Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530505m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #305.05; Bulletin of the American Astronomical Society, Vol. 42, p.302
Astronomy and Astrophysics
Astronomy
Scientific paper
The Kepler Mission was not designed to obtain high precision astrometric measurements, but the excellent design of the photometer enables such analysis. Preliminary results based on the first six weeks of data will be presented. The astrometric processing is based on the long cadence pixel data as calibrated by the Science Operations Center for each of the Kepler targets for each of the 30-minute co-additions. Centroids are computed using a variety of algorithms because the process for finding the best algorithm is as yet incomplete. Given the centroids, traditional astrometric processing that computes the transformations from each channel for each cadence (plate constants for us old-timers) and the astrometric model for each star is done. Although the algorithm development is still in its infancy, the results so far are quite encouraging. Astrometric residuals in the range of 2.0 milliarcseconds (0.0005 pixels) are common. Even more encouraging is the demonstration that the astrometric accuracy continues to scale as the image size divided by the signal-to-noise ratio (SNR) even for the extremely high SNR images delivered by the Kepler photometer. Details of the processing and the latest results will be presented. Kepler was selected as the 10th mission of the Discovery Program. Funding for this mission is provided by NASA, Science Mission Directorate.
Bryson Steve T.
Dotson Jessie L.
Dunham Edward
Gilliland Ron L.
Haas Michael R.
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