Multi-day Near-Earth Asteroid CCD Photometry Using the USNO B.10 Catalog

Details Multi-day Near-Earth Asteroid CCD Photometry Using the USNO B.10 Catalog Multi-day Near-Earth Asteroid CCD Photometry Using the USNO B.10 Catalog

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3516r&link_type=abstract

American Astronomical Society, DPS meeting #39, #35.16; Bulletin of the American Astronomical Society, Vol. 39, p.484

Astronomy and Astrophysics

Astronomy

Scientific paper

In 2003, we expanded our astrometric Near Earth Object (NEO) confirmation and follow-up observations at McDonald Observatory to include CCD-based R-band photometry of selected asteroids. Since then, we obtained lightcurves for 17 asteroids, including four Potentially Hazardous Objects. We were able to determine rotational periods and lightcurve amplitudes for 2002 EZ11, 2001 CC21, 16821, 86018 and 138971. We also derived approximate periods for 2003 SS84 and 137052 using Singular Spectrum Analysis, which has proven to perform well on short, noisy time series. To determine the periods, we used observations gathered on multiple, but not necessarily consecutive, nights.
We used the USNO B1.0 Astrometric catalog for the reference stars and found that using the catalog values eliminated the need for introducing arbitrary biases between separate nights. Although the catalog was not designed to be photometric, we were able, using a large number of reference stars and removing outliers from the photometric fit, to reduce the random errors to 0.015 magnitudes or less. Most of the remaining scatter in our data can be attributed to the fact that, as the asteroid moves across the sky, nearby stars contaminate the measurements.
This research is funded by NASA's NEO Observation Program Grant NNG04G124G.

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