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, also written as (148209) 2000 CR105, is roughly the seventh-most-distant known object in the Solar System.〔(Not counting long-period comets and space probes), Eris, Sedna, 2007 OR10, 2006 QH181, 2003 QX113, and 2004 XR190 are all further from the Sun.〕 Considered a detached object,〔Jewitt, David, Morbidelli, Alessandro, & Rauer, Heike. (2007). ''Trans-Neptunian Objects and Comets: Saas-Fee Advanced Course 35. Swiss Society for Astrophysics and Astronomy''. Berlin: Springer. ISBN 3-540-71957-1.〕〔Lykawka, Patryk Sofia & Mukai, Tadashi. (2007). Dynamical classification of trans-neptunian objects: Probing their origin, evolution, and interrelation. ''Icarus'' Volume 189, Issue 1, July , Pages 213–232. .〕 it orbits the Sun in a highly eccentric orbit every 3345 years at an average distance of 223 astronomical units (AU).〔 Mike Brown's website lists it as a possible dwarf planet with a diameter of based on an assumed albedo of 0.04.〔 The albedo is expected to be low because the object has a blue (neutral) color.〔 However, if the albedo is higher, the object could easily be half that size. and Sedna differ from scattered-disc objects in that they are not within the gravitational influence of the planet Neptune even at their perihelion distances (closest approaches to the Sun). It is something of a mystery as to how these objects came to be in their current, far-flung orbits. Several hypotheses have been put forward: * They were pulled from their original positions by a passing star.〔 〕〔 〕 * They were pulled from their original positions by a very distant, and as-yet-undiscovered (albeit unlikely), giant planet.〔John J. Matese, Daniel P. Whitmire, and Jack J. Lissauer, "A Widebinary Solar Companion as a Possible Origin of Sedna-like Objects", ''Earth, Moon, and Planets'', 97:459 (2005)〕 * They were pulled from their original positions by an undiscovered companion star orbiting the Sun.〔 * They were captured from another planetary system during a close encounter early in the Sun's history.〔 According to Kenyon and Bromley, there is a 15% probability that a star like the Sun had an early close encounter and a 1% probability that outer planetary exchanges would have happened. is estimated to be 2–3 times more likely to be a captured planetary object than Sedna.〔 is the first object discovered in the Solar System to have a semi-major axis exceeding 150 AU, a perihelion beyond Neptune, and an argument of perihelion of 340 ± 55°.〔(【引用サイトリンク】publisher=JPL Solar System Dynamics )〕 == See also == * * * Clearing the neighbourhood * Planets beyond Neptune * List of Solar System objects most distant from the Sun in 2015 *List of Solar System objects by greatest aphelion 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「(148209) 2000 CR105」の詳細全文を読む スポンサード リンク
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