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arXiv 2103.06850astro-ph.EP
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用GAIA DR2确定小行星H和G相函数参数

The determination of asteroid H and G phase function parameters using GAIA DR2

Milagros Colazo, Rene Duffard, Walter Weidmann

摘要:

盖亚飞行任务将为科学界提供对所有类别小行星的高质量观测。盖亚数据的第二次发布(DR 2)于2018年发布,包括对14,099个已知太阳系天体(主要是小行星)的22个月观测。这项工作的目的是获得盖亚飞行任务观测到的所有小行星的相函数参数(H和G)目录,这些参数已在DR 2中公布。为此,我们引入了一种算法,能够从DR2数据库中的震级和UTC历元数据构建此目录。由于盖亚永远不会观测到相位角为0°(对应于冲)的小行星,但相位角大于10°,因此我们增加了地面观测数据(对应于小相位角),从而改进了相位函数的$H$和$G$参数的确定。在这种情况下,我们还建立了H,G1,G2相函数的参数目录。我们比较了我们的H,G函数的结果与Astorb数据库,并观察到协议的水平是令人满意的。

英文摘要:

The Gaia mission will provide the scientific community with high-quality observations of asteroids of all categories. The second release of Gaia data (DR2) was published in 2018 and consisted of 22 months of observations of 14,099 known Solar System objects, mainly asteroids. The purpose of this work is to obtain a catalogue of phase function parameters (H and G) for all the asteroids that are observed by the Gaia mission, and which were published in DR2. For this purpose, we introduced an algorithm capable of building this catalogue from the magnitude and UTC epoch data present in the DR2 database. Since Gaia will never observe asteroids with a phase angle of 0° (corresponding with the opposition), but with phase angles higher than 10°, we added data from ground observations (corresponding to small phase angles) and thus improved the determination of the $H$ and $G$ parameters of the phase function. In this case, we also build a catalogue of the parameters of the H, G1, G2 phase function. We compared our results of the H, G function with those of the Astorb database and observed that the level of agreement is satisfactory.

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