Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8524n&link_type=abstract
HST Proposal ID #8524
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #8524
Scientific paper
This proposal will acquire the data needed to calibrate FGS2r's Optical Field Angle Distortion {OFAD} to a level of precision required to operate the FGS2r as a guiding instrument. HST will be pointed so as to cause selected stars in an astrometric cluster to be distributed through out the FGS2r full FOV or pickle. The apparent relative positions of these stars will be measured by a sequence of Position Mode observations. In each of 5 orbits, each with a different pointing, about 15 stars will be observed. Their apparent relative positions will be compared to the astrometric catalog and the OFAD will be calibrated to remove such differences. We expect that the data acquired from this proposal will calibrate FGS2r's OFAD to about 20 mas, which is adequate for operations.
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