HST FGS astrometry the value of fractional millisecond of arc precision

Details HST FGS astrometry the value of fractional millisecond of arc precision HST FGS astrometry the value of fractional millisecond of arc precision

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..248...23b&link_type=abstract

A Giant Step: from Milli- to Micro-arcsecond Astrometry, Proceedings of the International Astronomical Union, IAU Symposium, Vol

Astronomy and Astrophysics

Astronomy

4

Astrometry, Cepheids, Distance Scale, Planetary Systems, Stars: Low-Mass, Brown Dwarfs

Scientific paper

In a few years astrometry with the venerable combination of Hubble Space Telescope and Fine Guidance Sensor will be replaced by SIM, Gaia, and long-baseline interferometry. Until then we remain a resource of choice for sub-millisecond of arc precision optical astrometry. As examples we discuss 1) the uses which can be made of our parallaxes of Galactic Cepheids, and 2) the determination of perturbation orbital elements for several exoplanet host stars, yielding true companion masses.

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