寻找与太阳系近距离相遇的恒星
Searching for Stars Closely Encountering with the Solar System
摘要：
基于新版本的依巴谷星表和目前可用的径向速度数据，我们搜索了在-200万年到+200万年的时间间隔内，在不到3 pc的时间内已经遇到或将要遇到太阳邻域的恒星。在30秒差距内发现了9个新的候选天体，为了构造恒星相对于太阳轨道的轨道，我们采用了周转近似。我们表明，考虑到观测数据中的误差，在1.45-+0.06百万年的时间间隔内，与太阳最接近的著名恒星HIP 89 825（GL 710）落入奥尔特云的概率为0.86。这颗恒星也有一个非零的概率，0.0001，落入d<1000 AU的区域，在那里它对柯伊伯带天体的影响成为可能。
英文摘要：
Based on a new version of the Hipparcos catalog and currently available radial velocity data, we have searched for stars that either have encountered or will encounter the solar neighborhood within less than 3 pc in the time interval from -2 Myr to +2 Myr. Nine new candidates within 30 pc of the Sun have been found. To construct the stellar orbits relative to the solar orbit, we have used the epicyclic approximation. We show that, given the errors in the observational data, the probability that the well-known star HIP 89 825 (GL 710) encountering with the Sun most closely falls into the Oort cloud is 0.86 in the time interval 1.45-+0.06 Myr. This star also has a nonzero probability, 0.0001, of falling into the region d<1000 AU, where its influence on Kuiper Belt objects becomes possible.
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