Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9190b&link_type=abstract
HST Proposal ID #9190
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #9190 Cold Stars
Scientific paper
The analysis we propose will complete the commissioning of FGS1r as a sub-milliarcsecond astrometric science instrument for Cycle 10 and all future HST cycles, and permit the final reduction and analysis of 100 orbits of FGS1r data acquired by a variety of GO programs during HST Cycles 8 and 9. As our team consists of members from the original astrometry Instrument Definition Team {STAT} and STScI's FGS Instrument Scientist, we have already performed this calibration for FGS3, and we are uniquely qualified to do so for FGS1r. Using data obtained from an approved FGS1r Cycle 8 Calibration program {Prop 8469}, we will map the optical field angle distortions of FGS1r to facilitate the goal of millisecond of arc precision astrometry for FGS1r's Position Mode. Our results will populate the FGS1r calibration database and will be available to all FGS GOs through the use of STScI's calibration pipeline. A second result will be an improved M35 calibration field, one that takes into account proper motions in the catalog. This will allow for more accurate monitoring of the FGS1r plate scale and distortions during future HST cycles.
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