! File: 4701C.PROP ! Database: PEPDB ! Date: 22-FEB-1994:23:01:15 coverpage: title_1: HSP SHORT-TERM PHOTOMETRIC STABILITY TEST HSP-11 proposal_for: CAL/HSP pi_fname: ROBERT pi_mi: C. pi_lname: BLESS pi_inst: UNIVERSITY OF WISCONSIN pi_country: USA pi_phone: 608-262-1715 hours_pri: 12.34 num_pri: 2 ! end of coverpage abstract: line_1: This proposal defines the procedure for determining, in the most stringent line_2: manner possible, the short-term photometric stability of the HSP. Using the line_3: UV1 IDT in the digital mode of operation, it will determine whether any line_4: system in ST or the HSP (mechanical or electrical) introduces extraneous white line_5: (frequency independent) noise or small amplitude periodicities into the line_6: observations at a level of one part in 24,000. This procedure will also line_7: satisfy the relevant Contract End Item (CEI) specification regarding line_8: photometric accuracy. line_9: Revision status: Mark Slovak 11/03/88 line_10: Translated to V2 instructions, Sally Laurent 2/16/89 line_11: Updated: Sally Laurent 3/2/89, 5/13/89; Fixes for aberration problem - line_12: SALM 7/30/90; Changed detector to UV1, target from G star to A star-- line_13: BJW 4/2/91; Update description of proposal--BJW 4/5/91; Changed data line_14: format/sample-time--BJW 5/31/91; line_15: Changed sample time for FPO fix--MJN 8-10-92. ! ! end of abstract general_form_proposers: lname: BLESS fname: R. mi: C. inst: UNIVERSITY OF WISCONSIN country: USA ! lname: PERCIVAL fname: J. mi: W. inst: UNIVERSITY OF WISCONSIN country: USA ! lname: DOLAN fname: J. mi: F. inst: GODDARD SPACE FLIGHT CENTER country: USA ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: The proposed observations will use the UV1 IDT (IDT#2) on the line_2: HSP configured in the single color photometry mode with an inner 1.0 arcsec line_3: aperture to sample the stellar source through the F240W filter. line_4: The observations planned will consist of integrations totaling line_5: 20,000 seconds on a rapidly oscillating peculiar A star. ! question: 5 section: 1 line_1: No real-time observations are requested for this proposal. The observation line_2: should be scheduled for orbits that avoid the South Atlantic Anomaly (SAA). line_3: Pointing Stability: Coarse track is understood to have less than line_4: 19 marcsec stability. That is satisfactory for all observations line_5: in the 10" and 1.0" UV1, UV2, and VIS IDT apertures, the PMT,and the line_6: 6.0" (finding) POL aperture. HSP requires fine lock for all observations line_7: in the 0.65" POL IDT apertures and all 0.4" apertures. ! question: 6 section: 1 line_1: The observatons in this proposal require a total integration time of line_2: 20,000 seconds. The extended nature of the observation is essential for two line_3: reasons: line_5: a) to have an extended record of the photometric response of the HSP over line_6: time scale where any significant thermal or electronic changes will line_7: become evident; line_9: b) to collect of order 600 million photons in order to determine the nature line_10: of noise sources to one part in 24,000. line_13: This test will test performance of fine lock with HSP as well as validate line_14: the FPO fix for HSP. For these reasons the test should be performed line_15: in fine lock, and only scheduled after the FPO fix is operational at the STScI ! question: 7 section: 1 line_1: The data reduction is routine: the raw (star+sky) data are corrected for line_2: dead-time losses (if any) and are converted into count rates. The sky line_3: measurements are also converted into count rates and subtracted from the line_4: (star+sky) data. The reduced data will then be plotted as a time series and line_5: compared with similar time series of other relevant instrumental parameters line_6: (e.g. detector temperature). line_8: The data analysis will consist of two specific approaches: line_10: a) a trend analysis of the various time series to determine the line_11: instrumental hysteresis (if any) and to identify the nature of line_12: irregular noise sources in the data; line_14: b) power spectrum analysis of the various time series to determine the line_15: nature of any periodic components of noise in the data. ! question: 8 section: 1 line_1: No supporting or coordinated observations with other facilities are line_2: anticipated. ! question: 10 section: 1 line_1: Data reduction and analysis will be supported on two computer facilities at the line_2: University of Wisconsin in Madison: line_4: a) a VAX 11/780 computer under the VMS operating system with extensive line_5: application software; line_6: b) a PDP 11/70 computer under the UNIX 2.9 operating system; line_8: Both computer facilities support the FITS tape standards and thus can readily line_9: access the ST-FITS data export products. ! !end of general form text general_form_address: lname: DOLAN fname: JOE mi: F. category: CON inst: GSFC addr_1: CODE 681 city: GREENBELT state: MD zip: 20771 country: USA phone: 301-286-5920 ! lname: PERCIVAL fname: JEFFREY mi: W. category: CON inst: UNIV. OF WISCONSIN addr_1: 1150 UNIVERSITY AVE. city: MADISON state: WI zip: 53706 country: USA phone: 608-262-8686 ! lname: BLESS fname: ROBERT mi: C. category: PI inst: UNIVERSITY OF WISCONSIN addr_1: 475 N. CHARTER STREET city: MADISON state: WI zip: 53706 country: USA phone: 608-262-1715 ! ! end of general_form_address records fixed_targets: targnum: 2 name_1: SAO252703 descr_1: BRIGHT STAR FOR CALIBRATION pos_1: RA=14H 19M 51.61S +/- 1", pos_2: DEC= -61D 16' 22.709" +/- 1" equinox: 2000 pm_or_par: N comment_1: SAO CATALOG TOTAL P.M. = 8.2" fluxnum_1: 1 fluxval_1: V= 5.3, TYPE=A3 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: SAO252703 config: HSP/UV1 opmode: ACQ num_exp: 1 time_per_exp: 0.4S fluxnum_1: 1 priority: 1 param_1: DATA-FORMAT=WORD, req_1: ONBOARD ACQ FOR 2; req_2: CYCLE 2 / 1-2; ! linenum: 2.000 targname: ^ config: HSP/UV1 opmode: SINGLE aperture: 1.0-A sp_element: F240W num_exp: 1 time_per_exp: 3.2H fluxnum_1: 1 priority: 1 param_1: DATA-FORMAT=WORD, param_2: SAMPLE-TIME=0.001, req_1: NON-INT; req_2: PCS MODE F; comment_1: OBSERVATION IN FINE LOCK ONLY. comment_2: NO OBSERVATIONS IN SAA. comment_3: BEGIN WITH STR REWOUND. ! ! end of exposure logsheet ! No scan data records found