（155140）2005 UD 是一个阿波罗型近地小行星，它也被认为是法厄松-双子座流星雨综合体的一员。因此，其自转周期，自转轴指向和形状信息以及相位函数参数对于了解小行星与双子座流星雨之间的关系非常重要。基于我们新得到的11 夜的测光数据和ZTF 数据库中的数据，我们使用Lommel-Seeliger 椭球体模型和𝐻, 𝐺1, 𝐺2 相位函数模型对该对象进行了测光数据分析。通过形状反演，我们得到了该小行星的自转轴指向为(285∘.41, −23∘.36），其自转周期为5.234030h。椭球体的轴向比𝑏/𝑎 和𝑐/𝑎 分别为0.7579 和0.4。基于2005 UD 的校准光度数据，我们拟合了𝐻, 𝐺1, 𝐺2 相位函数，导出的𝐻, 𝐺1, 𝐺2 分别为17.19 mag,0.5728和0.003765。相应地，相位积分𝑞，光度线性系数𝑘 和增强因子𝜁 分别为0.2447,-1.9011 和1.7344。根据𝐺1 和𝐺2 的值，确认2005 UD 为C 型小行星。我们用新得出的𝐻 估算了2005 UD 的等效直径，使用导出的几何反照率为0.14 时，其等效直径为1.3km。
其他摘要
(155140) 2005 UD is an Apollo-type near-Earth asteroid, and it was thought as one member of the Phaethon-Geminids meteor shower Complex. Thus, its rotation period, pole and shape information and the phase function parameters are important for us to understand the relationship between this asteroid with the Geminids. Based on our 11 nights new photometric data and data from ZTF database, we do the photometryanalysis for this object using the Lommel-Seeliger ellipsoid method and 𝐻, 𝐺1, 𝐺2 phase function fitting. As a result of the shape inversion, we derived the pole solution (285∘.41, −23∘.36) with the rotational period of 5.234030h. The axial ratios of ellipsoid 𝑏/𝑎 and 𝑐/𝑎 are 0.7579 and 0.4,respectively. Using the calibrated photometric data of 2005 UD, we fit the 𝐻, 𝐺1, 𝐺2 phase function and derived 𝐻, 𝐺1, 𝐺2 are 17.19 mag,0.5728 and 0.003765 respectively. Correspondingly, the phase integral 𝑞 , photometric phase coefficient 𝑘 and enhancement factor 𝜁 are 0.2447, -1.9011 and 1.7344. From the values of 𝐺1 and 𝐺2, the C-type of 2005 UD is confirmed. We estimated the equivalent diameter of the 2005 UD by the new derived 𝐻, and it is 1.3 km using the derived geometry albedo of 0.14.
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