Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.1501q&link_type=abstract
American Astronomical Society, IAU Symposium #261. Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Ana
Astronomy and Astrophysics
Astronomy
Scientific paper
Optical / infrared interferometers are very suitable tools for precise astrometric measurements. For ground-based instruments the achievable accuracy is limited by the Earth's atmosphere. Wide-angle astrometry benefits from multi-color measurements that reduce the atmospheric errors, but is still limited to roughly one milliarcsecond. Narrow-angle astrometry from the ground can yield much more accurate measurements of relative motions between a group of objects that are close to each other on the sky. About 10 microarcseconds should be achievable for angular separations of a few arcseconds, provided that instrumental and atmospheric error sources are eliminated systematically. The two most important applications of this technique are searches for extrasolar planets, and the analysis of motions of stars orbiting the black hole at the center of our Galaxy.
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