Abstract

The orbit of an active asteroid (457175) 2008 GO98/362P was obtained taking into account non-gravitational acceleration based on the Marsden model. The presence of systematic deviations was revealed in the 2016 observations prior to the cometary activity. The possibility of a collision with a minor body was considered. For this, the momenta of reaching the minimum distances (MOID, Minimum Orbit Intersection Distance) between the orbits of the asteroid (457175) and 585 961 numbered, and 536 561 unnumbered asteroids (according to the status in the Minor Planet Center catalogs of observations as of October 2021) were found. The maximum number of orbital rendezvouses falls on the time when the asteroid was passing in the vicinity of the ascending node, which suggests the possibility of a collision leading to the fragmentation of the main body. Two separation scenarios are considered and orbit variation of the main body and possible fragments are estimated. For the formed fragment, the heliocentric velocity variation amounted to \(dv=0.148\) m s\({}^{-1}\) and non-gravitational acceleration was \(A_{3}=-12.5\times 10^{-8}\) AU day\({}^{-2}\). The main body dynamics did not vary significantly.

中文翻译：

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小行星 (457175) 2008 GO98/362P 活动的成因

摘要

活动小行星 (457175) 2008 GO98/362P 的轨道是根据马斯登模型在考虑非重力加速度的情况下获得的。在彗星活动之前的 2016 年观测中揭示了系统偏差的存在。考虑了与小物体发生碰撞的可能性。为此，小行星 (457175) 和 585 961 的轨道之间达到最小距离（MOID，最小轨道相交距离）的动量已编号，536 561 未编号的小行星（根据小行星中心观测目录中的状态）截至 2021 年 10 月）被发现。轨道交会的最大数量落在小行星经过升交点附近的时间，这表明可能发生碰撞导致主体碎裂。考虑了两种分离情景，并估计了主体和可能碎片的轨道变化。对于形成的碎片，日心速度变化为\(dv=0.148\) ms \({}^{-1}\)和非重力加速度为\(A_{3}=-12.5\times 10^{-8}\) AU day \({} ^{-2}\)。主体动力学没有显着变化。