! File: 2831C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:16:41:35 coverpage: title_1: DETERMINE MOVING TARGET PLATE SCALE proposal_for: CAL/FGS pi_title: DR. pi_fname: LAURENCE pi_mi: G. pi_lname: TAFF pi_inst: STSCI pi_country: USA pi_phone: 301-338-4799 hours_pri: 3.50 num_pri: 11 fgs: Y time_crit: X pi_position: INSTRUMENT SCIENTIST ! end of coverpage abstract: line_1: The goal of this procedure is to measure the plate scale of line_2: the FGSs to 0.002 arcsec over the length of the FGSFOV by line_3: measuring a minor planet as it traverses the FGSFOV. line_4: The derived numbers will go into the Calibration ST ScI line_5: database for SDAS reductions of individual FGS astrometric line_6: observations. A composite number, as yet TDB, will go into line_7: the Project database to replace the preliminary value of line_8: the OTA Plate Scale derived from AST-OV-11 (1546) The minimum line_9: SV plan calls for FGS2 (bay number) to be calibrated line_10: absolutely using the moving target, and the others to be line_11: calibrated differentially, using relative FGS measures line_12: in the OFAD (AST-SV-02 - 1567,1568,1569) field. SIGNED OVER line_13: TO CYCLE 1 CALIBRATION 18-SEPT-89, EDITED BY L. NAGEL ! ! end of abstract general_form_proposers: lname: TAFF fname: LAURENCE title: DR. mi: G. inst: STSCI country: USA ! lname: NAGEL fname: LAURETTA mi: M. inst: STSCI country: USA ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: The conversion from instrumental units to arcseconds on the line_2: sky is commonly referred to as "plate scale." The FGSs are line_3: supposed to have the capability to measure relative positions line_4: within the FGSFOV to an accuracy of +/-0.002 arcseconds. line_5: This is an order of magnitude better than ground-based line_6: observations, and so the plate scale must be determined line_7: in a manner other than measuring a "known" field. The short line_8: arc ephemeris motion of a well-studied solar system object line_9: such as an asteroid can be known to an order of magnitude line_10: higher accuracy. Therefore, the plan to calibrate the FGS line_11: scales is to measure a minor planet as it moves across the line_12: FGSFOVs, and determine the plate scales of each FGS in turn. line_13: The minimum calls for the transfer of the plate scale from line_14: FGS2 to FGS1 and 3. This is implemented in the OFAD. ! question: 3 section: 1 line_1: Minimum plan: steps 1-8,11-15; Delta plan: steps 9-10. line_2: Set all FGS filters to yellow for Astrometry measurements. line_3: 1) Point HST so that the moving target is near one extreme line_4: of the FGS FOV for FGS 2 and the spacecraft is oriented line_5: so that the direction of motion of the moving target is line_6: is along the long dimension of the FOV. line_7: 2) Acquire Guide Stars in FGS 1 and 3. line_8: 3) Acquire the moving target in POS mode. line_9: 4) Take data for 5 minutes. line_10: 5) Measure up to 10 stars for reference. line_11: 6) Reacquire the moving target in POS mode. line_12: 7) Take data for 5 minutes. line_13: 8) Repeat steps 2-7 five times evenly spaced over the period line_14: it takes the moving target to traverse the length of the FOV line_15: 9) Repeat steps 1-8 and 10 using FGS 3 as the astrometer. line_16: 10) Repeat steps 1-8 and 10 using FGS 1 as the astrometer. line_17: 11) 90 +/- 5 days BEFORE OFAD, point HST so FGS2 is centered line_18: 12) on the OFAD field. Measure all OFAD stars in FGS2. line_19: 13) On the OFAD date, Point HST so FGS1 is centered on line_20: 14) the OFAD field. Measure all the OFAD stars in FGS1. line_21: 15) This provides an exact maps of: line_22: FGS3 (first epoch) onto FGS2 (second epoch) and line_23: FGS2 (first epoch) onto FGS1 (second epoch). ! question: 3 section: 2 line_1: All repeats of a moving target as it traverses a given FGS FOV line_2: should be made with the same POS and ORIENT. line_3: Other observations may be made between these settings. ! question: 5 section: 1 line_1: Moving target in a particular orientation with requirements line_2: on the position of measurement within the FGSFOVs for all line_3: FGSs requires time criticality. line_4: The 'AT' Special Requirement is needed for moving line_5: target/reference field observations. This test should be line_6: performed at least one day after 1414-"Verify Moving Target line_7: Astrometry". Depending on launch date it may be necessary line_8: to provide additional targets that would be valid for other line_9: observing dates. line_10: The scale transfer from FGS2 to FGS1 and 3 will use OFAD line_11: observations in FGS2 and 3 from the Super-mini-OFAD