Astrometry Verifications and Tests; AST-OV-20 (repeat 2185)

Details Astrometry Verifications and Tests; AST-OV-20 (repeat 2185) Astrometry Verifications and Tests; AST-OV-20 (repeat 2185)

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3927j&link_type=abstract

HST Proposal ID #3927

Other

Hst Proposal Id #3927

Scientific paper

The goal of this test is to 1) verify that each FGS filter wheel position as commanded actually results from the command. This is required for any observations requiring a filter other than the "clear" filter. 2) verify that the FGSs will be able to observe stars of different magnitudes by using different integration sample times. The test will be coordinated with P-E. Successful conclusion of this test is required for astrometry on objects fainter than the Guide Star limit. 3) determine if objects fainter than the nominal 17.0 magnitude limit can be observed with the FGSs. The nominal limit may be used as a guide line, but the magnitudes may be uncertain by a magnitude. 4) verify the ability of the FGSs to obtain astrometric data on a 17th and 16th magnitude star which will allow its relative position to be determined to 0.002" in one minute. 5) determine the effects of varying FGE NFES Slope in transiting from coarse track to fine lock, on the statistical nature of the astrometric data, and on the parameters which allow acquisition of astrometric targets with different characteristics (FGS 3 and 1 only. FGS 2 completed). Test has been slightly modified to reflect partial success of first run of 2185. Transfer scans and 2/3 aperture have been added to magnitude limit sub-test. 2/3 aperture observations added to Verify Integration Times sub-test.

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