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TIPS: 6/11/92 FOS Keyes

Instrument Status Summary:
· FOS continues to function well · Flat Field monitoring continues SV flats described by ISR CAL/FOS-075 BLUEside stable to about 1% REDside flats show granularities on range 1800-2100 A, which have grown at about 10% per year · IVS described by interim ISR REDside stable to 5% between 1991.0 and 1992.2 BLUEside gray degradation at approximately 10% per year · Geomagnetically-induced image-motion problem (GIMP) well understood currently corrected in PODPS pipeline; onboard correction after 9/92 · Onboard ACQs functioning well; ACQ/BIN accuracy 0.25 arc sec · FOS-determined HST blind-pointing 1.0 arc sec for 75% of all FOS ACQs


TIPS: 6/11/92 FOS Keyes

FOS Calibration Activities:

10 April - 7 June 1992

· 2817 - Y-base Map and Monitor · 3975 - Redside Flat Field Monitor ___________________ Week April 13 April 20 May 25 Proposal 2817 3975 3975 Exposures 16 03 03 Results Successful Successful Successful

----- No other calibration activity -----


TIPS: 6/11/92 FOS Keyes

Documentation and Reports: · FOS Instrument Handbook v2.0 (April, 1992) --- A.L. Kinney · FOS ISR CAL/FOS-075 "FOS Spectral Flats" --- S.F. Anderson · FOS interim ISR "Photometric Calibration of the FOS" --- J.D. Neill, R.C. Bohlin, and G. Hartig


TIPS: 6/11/92 FOS Keyes

Data Analysis and CDB Updates: · Continuing analysis of ALL flats with emphasis on REDside granularity. · Monthly delivery of time-tagged REDside flats for G190H, G270H, and G160L. · Delivery of time-tagged IVS reference files. · HST blind-pointing analysis continues --- better than 1 arc sec for 75% of all ACQs


TIPS: 6/11/92 FOS Keyes

Other Items: · 81 Cycle 2 Phase 2 proposals reviewed to date. · FOS onboard ACQ continues routine and reliable given reasonable knowledge of target energy distribution. --- 0.25 arc sec ACQ/BIN or better