Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5012s&link_type=abstract
American Astronomical Society, DPS meeting #39, #50.12; Bulletin of the American Astronomical Society, Vol. 39, p.514
Astronomy and Astrophysics
Astronomy
Scientific paper
The Lincoln Near-Earth Asteroid Research program (LINEAR) has been archiving all survey images since late 2002. We have now accumulated 4.5 years of survey data amounting to about 4.5 million images, each 2 square degrees. The images range in limiting magnitude from mCCD 17 to mCCD 19.5 depending on the season and sky conditions. Approximately 32,000 square degrees of the sky are covered, essentially all of the sky with -30° < δ < 81°. All fields within that area have been imaged multiple times and some areas have been imaged as many as 600 times. From these data, we are extracting photometric measurements, in the broad CCD bandpass, for all detectable stars. Stars detected in overlap regions between adjacent images ( 1% of the field of view on all four sides) will provide relative photometric calibrations between fields. To convert the relative magnitude system to an absolute calibration we are converting Sloan Digital Sky Survey photometric observations of stars into the LINEAR bandpass and comparing those synthetic magnitudes with the measured magnitudes. We anticipate extracting magnitudes for 200 million stars and expect to achieve 5% accuracy in the photometry over most of the brightness range. This catalog will serve as the basis of photometric calibration for future LINEAR asteroid observations, as well as for recalibrating the photometry for the roughly 12 million asteroid observations contained in the archived data.
This work is sponsored by the National Aeronautics and Space Administration (NRA No. NNH06ZDA001N, 06-NEOO06-0001) under Air Force Contract FA8721-05-C-0002. Opinions, interpretations, conclusions, and recommendations are those of the author and are not necessarily endorsed by the United States Government.
Stuart Joseph
Szabo Andras
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