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Spin pairs in the Koronis asteroid family

机译:Koronis小行星家庭的旋转对

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摘要

Asteroid groups may either form because of collisions or the rotational failure of a parent body. Collisional asteroid families tend to be more spread in proper element domains, while young spin clusters are usually much more compact. Recently, it has been shown that young spin clusters may form at higher rates in extremely young asteroid families (families younger than similar or equal to 3 Myr) than in more evolved groups. Among asteroid families, the Koronis family is a natural laboratory to test this phenomenon. While the family itself is very evolved, with an estimated age of more than 2 Byr, two young sub-families are known to be located among Koronis members: the extremely young family of Karin, with an age of 5.75 +/- 0.05 Myr, and the relatively young sub-family of Koronis(2), with an age of 10 +/- 5 Myr. This fact allows studying the occurrence of young spin clusters in extremely young, young and evolved asteroid populations, all sharing the same physical properties. Using methods based on backward numerical integrations, we identify one possible pair candidate in the Karin family, and retrieved the pair 1741-258640 recently found in other works. No convincing spin pair candidate was found in the Koronis(2) sub-family. This suggests that the occurrence of young spin clusters in families older than similar or equal to 3 Myr may be a rarer event than what previously thought.
机译:小行星组可以是因为父母身体的碰撞或旋转破坏而形成。碰撞小行星家族往往在适当的元素结构域中往往更加蔓延,而幼小的旋转簇通常更紧凑。最近,已经表明,年轻的旋转簇可能在极度年轻的小行星家庭(比类似或等于3 myr的家庭中的家庭更高的速率,而不是更进一步的群体。在小行星家庭中,韩国家族是一种测试这种现象的自然实验室。虽然家庭本身是非常进化的,但估计年龄超过2次比赛,众所周知,两家年轻的子家庭都是位于韩国成员之中:令人古老的卡林家庭,年龄为5.75 +/- 0.05 Myr,和韩文(2)的相对年轻的亚家庭,年龄为10岁+/- 5 myr。这一事实允许研究极度年轻,年轻和发展的小行星种群中的年轻自旋集群的发生,所有人都分享相同的物理性质。使用基于倒退的数字积分的方法,我们识别卡林家族中的一个可能的对候选,并检索在其他作品中找到的一对1741-258640。在Koronis(2)个子家庭中没有令人信服的旋转对候选者。这表明比类似或等于3 Myr的家庭中的幼族簇的发生可能是比以前认为的罕见事件。

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  • 来源
    《Planetary and space science》 |2020年第11期|105083.1-105083.6|共6页
  • 作者单位

    Sao Paulo State Univ UNESP Sch Nat Sci & Engn BR-12516410 Guaratingueta SP Brazil;

    Natl Space Res Inst INPE Div Space Mech & Control CP 515 BR-12227310 Sao Jose Dos Campos SP Brazil;

    Fed Univ Sao Paulo UNIFESP Sci & Technol Inst BR-12247014 Sao Jose Dos Campos SP Brazil;

    Sao Paulo State Univ UNESP Sch Nat Sci & Engn BR-12516410 Guaratingueta SP Brazil;

    Sao Paulo State Univ UNESP Sch Nat Sci & Engn BR-12516410 Guaratingueta SP Brazil;

    Sao Paulo State Univ UNESP Sch Nat Sci & Engn BR-12516410 Guaratingueta SP Brazil;

    Sao Paulo State Univ UNESP Sch Nat Sci & Engn BR-12516410 Guaratingueta SP Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Minor planets; Asteroids; General; Individual; Koronis; Celestial mechanics;

    机译:小星球;小行星;一般;个人;koronis;天体力学;

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