! $Id: 226,v 3.1 1994/07/26 21:23:45 pepsa Exp $ coverpage: title_1: S/C MODE TEST PROPOSAL I sci_cat: OV proposal_for: OV/PAS pi_title: DR. pi_fname: D. pi_mi: B. pi_lname: MCELROY pi_inst: SPACE TELESCOPE SCIENCE INSTITUTE pi_country: USA pi_phone: 4739 keywords_1: N/A hours_pri: 5.60 num_pri: 4 wf_pc: X realtime: X funds_amount: 9999 funds_length: 12 funds_date: MAY-89 ! end of coverpage abstract: line_1: Starting from a specific attitude, ST will be commanded to perform a series of line_2: pitch, yaw and roll maneuvers in order to acquire RGA data and FHST attitudes line_3: to compute the initial FHST/RGA scale-factor-alignment matrices. The results line_4: of the analysis will be used to update the PDB and the flight software, and are line_5: necessary for future observations. ! ! end of abstract general_form_proposers: lname: RUMPL fname: W. inst: COMPUTER SCIENCES CORPORATION country: USA ! lname: FALLON fname: L. inst: COMPUTER SCIENCES CORPORATION country: USA ! lname: ABSHIRE fname: G. inst: COMPUTER SCIENCES CORPORATION country: USA ! lname: DAVENPORT fname: P. inst: GODDARD SPACE FLIGHT CENTER country: USA ! lname: VANLANDINGHAM fname: F. inst: COMPUTER SCIENCES CORPORATION country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 0 line_1: This activity is a required step in the determination of the alignment and line_2: calibration parameters necessary for the proper processing of attitude sensor line_3: data in the onboard Pointing Control System and in the ground PASS software. ! question: 3 section: 1 line_1: Each of the 90 line_2: degree slew maneuvers required in performing this calibration will cause the line_3: generation of an autonomous delayed FHST 3-axis attitude update. In the line_4: following description, positive roll, pitch, and yaw are defined as positive line_5: rotations (right-hand coordinate system) around the +v1, +v2, and +v3 axes, line_6: respectively. Data from at least two simultaneously unocculted FHSTs will be line_7: taken for at least five minutes immediately before and after each maneuver. RGA line_8: data is required from the start of the FHST data taken preceding a maneuver, line_9: during the maneuver, and through the data take following a maneuver. The RGA line_10: data takes during any of the 90D maneuvers specified do not have to be line_11: interrupted because of occultations or SAA passages. However, the FHST data line_12: takes that follow the maneuver should be initiated immediately upon completion line_13: of any of these maneuvers, and the maneuvers should commence immediately upon line_14: completion of the FHST data takes that precede the maneuver. Real-time line_15: downlinks are preferred for all data takes; however, data takes must be line_16: backed up to the ETR. ! question: 3 section: 2 line_1: The maneuvers descirbed in this proposal are in two groups. After the first line_2: group of maneuvers is performed, the PASS shall require seven hours to process line_3: the data. The FHST/RGA scale-factor-alignment matrices are then uplinked. A line_4: second group of maneuvers is then performed. The results of the processing of line_5: the data obtained from the second group of maneuvers will be available on the line_6: PASS data bases twelve hours after the receipt of the data associated with all line_7: the maneuvers in the second group. The maneuvers in each group are described line_8: in the following paragraphs. No preferred sequence of performing the maneuvers line_9: within either group is required. ! question: 3 section: 3 line_1: The maneuvers within the first group are described as follows. (1) The HST is line_2: maneuvered to point the -v1 axis to the sun and the +v3 axis at the North line_3: Ecliptic Pole. The HST is then pitched -90D. (2) The HST is maneuvered to point line_4: the +v1 axis to the North Ecliptic Pole and the +v3 axis at the sun. The HST is line_5: then yawed +90D. (3) The HST is maneuvered to point the +v1 axis to a point on line_6: the ecliptic plane which is 90D east of the anti-sun and with the +v3 axis at line_7: the sun. The HST is then pitched +90D. (4) The HST will be maneuvered to point line_8: the -V1 axis toward the sun, and the +v3 axis in the ecliptic plane east of the line_9: anti-sun. The HST is then rolled +180D. line_11: The maneuvers within the second group are described as follows. (1) The HST is line_12: maneuvered to point the -V1 axis to the sun and the +V3 axis in the ecliptic line_13: plan west of the anti-sun. The HST is then rolled -90D. (2) The HST is line_14: maneuvered to point the -V1 axis to the sun and the +V3 