论文标题
GAIA-DR2小行星观测和pop行星胚层
Gaia-DR2 asteroid observations and INPOP planetary ephemerides
论文作者
论文摘要
我们使用InPop19a行星胚膜来基于GAIA-DR2观测来对14099小行星进行轨道调整,并比较其中23个所得轨道与雷达数据。由于使用行星埃弗默里斯INPOP10E处理了GAIA-DR2,因此本文的主要目标是在使用更新版本的太阳系模型时确认数据的可移植性。特别是,我们指出的事实是,在使用另一个行星埃弗米斯时,必须纠正Gaia卫星位置 - 相对于INPOP10E太阳系Barycenter提供的事实。我们还提出了一种方便的最低方形形式,只能处理小矩阵,并允许调整全球参数,例如质量。为了检查Gaia观测值与其他类型的观测值的一致性,我们在组合GAIA和雷达范围观测值的23个对象的情况下进行了轨道调整,以及仔细的拟合后分析,包括估计Gaia系统误差。最后,我们表明,为了确保Gaia Angular DR2观测值和雷达范围的联合使用,比首先提出的动态建模更开发,以及在拟合过程中增加系统的Gaia偏置。这些结果为下一个Gaia递送的结果提供了有希望的指导,GAIA-DR3。
We used the INPOP19a planetary ephemerides to perform the orbital adjustment of 14099 asteroids based on Gaia-DR2 observations, and compare for 23 of them the resulting orbits to radar data. As Gaia-DR2 has been processed using the planetary ephemeris INPOP10e, the primary goal of this paper is to confirm the portability of the data when using an updated version of the solar system model. In particular, we point out the fact that the Gaia satellite positions -- provided with respect to the INPOP10e solar system barycenter -- must be corrected when using another planetary ephemeris . We also present a convenient least square formalism that only handles small matrices and allows the adjustment of global parameters, such as masses. In order to check the consistency of the Gaia observations with other types of observations, we perform an orbital adjustment in combining Gaia and radar range observations for 23 objects, together with a careful post-fit analysis including an estimation of the Gaia systematic errors. Finally, we show that to ensure the combined use of Gaia angular DR2 observations and radar ranging, a more developed than firstly proposed dynamical modeling is required together with the addition of the systematic Gaia bias in the fit procedure.These results give promising directions for the next Gaia delivery, Gaia-DR3.