line_12: for FGS3 (which preceed the full OFAD by 90 +/-5 days), line_13: and observations in FGS1 and 2 from the full 19 pointing line_14: OFAD for FGS2. These observations are specified in the line_15: OFAD proposals 1567 (line 506), and 1568 (line 521). line_18: Contact Paul Hemenway (512) 471 3431 for more information. ! question: 5 section: 2 line_1: To reduce the effects of thermal jitter, care in selecting guide line_2: stars is essential. (1) The dominant guide star of each pair should line_3: be in FGS#3, and the roll star in FGS#1. (2) If possible, the dominant line_4: guide star should be chosen as close to FGS#2 as feasable (it is line_5: best if in the half of FGS#3 that is closest to FGS#2.) (3) The secondary line_6: guide star should be chosen so that the line between the two guide line_7: stars is as nearly parallel to the ST V2 axis as possible. line_8: To reduce the effects of thermal jitter, care in selecting guide line_9: stars is essential. (1) The dominant guide star of each pair should line_10: be in FGS#3, and the roll star in FGS#1. (2) If possible, the dominant line_11: guide star should be chosen as close to FGS#2 as feasable (it is line_12: best if in the half of FGS#3 that is closest to FGS#2.) (3) The secondary line_13: guide star should be chosen so that the line between the two guide line_14: stars is as nearly parallel to the ST V2 axis as possible. ! question: 6 section: 1 line_1: The rate of motion of the minor planet must be determined from line_2: ground calibrations. The correction from center of light to line_3: center of mass must be accounted for, either by making the line_4: measurements at the same point in the light curve (determined line_5: by concurrent ground-based photometry) or by undertaking a line_6: program to determine the aspect of the minor planet as a line_7: function of time during the observations, or both. ! question: 7 section: 1 line_1: ADRS in SDAS will be used to derive the positions of the minor line_2: planet as a function of time. These will be compared with line_3: the expected ephemeris motion derived at the University of line_4: Texas, corrected for the usual known observational line_5: effects. The undistorted plate scale will then be derived for line_6: each FGS with an accuracy of 0.002 arcseconds over a major line_7: portion of the FGSFOVs. These numbers, their attendant errors, line_8: and the covariance matrix of the solution will be entered in line_9: the Project Data Base and the STScI data base to be used line_10: with SDAS analysis. ! question: 8 section: 1 line_1: All FGS numbers refer to BAY numbers. Ground-based plates line_2: will be required for an ephemeris update continuing after line_3: the observations. ! question: 10 section: 1 line_1: ADRS will be available in Austin. Ephemeris programs are also line_2: be available in Austin. Some personnel representing the AST line_3: will be available at STScI during the measurements to aid in line_4: the reduction and analysis. ! question: 13 section: 1 line_1: The operation of this test relies on knowledge gained from line_2: AST-OV-3, AST-OV-11, 1414-AST-SV-3, 1413-AST-SV-3A, in case line_3: 4kbps readout is necessary. The scale determination will line_4: affect virtually every subsequent FGS astrometric measurement. ! !end of general form text general_form_address: lname: TAFF fname: LAURENCE mi: G category: PI inst: ST SCI addr_1: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA ! lname: TAFF fname: LAURENCE mi: G. title: DR. category: PI inst: STSCI addr_1: 3700 SAN MARTIN DR. city: BALTIMORE state: MD zip: 21218 country: USA phone: 301-338-4799 ! lname: NAGEL fname: LAURETTA mi: M. category: CON inst: STSCI addr_1: 3700 SAN MARTIN DR. city: BALTIMORE state: MD zip: 21218 country: USA phone: 301-338-4432 ! ! end of general_form_address records fixed_targets: targnum: 200 name_1: MPPOINT descr_1: POINTING FOR HUNGARIA434 pos_1: RA = 313.626729D +/- .0008D, pos_2: DEC = 20.206665D +/- .0008D equinox: 2000 ! targnum: 201 name_1: SCALE434-1-REF descr_1: TARGET STAR FOR PLATE SCALE pos_1: RA = 313.402013D +/- .0008D, pos_2: DEC = 20.174686D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 14.17 +/- 1 ! targnum: 202 name_1: SCALE434-2-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.42745D +/- .0008D, pos_2: DEC = 20.1604D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 13.76 +/- 1 ! targnum: 203 name_1: SCALE434-3-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.448567D +/- .0008D, pos_2: DEC = 20.157214D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 13.81 +/- 1 ! targnum: 204 name_1: