Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21742501s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #425.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We describe a new concept for space astrometry that enables a 1m class telescope achieve 0.8 uas accuracy in a 1hour observation. The astrometric detection of ExoEarths requires submicroarcsec astrometric accuracy that is very challenging for several reasons. First photon noise of the reference stars means that the product of the telescope aperture and field of view should be at least 1m2 and 0.5 deg field of view. A traditional approach to achieving such a large field is to use a TMA telescope.But traditional telescope such as Cassagrain or TMA have a problem called beam walk that can cause milliarcsec of astrometric error over a 0.5 deg field. The other major challenge to sub-microarcsec astrometry over 0.5deg field is the stability of the very large ccd focal plane. We describe here a new approach to solving these problems that avoids the optical beam walk errors and uses laser metrology to measure the location of the pixels in the focal plane with 1 uas, 100picometer accuracy. Preliminary data from a lab experiment demonstrating subnanometer location of pixels will be discussed.
Catanzerite J.
Goulliard R.
Marr James
Nemati Bijan
Pan Xiaochuan
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