Computer Science – Performance
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21420104l&link_type=abstract
American Astronomical Society, AAS Meeting #214, #201.04; Bulletin of the American Astronomical Society, Vol. 41, p.709
Computer Science
Performance
Scientific paper
KeplerCam was originally built to carry out a survey of the Kepler field of view to provide multi-band photometry for the stellar classification of potential targets in the Kepler Input Catalog. It utilizes a Fairchild CCD 486 on the 1.2-m telescope at the Whipple Observatory on Mount Hopkins to cover a field of 23' with 0.33" pixels. KeplerCam has proven to be especially effective for obtaining high-quality light curves of transiting systems identified by ground-based surveys such as TrES and HATNet, and it is now scheduled for this type of work by three teams on more than 75% of the nights. KeplerCam has been used to obtain light curves for stars in the V magnitude range 8 to 14. At the bright end the photometric performance can approach 1 mmag in 1 min, but is limited by scintillation. At the faint end the corresponding limit is set by photon statistics. The best results require photometric skies with consistently good seeing. Co-adding light curves for the same target on different nights has achieved a performance of 0.2 mmag in 15 min bins under ideal conditions. Larger ground-based telescopes with optimized cameras promise performance better than this, in time resolution as well as photometry, but the competition for large amounts of time on such facilities will be stiff.
Partial support from the Kepler mission under NASA Cooperative Agreement NCC2-1390 is gratefully acknowledged.
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