Surface heterogeneity of 2005 UD from photometric observations

Details Surface heterogeneity of 2005 UD from photometric observations Surface heterogeneity of 2005 UD from photometric observations

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...466.1153k&link_type=abstract

Astronomy and Astrophysics, Volume 466, Issue 3, May II 2007, pp.1153-1158

Astronomy and Astrophysics

Astrophysics

11

Minor Planets, Asteroids, Comets: General, Meteors, Meteoroids, Techniques: Photometric

Scientific paper

Context: The recently discovered Apollo-type near-Earth asteroid 2005 UD has been suggested to be a fragment of (3200) Phaethon. Aims: To test this hypothesis, we carried out photometric observations of 2005 UD using the 1-m telescope at Lulin Observatory. Methods: Multi-color photometry was used to compare the surface properties of (3200) Phaethon and 2005 UD. Surface-color variation due to the rotation was also examined. Results: The time-resolved differential photometry showed clear brightness variation, and the lightcurve was fitted with a rotation period of 5.23 h and an amplitude of 0.44 mag. Using this rotational lightcurve, we derived the surface colors of 2005 UD. The surface of 2005 UD exhibits colors similar to those of F- and B-type asteroids, which is consistent with (3200) Phaethon. Furthermore, the (R-I) color of 2005 UD shows variation during the rotation of the body. Conclusions: The similarity of surface colors between (3200) Phaethon and 2005 UD observationally supports the hypothesis that 2005 UD is likely to be a fragment of (3200) Phaethon. A simple explanation for the inhomogeneity of the surface is that we see the surface and subsurface of the precursor object. Another explanation is the topographical structure that such as a large crater causes on this heterogeneous surface.

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