Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734804z&link_type=abstract
American Astronomical Society, AAS Meeting #217, #348.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The Navy Prototype Optical Interferometer (NPOI) is completing a wide-angle astrometric catalog of bright (v<= 5 mag) stars with a goal of absolute positions good to 15 mas. Narrow-angle astrometric observations with a single-mirror telescope of these bright stars against a fainter (v> 12) reference catalog will be used as one assessment of the accuracy of the interferometric catalog. I will present observations of bright radio stars seen through a 9-magnitude neutral density spot and compare these observed positions against the current epoch predicted HIPPARCOS positions. These radio star observations, and some observations of extragalactic objects, form our initial check of our narrow-angle astrometry. Other uses of these observations include relative astrometry to detect orbital perturbations from companions to verify duplicity or improve previously determined orbits.
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