! File: 4264C.PROP ! Database: PEPDB ! Date: 20-FEB-1994:19:33:27 coverpage: title_1: FGS ASTEROID DIAMETERS sci_cat: SOLAR SYSTEM sci_subcat: MINOR PLANETS proposal_for: GO longterm: 1 pi_title: DR. pi_fname: LAURENCE pi_mi: G. pi_lname: TAFF pi_inst: STSCI pi_country: USA pi_phone: (410)338-4799 keywords_1: ASTEROID DIAMETERS hours_pri: 9.55 num_pri: 3 fgs: Y time_crit: Y pi_position: INSTRUMENT SCIENTIST off_fname: LAURENCE off_mi: G. off_lname: TAFF off_title: DR. off_inst: STSCI off_addr_1: 3700 SAN MARTIN DR. off_city: BALTIMORE off_state: MD off_zip: 21218 off_country: USA off_phone: (410)338-4799 ! end of coverpage abstract: line_1: The primary goal of this proposal is to demonstrate and utilize line_2: the capability of the FGSs to perform absolute angular diameter line_3: measurements of minor planets larger than 15 mas. Extant diameter line_4: estimates lack homogeneity and are often derived from physical models line_5: whose calibrations are based on severely limited empirical data. This line_6: program is designed to asses the ability of the FGSs to help overcome line_7: these limitations. As approved and directed by the Cycle 3 TAC, three line_8: asteroids of different, known, angular sizes between 20 mas and 100 mas line_9: will be observed in the center of the astrometer FGS. The minor planets line_10: have been selected so that observations will take place around line_11: opposition in order to minimize the problems involved with acquiring line_12: and observing moving targets. ! ! end of abstract general_form_proposers: lname: TAFF fname: LAURENCE title: DR. mi: G. inst: STSCI country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: Perform 60 sec POS mode observation then line_2: 15 Transfer Scans with the PUPIL filter line_3: for each of 3 target asteroids in opposition. ! question: 4 section: 1 line_1: The HST FGSs can produce an uniquely homogeneous large sample of line_2: accurate, model independent diameter measures for asteriods line_3: specifically chosen to cover a wide range of light curve line_4: amplitudes,light curve periods, taxonomic classes, and sizes. line_5: Only the HST FGSs have the capabilities to perform these line_6: observations over the aformentioned ranges and, therefore, help line_7: illuminate systematic effects in other observing techniques and line_8: allow the significant extension of asteroidal diameter knowledge. line_9: We request the minimum number of Transfer Scans (15) to guarantee line_10: data quality with respect to spacecraft jitter, terminator line_11: crossings, and other real-world problems with HST observing. ! question: 5 section: 1 line_1: We require the observations to coincide, as closely as possible line_2: given the current operational constraints of the telescope, with line_3: each target's opposition date in order to minimize the problems line_4: involved with acquiring and observing moving targets. ! question: 6 section: 1 line_1: No special calibration or dark time usage are necessary for this line_2: proposal. We require that all 15 Transfer Scans are obtained line_3: without interruption for each of the 3 targets. ! question: 7 section: 1 line_1: The reduction of the FGS data will be performed by the normal FGS line_2: data reduction pipeline (which exists outside of STSDAS). The line_3: calibration of FGS data with respect to angular diameter measure- line_4: ments will occur during the Instrument Scientist Cycle 1 cali- line_5: bration time. Software to determine the optimum angular diameter line_6: of a scientific target will be developed in association with this line_7: proposal. ! question: 8 section: 1 line_1: No additional comments are necessary. ! question: 9 section: 1 line_1: Previous HST data include the following proposals: line_2: 3842 Masses of Pre-Main Sequence Binary Stars, M. Simon, line_3: L. G. Taff line_4: 4593 Determining the Distance to a Pulsar: Geminga, N. Bignami, line_5: P. Caraveo, L. G. Taff line_6: 4283 Mass Ratio Determination for Doubles with Substellar Mass line_7: Members, L. G. Taff, J. Hershey. ! question: 10 section: 1 line_1: The STScI will provide the basic FGS data reduction pipeline, line_2: office space, basic computing facilities, secretarial support, line_3: graphics support, and so on. ! !end of general form text general_form_address: lname: TAFF fname: LAURENCE mi: G. title: DR category: PI inst: