| 翻訳と辞書 |
2009 BD
is a very small asteroid that is a Near-Earth object (NEO), and an Earth co-orbital.
==Orbit==
During the 2011 opposition, the last opposition of that was observed, approached on June 2, 2011 within 0.00231 AU (346,000 km) of the Earth, which is less than 1 lunar distance. For comparison, the distance to the Moon is about 0.0026 AU (384,400 km).
With an orbital period of 369.99 days, is in a near 1:1 orbital resonance with Earth, and also has about the same orbit around the Sun as Earth. Other resonant near-Earth objects in addition to include (the first to be discovered), , , , , , , and (an Earth trojan).
The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 6.039.〔 The orbit has a small inclination of about 0.4 degrees.
JPL〔 and MPC〔 give different parameters for the orbit of , affecting whether the orbit type should be considered an Apollo asteroid or an Amor asteroid. JPL includes non-gravitational acceleration parameters in the orbital solution.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「2009 BD」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|