Calibrating FGS1R's Optical Field Angle Distortion {OFAD}, Second Epoch

Details Calibrating FGS1R's Optical Field Angle Distortion {OFAD}, Second Epoch Calibrating FGS1R's Optical Field Angle Distortion {OFAD}, Second Epoch

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11870n&link_type=abstract

HST Proposal ID #11870. Cycle 17

Physics

Scientific paper

This proposal gathers the data needed to calibrate the optical field angle distortions in FGS1r to the level of accuracy required for astometry science. Selected stars from the galactic cluster M35 are repeatedly observed in POSITION mode by FGS1r with F583W filter at a variety of spacecraft pointings and telescope roll angles. Ideally the observations are to occur at a time when this ecliptic star field is near the anti-sun direction so that HST's roll angle is unconstrained. Unfortunately this is not possible under two gyro operations. Therefore, the observations in this proposal are somewhat very constrained in roll. However, this test should suffice as an adequate update to the original FGS1r OFAD that executed in December 2000. For each visit, the desired telescope pointing is specified by POS TARG and ORIENT special requirements.;

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