! File: 2830C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:16:38:41 coverpage: title_1: NEAR AND MID ANGLE SCATTERING MEASUREMENT TEST proposal_for: CAL/OTA pi_fname: HASHIMA pi_lname: HASAN pi_inst: ST SCI pi_country: USA pi_phone: (301) 338-4519 num_pri: 2 wf_pc: Y fos: Y ! end of coverpage abstract: line_1: Test Objectives - THIS IS A CONTINGENCY PROPOSAL. It will be used to determine line_2: the effect of internal HST light scattering if unsatisfactory results are line_3: obtained from SV. Use spectroscopic measurements taken within a radius of line_4: approximately 40 arc seconds from a bright (V about 7) target star. line_6: The scattering may be due line_7: to dust particles or minute surface irregularities in the OTA mirror surfaces. line_8: Determine the spectral energy distribution by obtaining low resolution line_9: spectra over a wide range of wavelengths. Also determine the radial line_10: dependence of the scattered light measurements. Derive the possible line_11: impact on HST observations. ! ! end of abstract general_form_proposers: lname: ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: Test Description - THIS IS A CONTINGENCY TEST. line_2: Determine the effect of internal HST light scattering. Use spectroscopic line_3: measurements taken within a radius of approximately 40 arc seconds line_4: from a bright (V about 7) target star. line_6: The scattering may be due to dust line_7: particles or minute surface irregularities in the OTA mirror surfaces. line_8: Determine the spectral energy distribution by obtaining low resolution line_9: spectra over a wide range of wavelengths. Also determine the radial line_10: dependence of the scattered light measurements. Derive the possible line_11: impact on HST observations. ! question: 3 section: 1 line_1: line_2: The scattering measurement test is made up of two overlapping parts. line_3: First the detectors of the FOS are used to sample the sky immediately line_4: surrounding a bright star. Scattering will be caused by dust particles line_5: within the OTA or microscopic irregularities of the OTA mirror surfaces. line_6: A series of HST attitudes will be chosen to point the FOS at selected line_7: offset positions from the star which lie along a line at 45 degrees to line_8: the spider diffraction peaks. Spectroscopic data is taken in both the line_9: red and blue FOS channels. The FOS spertures increase in size with line_10: distance from the star. Measurements with a new aperture will overlap line_11: a portion of those obtained from the previously used aperture to enable line_12: the diffraction at the aperture to be accounted for as a function of line_13: wavelength. ! question: 3 section: 2 line_1: line_2: When the star is a safe distance from the apertures and the signal to line_3: noise ratio of the stray light component is appreciably attenuated, a line_4: second much brighter star is used as the source of stray light. line_5: Measurements are overlapped to give a spectro-photometric line_6: calibration of the new and brighter star. The WF/PC in its WFC mode is line_7: used to obtain exposures at the largest distances from the line_8: aperture. In these cases, the WFC is used as a wide field photometer. line_9: The FOS will enable a precise determination of the spectral energy line_10: distribution of the scattered light and any radial dependence line_11: close to the target. FOS spectral intensity measurements will line_12: provide an estimate of the wavelength dependence of the scattered light line_13: and some indication of the type and size of the scattering source. line_14: The WFC photometric data will enable a determination of the radial line_15: dependence of the intensity of scattered light at the furthest positions line_16: measured from the target. ! question: 3 section: 3 line_1: Test Procedure: line_2: Spectra are