Astrometry with the Keck-Interferometer: the ASTRA project and its science
2009
The sensitivity and astrometry upgrade ASTRA of the Keck Interferometer is introduced. After a brief
overview of the underlying interferometric principles, the technology and concepts of the upgrade are
presented. The interferometric dual-field technology of ASTRA will provide the KI with the means to
observe two objects simultaneously, and measure the distance between them with a precision eventually
better than 100 µas. This astrometric functionality of ASTRA will add a unique observing tool to fields of
astrophysical research as diverse as exo-planetary kinematics, binary astrometry, and the investigation of
stars accelerated by the massive black hole in the center of the Milky Way as discussed in this
contribution.
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