76.4502 scan_frame: CEL len_offset: 0. wid_offset: 0.5 ! ! end of scan data