taken for different offsets and apertures using line_3: FOS BLUE with G160L grating and FOS RED with G650L grating. line_4: Depending on the offset position two different target stars line_5: of varying brightness are used for each FOS mode. ! question: 4 section: 1 line_1: Submitted as an Observatory Level Test ! question: 5 section: 1 line_1: Test Requirements: line_2: - Exp lines which call for large offsets (27,29,31,66), line_3: use gyro track line_4: - Optical image quality should be near Level 1 (lambda / 8). line_5: - No observations made during SAA passage. line_8: - Relative positions of bright star (?) and guide stars known line_9: to 0.3 arcsec (1 sigma) accuracy. line_10: - The POS TARG offsets were calculated using a line_11: position angle in the radial direction which approximately line_12: bissected the V2V3 axes. This direction is required line_13: to avoid the scattered light from the secondary spider. line_14: -NOTE: There will be an extremely bright target (V = 0.6) present in line_15: the focal plane during a portion of this OLT. It will be offset line_16: from 6 arsec to a degree from the FOS 2.0 arc second aperture ! question: 7 section: 1 line_1: Real Time Data Analysis Requirements: line_2: Not anticipated at this time. line_3: Off Line Data Analysis Requirements: line_4: FOS Observations: line_5: o Compare the spectrum taken with the FOS positioned at the sky line_6: background position to the spectra obtained at each of the offset line_7: positions for each detector and aperture combination. line_8: o Derive the following: line_9: o Intensity ratios at selected wavelengths. line_10: o Intensity ratios at various radial distances. line_11: o Estimate of wavelength dependence of intensity ratios. line_12: o Estimate of radial dependence of intensity ratios. line_13: WFC Observations: line_14: o Choose suitably spaced bins in radius across the FOV. For each line_15: bin, find the histogram and remove the tail caused by sources. line_16: Extract the background and radial dependence. ! question: 8 section: 1 line_1: ! question: 9 section: 1 line_1: Results of this OLT will be documented in an ST ScI Technical line_2: Report with distribution to appropriate personnel. Test line_3: results may also be submitted for publication in an line_4: appropriate technical journal. ! !end of general form text general_form_address: lname: HASAN fname: HASHIMA category: PI inst: ST SCI addr_1: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA ! lname: HASHIMA fname: HASAN mi: N title: DR. inst: STSCI addr_1: 3700 SAN MARTIN DRIVE city: BALTIMORE state: MD zip: 21218 country: USA phone: 301-338-4519 from_date: 01-JAN-87 to_date: 01-JAN-95 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: HD44927 descr_1: BRIGHT A2V STAR pos_1: RA=06H 25M 32.9S +/- 0.1S, pos_2: DEC=+23D 19' 37" +/- 1" equinox: 2000 fluxnum_1: 1 fluxval_1: V = 7.10 +/- 0.05, TYPE = A2V fluxnum_2: 2 fluxval_2: B = 7.07 +/- 0.05 ! targnum: 2 name_1: HD122451 name_2: BETA CEN descr_1: VERY BRIGHT B1III STAR pos_1: RA=14H 03M 49.4S +/- 0.1S, pos_2: DEC=-60D 22' 22" +/- 1" equinox: 2000 fluxnum_1: 1 fluxval_1: V = 0.61 +/- 0.01, TYPE = B1 fluxnum_2: 2 fluxval_2: B = 0.38 +/- 0.01 ! targnum: 3 name_1: TBD-STAR-OFFSET descr_1: OFFSET STAR NEAR HD122451 pos_1: RA = 14H 03M 00.00S +/- 1.0S, pos_2: DEC = -60D 22' 00" +/- 1" equinox: 2000 comment_1: THIS IS A STAR NEAR BETA CEN TO comment_2: ACQUIRE FIRST TO MAKE SURE BETA CEN comment_3: IS KEPT WELL AWAY FROM APERTURE. comment_4: BRIAN MCCLEAN WILL SUPPLY STAR comment_5: AROUND JUNE 1. (BCW) fluxnum_1: 1 fluxval_1: V=14 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: HD44927 config: FOS/BL opmode: ACQ/PEAK aperture: 1.0-PAIR-A sp_element: G160L num_exp: 1 time_per_exp: 1S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE=6, param_2: SCAN-STEP=0.5 req_1: ONBOARD ACQ FOR 2; req_2: