Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.5057j&link_type=abstract
HST Proposal ID #5057
Computer Science
Hst Proposal Id #5057
Scientific paper
The goal of this project is the determination of the rotation of the HIPPARCOS Reference Frame with respect to an Extragalactic Frame. The program will derive the internal optical motions of extragalactic objects (QSOs, BL Lacs, AGNs) at the +/- 0.002 arcsecond per year level of accuracy. 160 SAO stars within the FGSFOV of all selected QSOs, BL Lacs, and AGNs are included in the HIPPARCOS catalog. Ground based speckle observations have been used to pre-detect doubles which would cause problems for the FGS. The FGSs will measure the relative positions of SAO stars with respect to objects brighter than 17 mag. Fainter objects will be observed with the WFPC and FGS together. The objects have been selected in conjunction with the recommendations of the IAU working group in Radio/Optical Identifications, and have been selected for compactness and intensity. Most of the objects are recommended as ultimate position calibrators.
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