FOC Plate Scale - Revised

Details FOC Plate Scale - Revised FOC Plate Scale - Revised

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4231p&link_type=abstract

HST Proposal ID #4231

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #4231

Scientific paper

The aim of these observations is to allow the platescale of the FOC f/48 and f/96 cameras to be monitored. This will be achieved by imaging a pair of astrometric stars (separation ~10.5") in the full (512x1024 zoomed) format. A sequence of exposures will be obtained using each relay at positions with known angular offsets. The offsets combined with the astrometric separation will serve to unambiguously define the platescale for both relays. The observations will be analyzed off-line using CDBS and the analysis will be used to update the FOC reference files in SOGS. These observations will be combined with an observation of the center of 47-Tuc in order to determine the separation of stars in 47-Tuc. Future monitoring of the FOC's plate scale will use single observations of 47-Tuc for comparisions; this will be much more efficient the current method. It is intended to run this proposal at intervals of 4-6 months until such timeas it is clearly no longer required.

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