axis at the North line_15: Ecliptic Pole. The HST is then pitched -90D. (3) The HST is pointed to the NEP line_16: and the +V3 axis at the sun. The HST is then yawed -90D. (4) The HST is pointed line_17: to a point 90D west of the sun and the +V3 axis at the sun. The HST is then line_18: pitched +90D. ! question: 4 section: 0 line_1: N/A ! question: 5 section: 0 line_1: Real-time downlinks are preferred for all data takes; however, all data takes line_2: must be backed up to the ETR. The line_3: telemetry format must be the PN (32 kbps) format starting and ending with the line_4: FHST data takes associated with each maneuver, as well as during the maneuvers. line_5: At other times the telemtry format sould be AN (4 kbps) format. At least two line_6: FHSTs must be simultaneously unocculted immediately prior to, and after each line_7: maneuver. line_9: This proposal specifically requests an ETR dump following each maneuver group. line_10: The proposers anticipate that more frequent ETR dumps will be performed within line_11: each group according to the ETR dump policy developed for orbital verification. ! question: 7 section: 0 line_1: The data reduction will be performed in the PASS system. The initial FHST/RGA line_2: scale-factor-alignment matrices are expected to be available on the PASS data line_3: bases about 7 hours after the receipt of the data associated with all the line_4: maneuvers in the first group. The corresponding results for the second line_5: sequence should be available on the PASS data bases about 12 hours after the line_6: receipt of the data associated wiht all the maneuvers in the second group. ! question: 8 section: 0 line_1: Prior to this activity, the FHST/FHST alignment determination (Prop. #1437) line_2: must be completed. Following this activity the FGS Pattern Match activity line_3: (Prop # 1538), in which the FGS/FHST alignment will be determined, will take line_4: place. ! question: 9 section: 0 line_1: N/A ! question: 10 section: 0 line_1: N/A ! question: 12 section: 0 line_1: N/A ! question: 13 section: 0 line_1: N/A ! !end of general form text general_form_address: lname: DAVENPORT fname: PAUL category: PI inst: GODDARD SPACE FLIGHT CENTER addr_1: MAIL CODE 514, BLDG. 3/229 city: GREENBELT state: MD zip: 20771 country: USA phone: (301) 344-5563 ! lname: VANLANDINGHAM fname: FRANK category: CON inst: COMPUTER SCIENCES CORP. addr_1: 4600 POWDER MILL RD addr_2: PASS PROJECT city: BELTSVILLE state: MD zip: 20705 country: USA phone: (301) 937-0760 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: NEP descr_1: A,101 pos_1: RA=18H 2M 20.68S+/-.2M, pos_2: DEC=+66D 33' 15.17" +/-1.5' equinox: 2000 ! targnum: 2 name_1: A-S descr_1: A,101 pos_1: RA=18H 2M 20.68S+/-.2M, pos_2: DEC=-22D 33' 15.17" +/-1.5' equinox: 2000 ! targnum: 3 name_1: A-S90E descr_1: A,101 pos_1: RA=00H 2M 20.68S+/-.2M, pos_2: DEC=+00D 33' 15.17" +/-1.5' equinox: 2000 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 2.000 targname: A-S config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M num_exp: 1 time_per_exp: 300S priority: 1 req_1: SEQ 2,4; CYCLE 4 / 2-15 ! linenum: 3.000 targname: DARK config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 300S priority: 1 param_1: FORMAT=PN req_1: PAR WITH 2; comment_1: +V3 AXIS POINTED AT NEP. ! linenum: 4.000 targname: NEP config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 300S priority: 1 param_1: FORMAT=PN req_1: CRIT OBS; comment_1: POINTING IS A -90D PITCH FROM 1. ! linenum: 6.000 targname: NEP config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M num_exp: 1 time_per_exp: 300S priority: 1 req_1: SEQ 6-9; comment_1: +V3 AXIS POINTED AT SUN. ! linenum: 7.000 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 300S priority: 1 param_1: SCI-RATE=HIGH, param_2: FORMAT=AN req_1: REQ UPLINK; ! linenum: 8.000 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 300S priority: 1 param_1: FORMAT=PN req_1: AFTER 6 BY 10H; ! linenum: 9.000 targname: DARK config: S/C opmode: DATA aperture: NONE num_exp: 1 time_per_exp: 300S priority: 1 param_1: SCI-RATE=LOW req_1: REQ UPLINK; req_2: RT ANALYSIS FOR 11; ! linenum: 11.000 targname: A-S90E config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 300S priority: 1 param_1: CONTROL=FGS, param_2: FORMAT=AN, param_3: SCI-RATE=LOW req_1: REQ UPLINK; req_2: RT ANALYSIS FOR 15; comment_1: +V3 AXIS POINTED AT SUN. ! linenum: 15.000 targname: A-S config: S/C opmode: DATA aperture: V1 num_exp: 1 time_per_exp: 300S priority: 1 param_1: FORMAT=PN, param_2: SCI-RATE=LOW ! ! end of exposure logsheet ! No scan data records found