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Solar System Encounters with Open Star Clusters

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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.

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ACKNOWLEDGMENTS

This study used the SIMBAD Astronomical Database, CDS, Strasbourg, France [26]. We are also grateful to J. Bovy from the Department of Astronomy and Astrophysics at the University of Toronto for his valuable advice, in particular, regarding the galpy package.

Funding

The study is funded in part by the Russian Foundation for Basic Research and German Research Foundation (DFG) as part of the scientific project no. 20-52-12009. B.M. Shustov is grateful for the Russian Science Foundation for the grant 19-71-20089.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, 119017, Moscow, Russia

    M. D. Sizova, S. V. Vereshchagin, B. M. Shustov & N. V. Chupina

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  1. M. D. Sizova
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  2. S. V. Vereshchagin
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  3. B. M. Shustov
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  4. N. V. Chupina
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Correspondence to M. D. Sizova.

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Translated by M. Chubarova

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Sizova, M.D., Vereshchagin, S.V., Shustov, B.M. et al. Solar System Encounters with Open Star Clusters. Astron. Rep. 64, 711–721 (2020). https://doi.org/10.1134/S106377292009005X

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  • DOI: https://doi.org/10.1134/S106377292009005X

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