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      The orbit and dynamical evolution of the Chelyabinsk object

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          Abstract

          The orbit of the Chelyabinsk object is calculated, applying the least-squares method directly to astrometric positions. The dynamical evolution of this object in the past is studied by integrating equations of motion for particles with orbits from the confidence region. It is found that the majority of the Chelyabinsk clones reach the near-Sun state. 67 percent of these objects have collisions with the Sun for 15 Myr in our numerical simulations. The distribution of minimum solar distances shows that the most probable time for the encounters of the Chelyabinsk object with the Sun lies in the interval from -0.8 Myr to -2 Myr. This is consistent with the estimate of a cosmic ray exposure age of 1.2 Myr (Popova et al 2013). A parent body of the Chelyabinsk object should experience strong tidal and thermal effects at this time. The possible association of the Chelyabinsk object with 86039 (1999 NC43) and 2008 DJ is discussed.

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          Author and article information

          Journal
          05 December 2014
          Article
          10.1111/maps.12382
          1412.1987
          7cad6a20-142f-4522-b83f-2f6869218ac3

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          Meteoritics and Planetary Science, 2014, Volume 49, Nr 12, pp. 2169-2174
          12 pages, 5 figures
          astro-ph.EP

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