Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943213g&link_type=abstract
American Astronomical Society, AAS Meeting #219, #432.13
Astronomy and Astrophysics
Astronomy
Scientific paper
We present preliminary results of data collected on asteroid 2005 YU55 between November 13 and November 18 using the McDonald Observatory 0.76m telescope with the Prime Focus Corrector. This asteroid, which passed just within the Moon's orbit on November 8, 2011, was also observed by radio telescopes at Arecibo and Goldstone. We will complement the radar observations by providing colors as a function of the rotational phase. We have obtained CCD images spanning a total of 38.5 hours. The exposures through the B, V, R and I filters were spaced to sample the estimated 18-hour rotational period (based on Arecibo radar observations obtained in April 2010). The majority of the images were taken through the Bessel R filter in order to refine the rotation period. The phase coverage in colors is not quite even, but we can calculate colors for 5 or 6 different phases (depending on the actual rotational period). We have observed Landolt photometric standards to calibrate the target either directly or by calibrating the reference stars imaged with the targets.
This work was supported by the Planetary Group at UT Austin, Department of Astronomy.
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