Abstract

The time and minimum distances of approaches were calculated more than 100 open star clusters (OSCs) near the Solar System over the past 5 Myr. It was shown that the closest proximity of the centers of the OSCs to the Solar System usually exceeded 60 pc. The Hyades cluster approached the Solar System at ~25 pc. The effect of such encounters on the comet motion in the outer regions of the Oort cloud is comparable and may even exceed the effect of encounters with individual stars. The celestial positions of the cluster antiapex were compared with the aphelia of long-period comets. Cases of its close positions were revealed for some comets and the interstellar asteroid 1I/2017 U1 (Oumuamua). The frequency of OSC passages in the vicinity of the Solar System was estimated. Encounters at a distance of 25 pc occur at a rate of ~20 times per billion years.

中文翻译：

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太阳系遭遇开放星团

摘要

在过去的5 Myr内，计算出了进近的时间和最小距离，结果是太阳系附近有100多个开放星团（OSC）。结果表明，OSC中心到太阳系的最接近距离通常超过60 pc。海德斯星团以约25％的速度接近太阳系。这种相遇对奥尔特云外围区域彗星运动的影响是可比的，甚至可能超过与单个恒星相遇的影响。将抗结簇簇的天体位置与长周期彗星的无性生殖相比较。在一些彗星和星际小行星1I / 2017 U1（Oumuamua）上发现了其近距离位置的案例。估计了太阳系附近OSC通道的频率。相距25 pc的以每十亿年20倍的速度发生。