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arXiv 2203.01586astro-ph.EPastro-ph.IM
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Gaia-DR2小行星观测和INPOP行星星历

Gaia-DR2 asteroid observations and INPOP planetary ephemerides

P. Deram, A. Fienga, A. K. Verma, M. Gastineau, J. Laskar

摘要:

我们使用INPOP 19 a行星星历进行轨道调整的14099小行星的基础上Gaia-DR 2观测,并比较其中23个产生的轨道雷达数据。由于盖亚-DR 2已经使用行星星历INPOP 10 e处理,本文的主要目标是确认数据的可移植性时,使用更新版本的太阳系模型。特别是,我们指出的事实,盖亚卫星的位置-提供相对于INPOP 10 e太阳系重心-必须进行校正时,使用另一个行星星历。我们还提出了一个方便的最小二乘形式主义,只处理小矩阵,并允许调整全局参数,如群众。为了检查盖亚观测与其他类型的观测的一致性,我们进行了轨道调整,结合盖亚和雷达距离观测的23个对象,连同一个仔细的后拟合分析,包括估计盖亚系统误差。最后,我们表明,为了确保盖亚角DR 2观测和雷达测距的结合使用,一个更发达的比第一次提出的动力学建模是需要的,连同在拟合过程中的系统盖亚偏差,这些结果为下一个盖亚交付,盖亚DR 3有希望的方向。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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