SCALE434-4-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.424879D +/- .0008D, pos_2: DEC = 20.147117D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 13.75 +/- 1 ! targnum: 205 name_1: SCALE434-5-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.432954D +/- .0008D, pos_2: DEC = 20.072947D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 14.21 +/- 1 ! targnum: 206 name_1: SCALE434-6-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.530067D +/- .0008D, pos_2: DEC = 20.050394D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 11.94 +/- 1 ! targnum: 207 name_1: SCALE434-7-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.4903D +/- .0008D, pos_2: DEC = 20.046525D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 13.79 +/- 1 ! targnum: 208 name_1: SCALE434-8-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.53645D +/- .0008D, pos_2: DEC = 20.002231D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 11 +/- 1 ! targnum: 209 name_1: SCALE434-9-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.582758D +/- .0008D, pos_2: DEC = 20.000989D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 14.19 +/- 1 ! targnum: 210 name_1: SCALE434-10-REF descr_1: REFERENCE STAR FOR PLATE SCALE pos_1: RA = 313.608562D +/- .0008D, pos_2: DEC = 19.980008D +/- .0008D equinox: 2000 fluxnum_1: 1 fluxval_1: V = 12.05 +/- 1 ! ! end of fixed targets solar_system_targets: targnum: 300 name_1: HUNGARIA434 descr_1: ASTEROID 434 HUNGARIA lev1_1: TYPE=ASTEROID, A=1.944082698, lev1_2: E=0.07400705314, I=22.50262226, lev1_3: O=175.489388056, W=123.79377551, lev1_4: M=258.24796578, EQUINOX=J2000, lev1_5: EPOCH=01-OCT-89:00:00:00 wind_1: WND1=28-JUN-90:00 TO 28-JUN-90:09, wind_2: WND2=28-JUN-90:09:30 TO 28-JUN-90:21, wind_3: WND3=28-JUN-90:21:30 TO 29-JUN-90:09, wind_4: WND4=30-JUN-90:03:30 TO 30-JUN-90:15, wind_5: WND5=30-JUN-90:15:30 TO 01-JUL-90:03, wind_6: WND6=01-JUL-90:03:30 TO 01-JUL-90:12 comment_1: TARGET DIAMETER ABOUT 16 MAS. comment_2: PREDICTIONS GOOD TO ABOUT 4 comment_3: ARCSEC. fluxnum_1: 1 fluxval_1: B=13.7 +/- 1.0 ! ! end of solar system targets ! No generic target records found exposure_logsheet: linenum: 101.000 sequence_1: DEFINE sequence_2: MPSCALE targname: MPPOINT config: S/C opmode: POINTING aperture: V1 num_exp: 1 time_per_exp: 0S priority: 1 req_1: SAME POS FOR 102-114 AS 101; req_2: SEQ 101-114 NO GAP; req_3: CYCLE 1 / 101-114; ! linenum: 102.000 sequence_1: ^ targname: HUNGARIA434 config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: 300S s_to_n: 10 fluxnum_1: 1 priority: ^ param_1: DATA-RATE=32, param_2: ACQ-MODE=SEARCH req_1: NON-INT; ! linenum: 103.000 sequence_1: ^ targname: SCALE434-1-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: 10S s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 104.000 sequence_1: ^ targname: SCALE434-2-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 105.000 sequence_1: ^ targname: SCALE434-3-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 106.000 sequence_1: ^ targname: SCALE434-4-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 107.000 sequence_1: ^ targname: SCALE434-5-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 108.000 sequence_1: ^ targname: SCALE434-6-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 109.000 sequence_1: ^ targname: SCALE434-7-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 110.000 sequence_1: DEFINE sequence_2: MPSCALE targname: SCALE434-8-REF config: FGS opmode: POS aperture: 2 sp_element: F550W num_exp: 1 time_per_exp: 10S s_to_n: 10 fluxnum_1: 1 priority: 1 param_1: DATA-RATE=32, param_2: ACQ-MODE=SEARCH req_1: NON-INT; ! linenum: 111.000 sequence_1: ^ targname: SCALE434-9-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 112.000 sequence_1: ^ targname: SCALE434-10-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 113.000 sequence_1: ^ targname: SCALE434-1-REF config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: ^ s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 114.000 sequence_1: ^ targname: HUNGARIA434 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: ^ time_per_exp: 300S s_to_n: ^ fluxnum_1: ^ priority: ^ param_1: ^ param_2: ^ req_1: NON-INT; ! linenum: 122.000 sequence_1: USE sequence_2: MPSCALE req_1: CRIT OBS / 122-128; req_2: AT 28-JUN-91:04:30:00.0 +/- 4.5H; ! linenum: 124.000 sequence_1: USE sequence_2: MPSCALE req_1: AT 28-JUN-91:15:15:00.0 +/- 5.75H; ! linenum: 126.000 sequence_1: USE sequence_2: MPSCALE req_1: AT 29-JUN-91:03:15:00.0 +/- 5.75H; ! linenum: 128.000 sequence_1: USE sequence_2: MPSCALE req_1: AT 30-JUN-91:09:00:00.0 +/- 6.0H; ! ! end of exposure logsheet ! No scan data records found