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Confirmation of Errors in Hipparcos Parallaxes from HST/FGS Astrometry of the Pleiades
David R. Soderblom, Ed Nelan, G. Fritz Benedict +4
We present absolute trigonometric parallaxes and relative proper motions for three members of the Pleiades star cluster, obtained with HST's Fine Guidance Sensor 1r, a white-light…
Astrometric Discovery of GJ 164B
Steven H. Pravdo, Stuart B. Shaklan, Todd Henry +1
We discovered a low-mass companion to the M-dwarf GJ 164 with the CCD-based imaging system of the Stellar Planet Survey (STEPS) astrometric program. The existence of GJ 164B was co…
An HST parallax of the distant cataclysmic variable V1223 Sgr, its system parameters, and accretion rate
K. Beuermann, Th. E. Harrison, B. E. McArthur +2
Using the Hubble space Telescope Fine Guidance Sensor, we have measured the trigonometric parallax of the bright cataclysmic variable 1223 Sgr. The absolute parallax is pi(abs)= 1.…