Computer Science – Databases
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8526n&link_type=abstract
HST Proposal ID #8526
Computer Science
Databases
Hst Proposal Id #8526
Scientific paper
This proposal assesses the impact of the SM3a activities on the operational calibration databases of FGS1r and FGS3. Specifically, the optical field angle distortion {OFAD}, plate scale, and interferometric response of these two FGSs will be compared to pre-SM3a calibrations. The OFAD and plate scale data will be obtained by POS mode observations of selected astrometric stars {in M35} distributed across the FGS FOV. The interferometric data wil be acquired by TRANS mode observations of a standard single star {Upgren 69} at the center of the FGS FOV. These data will be compared to similar pre-SM3a data obtained as part of the routine FGS science calibration monitoring program. If the OFAD and plate scale have not changed by more that 20 mas over the FOV, then the operational calibration database will be judged to remain valid. If larger changes are seen, then the issue will be brought forward to management. If the interferometric response has changed by more that 15% {in PUPIL}, then further tests might be needed to update the commanding database.
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