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首页> 外文期刊>Planetary and space science >The cratering history of asteroid (21) Lutetia
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The cratering history of asteroid (21) Lutetia

机译：小行星的火山口历史（21）Lutetia

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摘要

The European Space Agency's Rosetta spacecraft passed by the main belt asteroid (21) Lutetia on 10th July 2010. With its ～100 km size, Lutetia is one of the largest asteroids ever imaged by a spacecraft. During the flyby, the on-board OSIRIS imaging system acquired spectacular images of Lutetia's northern hemisphere revealing a complex surface scarred by numerous impact craters, reaching the maximum dimension of about 55 km. In this paper, we assess the cratering history of the asteroid. For this purpose, we apply current models describing the formation and evolution of main belt asteroids, that provide the rate and velocity distributions of impactors. These models, coupled with appropriate crater scaling laws, allow us to interpret the observed crater size-frequency distribution (SFD) and constrain the cratering history. Thanks to this approach, we derive the crater retention age of several regions on Lutetia, namely the time lapsed since their formation or global surface reset. We also investigate the influence of various factors - like Lutetia's bulk structure and crater obliteration - on the observed crater SFDs and the estimated surface ages. From our analysis, it emerges that Lutetia underwent a complex collisional evolution, involving major local resurfacing events till recent times. The difference in crater density between the youngest and oldest recognized units implies a difference in age of more than a factor of 10. The youngest unit (Beatica) has an estimated age of tens to hundreds of Myr, while the oldest one (Achaia) formed during a period when the bombardment of asteroids was more intense than the current one, presumably around 3.6 Gyr ago or older.
机译：欧洲航天局的罗塞塔（Rosetta）航天飞机于2010年7月10日经过主带小行星（21）Lutetia。Lutetia的大小约为100公里，是有史以来最大的小行星之一。在飞越过程中，机载OSIRIS成像系统获取了Lutetia北半球的壮观图像，揭示了一个复杂的表面，该表面被众多撞击坑刮伤，最大尺寸约为55公里。在本文中，我们评估了小行星的陨石坑历史。为此，我们应用当前的模型来描述主带小行星的形成和演化，从而提供撞击器的速度和速度分布。这些模型，加上适当的陨石坑定律，使我们能够解释观测到的陨石坑大小-频率分布（SFD），并限制了陨石坑的历史。借助这种方法，我们得出了Lutetia上几个区域的火山口保留年龄，即自其形成或整体表面复位以来经过的时间。我们还研究了各种因素（如Lutetia的块状​​结构和陨石坑闭塞）对观测到的陨石坑SFD和估计的表面年龄的影响。从我们的分析中可以看出，Lutetia经历了复杂的碰撞演化，涉及直到最近的主要局部表面重铺事件。最年轻和最老的公认单位之间的火山口密度差异意味着年龄差异超过10倍。最年轻的单位（Beatica）估计年龄为数十至数百马币，而最老的单位（Achaia）形成了在小行星的轰炸比目前的轰炸更激烈的时期，大概是在3.6吉尔以前或更早。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.87-95|共9页
  • 作者

    S. Marchi; M. Massironi; J.-B. Vincent; A. Morbidelli; S. Mottola; F. Marzari; M. Kueppers; S. Besse; N. Thomas; C. Barbieri; G. Naletto; H. Sierks;

  • 作者单位

    Departement Cassiopee, Universite de Nice - Sophia Antipolis, Observatoire de la Cote d'Azur, CNRS, Nice, France;

    Department of Geosciences, Padova University, Italy;

    Max Planck Institute for Solar System Research, Lindau, Germany;

    Departement Cassiopee, Universite de Nice - Sophia Antipolis, Observatoire de la Cote d'Azur, CNRS, Nice, France;

    Institut fuer Pianetenforschung, DLR-Berlin, Germany;

    Department of Physics, Padova University, Italy;

    ESA-ESAC, Villanueva de la Canada, Madrid, Spain;

    Laboratoire d'Astrophysique de Marseille, France;

    Physikalisches Institut, University of Bern, Switzerland;

    Department of Astronomy, Padova University, Italy;

    Departement Cassiopee, Universite de Nice - Sophia Antipolis, Observatoire de la Cote d'Azur, CNRS, Nice, France;

    Max Planck Institute for Solar System Research, Lindau, Germany;

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  • 正文语种 eng
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  • 关键词

    asteroid (21) lutetia; asteroid cratering; asteroid evolution; main belt asteroids;

    机译：小行星（21）黄体;小行星陨石坑;小行星演化;主带小行星;

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