论文标题
近地小行星的光度研究（155140）2005 UD
Photometric study for near-Earth asteroid (155140) 2005 UD
论文作者
论文摘要
Apollo型接近地球小行星（155140）2005 UD被认为是Phaethon-Geminid Meteor流综合体（PGC）的成员。它的基本物理参数对于揭示其起源以及与其他PGC成员以及双子流的关系至关重要。采用Lommel-Seeliger椭圆形方法和$ H，G_1，G_2 $相位功能，我们使用2005年UD的光度数据进行旋转，形状和相位曲线反转。数据包括从次要行星中心下载的11个新的Lightcurves，3个LightCurves，以及从Zwicky Transient设施数据库下载的166个稀疏数据点。结果，我们得出了（$ 285^\ circ.8^{+1.1} _ { - 5.3} $，$ -25^\ Circ.8^{+5.3} _ {+5.3} _ { - 12.5} $）在旋转期为$ 5.2340 $ 5.2340 $ h的ecliptic frage in J2000.0。相应的三轴形状（semiaxes $ a> b> c $）估计为$ b/a = 0.76^{+0.01} _ { - 0.01} $和$ c/a = 0.40^{+0.03} _ { - 0.01} $。使用$ H，G_1，G_2 $参数的校准光度数据估计为$ 17.19^{+0.10} _ { - 0.09} $ MAG，$ 0.573^{+0.088} _ {+0.088} _ { - 0.069} $ 0.069} $ 0.2010}相应地，相位积分$ q $，光度相位系数$ k $和增强因子$ζ$为0.2447，-1.9011和0.7344。从$ g_1 $和$ g_2 $的值中，2005年UD可能是C型小行星。我们从新的$ h $ value估算了2005年UD的等效直径：使用0.14的新几何反照率为1.30公里。
The Apollo-type near-Earth asteroid (155140) 2005 UD is thought to be a member of the Phaethon-Geminid meteor stream Complex (PGC). Its basic physical parameters are important for unveiling its origin and its relationship to the other PGC members as well as to the Geminid stream. Adopting the Lommel-Seeliger ellipsoid method and $H,G_1,G_2$ phase function, we carry out spin, shape, and phase curve inversion using the photometric data of 2005~UD. The data consists of 11 new lightcurves, 3 lightcurves downloaded from the Minor Planet Center, and 166 sparse data points downloaded from the Zwicky Transient Facility database. As a result, we derive the pole solution of ($285^\circ.8^{+1.1}_{-5.3}$, $ -25^\circ.8^{+5.3}_{-12.5}$) in the ecliptic frame of J2000.0 with the rotational period of $5.2340$ h. The corresponding triaxial shape (semiaxes $a>b>c$) is estimated as $b/a= 0.76^{+0.01}_{-0.01}$ and $c/a=0.40^{+0.03}_{-0.01}$. Using the calibrated photometric data of 2005 UD, the $H,G_1,G_2$ parameters are estimated as $17.19^{+0.10}_{-0.09}$ mag, $0.573^{+0.088}_{-0.069}$, and $0.004^{+0.020}_{-0.021}$, respectively. Correspondingly, the phase integral $q$, photometric phase coefficient $k$, and the enhancement factor $ζ$ are 0.2447, -1.9011, and 0.7344. From the values of $G_1$ and $G_2$, 2005 UD is likely to be a C-type asteroid. We estimate the equivalent diameter of 2005 UD from the new $H$-value: it is 1.30 km using the new geometric albedo of 0.14.
