Surface heterogeneity of 2005 UD from photometric observations
Surface heterogeneity of 2005 UD from photometric observations
复制标题
DOI：
10.1051/0004-6361:20066276
复制
发表时间：
2007-05
影响因子：
6.5
通讯作者：
D. Kinoshita;K. Ohtsuka;T. Sekiguchi;J. Watanabe;Takashi Ito;H. Arakida;T. Kasuga;S. Miyasaka;R. Nakamura;H. C. Lin
中科院分区：
文献类型：
--
作者：
D. Kinoshita;K. Ohtsuka;T. Sekiguchi;J. Watanabe;Takashi Ito;H. Arakida;T. Kasuga;S. Miyasaka;R. Nakamura;H. C. Lin
上下文。最近发现的阿波罗型近地小行星2005 UD被认为是Phaethon（3200）的碎片。目标。为了验证这一假设，我们利用芦林天文台的1米望远镜对2005年UD进行了光度观测。方法。采用多色光度法比较了（3200）Phaethon与2005 UD的表面性质。由于旋转引起的表面颜色变化也被检查。结果。时间分辨差分光度法显示出明显的亮度变化，光曲线的旋转周期为5.23 h，振幅为0.44等。利用这一旋转光曲线，我们推导出了2005 UD的表面颜色。2005 UD的表面呈现出与F型和b型小行星相似的颜色，这与（3200）Phaethon一致。此外，2005年UD的（R - I）颜色显示了身体旋转过程中的变化。结论。在观测上，（3200）Phaethon和2005 UD表面颜色的相似性支持了2005 UD可能是（3200）Phaethon碎片的假设。对表面不均匀性的一个简单解释是，我们看到了前体物体的表面和地下。另一种解释是地形结构，比如在这个不均匀的表面上有一个巨大的陨石坑。
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.