Computer Science – Performance
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921012t&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #210.12; Bulletin of the American Astronomical Society,
Computer Science
Performance
Scientific paper
Kepler is NASA’s first mission capable of finding extra-solar terrestrial planets that are Earth-size and smaller. The instrument includes a high gain antenna that is bolted in a fixed position on the satellite. Thus, the satellite will be rotated in order to point the antenna at Earth for transmission, an operation that will occur approximately once a month. In between Earth pointing communication with Kepler is also possible using a low gain antenna via X-band, normally used for up-link of commands and down-link of engineering data. Some of this band pass is reserved for pixel data as well, making limited amount of science data available for quick look analysis about twice a week.
Quick look software analyzes instrument health and performance as soon as possible after the data are obtained using the pixel data from X-band. The performance assessments are based on examination of time series data generated by the software, and include stellar brightness, centroid locations, plate scale, encircled energy, background flux values, CCD black, smear, and dark current levels, CCD dynamic range, and attitude solution. A more detailed analysis will be performed after the monthly down-link of all science data. New time series analyzed then include cosmic ray hit rate, CCD hot pixel formation rate, and combined differential photometric precision. All the metrics calculated for quick look will be reanalyzed at higher precision and higher time resolution.
The Kepler mission is funded by NASA’s Discovery Program
Borucki William. J.
Caldwell Doug
Jenkins Jennifer
Topka Kenneth
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