Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6174l&link_type=abstract
HST Proposal ID #6174
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #6174
Scientific paper
The goal of these activities is to calibrate the changes to the optical field angle distortions (OFAD) of FGS unit #3. This calibration will return the knowledge of the OFAD, to within an arbitrary scale factor, to a level of accuracy sufficient to support an overall astrometry error budget of +/- 0.0027 arcseconds rms. The actual solutions will provide the Project Data Base with the signifi- cant terms, their values, and their covariances including errors, which may then be applied to general FGS observations to reduce them for field angle distortions, except scale, alignment, and color cor- rections.
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