STSCI addr_1: 3700 SAN MARTIN DR. city: BATLIMORE state: MD zip: 21218 country: USA phone: (410)338-4799 ! ! end of general_form_address records ! No fixed target records found solar_system_targets: targnum: 77 name_1: FRIGGA descr_1: ASTEROID FRIGGA lev1_1: STD = 77(FRIGGA) wind_1: WND1=10-DEC-93:05:00 TO 12-DEC-93:05:00 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS SMALL TARGET # 1 OF 3; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF THREE SMALL TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 11.2 +/- 0.2 ! targnum: 78 name_1: DIANA descr_1: ASTEROID DIANA lev1_1: STD = 78(DIANA) wind_1: WND1=16-JAN-94:19:12 TO 18-JAN-94:19:12 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS LARGE TARGET # 1 OF 2; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF TWO LARGE TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 11.3 +/- 0.2 ! targnum: 230 name_1: ATHAMANTIS descr_1: ASTEROID 230 ATHAMANTIS lev1_1: STD = 230(ATHAMANTIS) wind_1: WND1=03-NOV-93:16:48 TO 05-NOV-93:16:48 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS MED TARGET # 1 OF 2; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF TWO MED TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 10.2 +/- 0.2 ! targnum: 261 name_1: PRYMNO descr_1: ASTEROID PRYMNO lev1_1: STD = 261(PRYMNO) wind_1: WND1=31-DEC-93:16:48 TO 02-JAN-94:16:48 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS SMALL TARGET # 2 OF 3; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF THREE SMALL TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 12.3 +/- 0.2 ! targnum: 371 name_1: BOHEMIA descr_1: ASTEROID BOHEMIA lev1_1: STD = 371(BOHEMIA) wind_1: WND1=19-DEC-93:19:12 TO 21-DEC-93:19:12 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS SMALL TARGET # 3 OF 3; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF THREE SMALL TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 12.7 +/- 0.2 ! targnum: 375 name_1: URSULA descr_1: ASTEROID URSULA lev1_1: STD = 375(URSULA) wind_1: WND1=26-DEC-93:09:36 TO 28-DEC-93:09:36 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS LARGE TARGET # 2 OF 2; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF TWO LARGE TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 12.0 +/- 0.2 ! targnum: 690 name_1: WRATISLAVIA descr_1: ASTEROID WRATISLAVIA lev1_1: STD = 690(WRATISLAVIA) wind_1: WND1=20-DEC-93:14:24 TO 22-DEC-93:14:24 comment_1: WE DO NOT WANT THIS TREATED comment_2: AS A MOVING TARGET; WE ARE comment_3: OBSERVING THIS AT OPPOSITION comment_4: SO THAT NO SPECIAL COMMANDING comment_5: NEEDS TO BE INVOKED. comment_6: THIS IS MED TARGET # 2 OF 2; comment_7: TO MAXIMIZE SCHEDULING FLEXIBILITY comment_8: ONE OF TWO MED TARGETS WILL comment_9: BE SELECTED. fluxnum_1: 1 fluxval_1: V = 11.3 +/- 0.2 ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 1.000 sequence_1: DEFINE AST targname: # config: FGS opmode: POS aperture: 3 sp_element: # num_exp: 1 time_per_exp: 20S fluxnum_1: 1 priority: 1 param_1: DATA-RATE = 32, req_1: CYCLE 3; req_2: SEQ 1-2 NON-INT; ! linenum: 2.000 sequence_1: DEFINE AST targname: # config: FGS opmode: TRANS aperture: 3 sp_element: # num_exp: 1 time_per_exp: 170S fluxnum_1: 1 priority: 1 param_1: DATA-RATE = 32, param_2: STEP-SIZE = 0.3, param_3: SCANS = 1 req_1: CYCLE 3; req_2: REPEAT 1,2 req_3: EVERY 1S req_4: +/- 1M req_5: FOR 14 MORE TIMES; ! linenum: 101.000 sequence_1: USE AST targname: FRIGGA sp_element: PUPIL comment_1: SELECT ONE OF 101-103 comment_2: AS SCHEDULING PERMITS ! linenum: 102.000 sequence_1: USE AST targname: PRYMNO sp_element: PUPIL comment_1: SELECT ONE OF 101-103 comment_2: AS SCHEDULING PERMITS ! linenum: 103.000 sequence_1: USE AST targname: BOHEMIA sp_element: PUPIL comment_1: SELECT ONE OF 101-103 comment_2: AS SCHEDULING PERMITS ! linenum: 201.000 sequence_1: USE AST targname: ATHAMANTIS sp_element: PUPIL comment_1: SELECT ONE OF 201-202 comment_2: AS SCHEDULING PERMITS ! linenum: 202.000 sequence_1: USE AST targname: WRATISLAVIA sp_element: PUPIL comment_1: SELECT ONE OF 201-202 comment_2: AS SCHEDULING PERMITS ! linenum: 301.000 sequence_1: USE AST targname: DIANA sp_element: PUPIL comment_1: SELECT ONE OF 301-302 comment_2: AS SCHEDULING PERMITS ! linenum: 302.000 sequence_1: USE AST targname: URSULA sp_element: PUPIL comment_1: SELECT ONE OF 301-302 comment_2: AS SCHEDULING PERMITS ! ! end of exposure logsheet ! No scan data records found