GROUP 1-31 WITHIN 48H; ! linenum: 2.000 targname: HD44927 config: ^ opmode: ACQ/PEAK aperture: 0.25-PAIR-A sp_element: ^ num_exp: 1 time_per_exp: 1S s_to_n: 30 fluxnum_1: ^ priority: ^ param_1: SEARCH-SIZE=5, param_2: SCAN-STEP=0.2, req_1: ONBOARD ACQ FOR 3 ! linenum: 3.000 targname: HD44927 config: ^ opmode: ACQ/PEAK aperture: 0.1-PAIR-A sp_element: ^ num_exp: 1 time_per_exp: 1S s_to_n: 30 fluxnum_1: ^ priority: ^ param_1: SEARCH-SIZE=5, param_2: SCAN-STEP=0.04 req_1: ONBOARD ACQ FOR 4-15 ! linenum: 4.000 targname: HD44927 config: ^ opmode: ACCUM aperture: 0.1-PAIR-A sp_element: G160L num_exp: 1 time_per_exp: 5S s_to_n: 30 fluxnum_1: ^ priority: ^ req_1: SEQ 4-8 NO GAP ! linenum: 5.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 43S s_to_n: 10 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.08,-0.06 ! linenum: 6.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 31S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.16,-0.12 ! linenum: 7.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 110S s_to_n: 2 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.32,-0.24 ! linenum: 8.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 219S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.64,-0.48 ! linenum: 9.000 targname: HD44927 config: FOS/BL opmode: ACCUM aperture: 0.25-PAIR-A sp_element: G160L num_exp: 1 time_per_exp: 29S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: SEQ 9-12 NO GAP; req_2: POS TARG 0.32,-0.24 ! linenum: 10.000 targname: HD44927 config: FOS/BL opmode: ACCUM aperture: 0.25-PAIR-A sp_element: G160L num_exp: 1 time_per_exp: 101S s_to_n: 2 fluxnum_1: 1 priority: 1 req_1: POS TARG 0.64,-0.48 ! linenum: 11.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 203S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 1.28,-0.96 ! linenum: 12.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 1623S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 2.56,-1.92 ! linenum: 13.000 targname: HD44927 config: FOS/BL opmode: ACCUM aperture: 1.0-PAIR-A sp_element: G160L num_exp: 1 time_per_exp: 913S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: SEQ 13-15 NO GAP; req_2: POS TARG 2.56,-1.92 ! linenum: 14.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 311S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 5.12,-3.83 ! linenum: 14.500 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 800S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 10.24,-7.66 ! linenum: 15.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 913S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: POS TARG 48.0,-35.9; req_2: GUID TOL 0.01"; comment_1: SKY 60" FROM TARGET. ! linenum: 21.500 targname: TBD-STAR-OFFSET config: FOS/BL opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 0.5S fluxnum_1: 1 priority: 1 param_1: BRIGHT=66000, req_1: ONBOARD ACQ FOR 22-27; comment_1: BLIND OFFSET. ACQUIRE THIS STAR comment_2: TO CHECK LOCATION (I.E. NOT NEAR comment_3: BETA CEN), THEN BLIND OFFSET TO 22. ! linenum: 22.000 targname: HD122451 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 16S s_to_n: 10 fluxnum_1: ^ priority: ^ req_1: POS TARG 10.25,-6.52 comment_1: SCHEDULERS - MAKE SURE POS TARG comment_2: IS WORKING FOR ALL OBSERVATIONS comment_3: SINCE THE STAR IS 0TH MAGNITUDE comment_4: AND WOULD DAMAGE THE INSTRUMENT. ! linenum: 23.000 targname: HD122451 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 62S s_to_n: 10 fluxnum_1: ^ priority: ^ req_1: POS TARG 20.5,-14.19 ! linenum: 24.000 targname: HD122451 config: FOS/BL opmode: ACQ/BINARY aperture: 4.3 sp_element: MIRROR num_exp: 1 time_per_exp: 250S s_to_n: 10 fluxnum_1: 1 priority: 1 req_1: POS TARG 40.99,-29.53 ! linenum: 25.000 targname: HD122451 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 90S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: POS TARG 81.98,-60.2 ! linenum: 26.000 targname: