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  • 标题:Short arc orbit determination and imminent impactors in the Gaia era
  • 本地全文:下载
  • 作者:F. Spoto ; A. Del Vigna ; A. Milani
  • 期刊名称:Astronomy & Astrophysics
  • 印刷版ISSN:0004-6361
  • 电子版ISSN:1432-0746
  • 出版年度:2018
  • 卷号:614
  • DOI:10.1051/0004-6361/201732104
  • 语种:English
  • 出版社:EDP Sciences
  • 摘要:Short-arc orbit determination is crucial when an asteroid is first discovered. In these cases usually the observations are so few that the differential correction procedure may not converge. We developed an initial orbit computation method, based on systematic ranging, which is an orbit determination technique that systematically explores a raster in the topocentric range and range-rate space region inside the admissible region. We obtained a fully rigorous computation of the probability for the asteroid that could impact the Earth within a few days from the discovery without any a priori assumption. We tested our method on the two past impactors, 2008 TC3and 2014 AA, on some very well known cases, and on two particular objects observed by the European Space AgencyGaiamission.
  • 关键词:Key wordsenminor planets, asteroids: generalcatalogsastrometrycelestial mechanicssurveys
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