HD122451 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 40S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 164.0,-121.6 ! linenum: 27.000 targname: HD122451 config: ^ opmode: ^ aperture: ^ sp_element: ^ num_exp: 1 time_per_exp: 160S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 327.9,-244.3; req_2: GUID TOL 0.01" comment_1: GYRO TRACKING ACCEPTABLE ! linenum: 29.000 targname: HD122451 config: FOS/BL opmode: ACCUM aperture: 2.0-BAR sp_element: G160L num_exp: 1 time_per_exp: 639S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 655.9,-489.7; req_2: GUID TOL 0.01" comment_1: GYRO TRACKING ACCEPTABLE ! linenum: 31.000 targname: HD122451 config: FOS/BL opmode: ACCUM aperture: 2.0-BAR sp_element: G160L num_exp: 1 time_per_exp: 639S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 2882,-2156; req_2: GUID TOL 0.01" comment_1: GYRO TRACKING ACCEPTABLE; comment_2: SKY: 60' FROM TARGET ! linenum: 32.000 targname: HD122451 config: WFC opmode: IMAGE aperture: ALL sp_element: F336W num_exp: 1 time_per_exp: 600S s_to_n: 1 fluxnum_1: ^ priority: ^ param_1: SUM=2X2 req_1: POS TARG 84.85, 84.85 ! linenum: 38.000 targname: HD44927 config: FOS/RD opmode: ACQ/PEAK aperture: 1.0-PAIR-A sp_element: G650L num_exp: 1 time_per_exp: 0.3S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: SEARCH-SIZE=6, param_2: SCAN-STEP=0.5 req_1: ONBOARD ACQ FOR req_2: 39; GROUP 38-51 req_3: WITHIN 48H ! linenum: 39.000 targname: ^ config: ^ opmode: ACQ/PEAK aperture: 0.25-PAIR-A sp_element: ^ num_exp: 1 time_per_exp: 0.3S s_to_n: 30 fluxnum_1: ^ priority: ^ param_1: SEARCH-SIZE=5, param_2: SCAN-STEP=0.2 req_1: ONBOARD ACQ FOR 40 ! linenum: 40.000 targname: ^ config: ^ opmode: ACQ/PEAK aperture: 0.1-PAIR-A sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 0.3S s_to_n: 30 fluxnum_1: ^ priority: ^ param_1: SEARCH-SIZE=5 param_2: SCAN-STEP=0.04 req_1: ONBOARD ACQ FOR req_2: 41-51; ! linenum: 41.000 targname: HD44927 config: FOS/RD opmode: ACCUM aperture: 0.1-PAIR-A sp_element: G650L num_exp: 1 time_per_exp: 86S s_to_n: 30 fluxnum_1: 1 priority: 1 req_1: SEQ 41-44 NO GAP ! linenum: 42.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 156S s_to_n: 10 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.08,0.06 ! linenum: 43.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 112S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.16,0.12 ! linenum: 44.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 399S s_to_n: 2 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.32,0.24 ! linenum: 45.000 targname: HD44927 config: FOS/RD opmode: ACCUM aperture: 0.25-PAIR-A sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 64S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: SEQ 45-47 NO GAP; req_2: POS TARG 0.32,0.24 ! linenum: 46.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 227S s_to_n: 2 fluxnum_1: ^ priority: ^ req_1: POS TARG 0.64,0.48 ! linenum: 47.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 454S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 1.28,0.96 ! linenum: 48.000 targname: HD44927 config: FOS/RD opmode: ACCUM aperture: 1.0-PAIR-A sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 255S s_to_n: 3 fluxnum_1: ^ priority: ^ req_1: SEQ 48-51 NO GAP; req_2: POS TARG 1.28,0.96 ! linenum: 49.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 227S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 2.56,1.92 ! linenum: 50.000 targname: HD44927 config: ^ opmode: ^ aperture: ^ sp_element: ^ wavelength: ^ num_exp: 1 time_per_exp: 1817S s_to_n: 1 fluxnum_1: ^ priority: ^ req_1: POS TARG 5.12,3.83 ! linenum: 51.000 targname: HD44927 config: FOS/RD opmode: ACCUM aperture: 1.0-PAIR-A sp_element: G650L num_exp: 1 time_per_exp: 1817S s_to_n: 1 fluxnum_1: 1 priority: 1 req_1: POS TARG 48.0,35.9 comment_1: SKY: 60" FROM TARGET ! ! end of exposure logsheet ! No scan data records found