(148209) 2000 CR105


Object::title    Objects::their    Sedna::solar    BrownDP::albedo    Group::planet    System::kenyon


(148209) 2000 CR105, also written as (148209) 2000 CR105, is roughly the seventh-most-distant known object in the Solar System.<ref>(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.</ref> Considered a detached object,<ref name="Swiss">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.</ref><ref name="LykDyn">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. doi:10.1016/j.icarus.2007.01.001.</ref> it orbits the Sun in a highly eccentric orbit every 3345 years at an average distance of 223 astronomical units (AU).<ref name=jpldata />

Mike Brown's website lists it as a possible dwarf planet with a diameter of {{safesubst:#invoke:convert|convert}} based on an assumed albedo of 0.04.<ref name=BrownDP /> The albedo is expected to be low because the object has a blue (neutral) color.<ref name=BrownDP /> However, if the albedo is higher, the object could easily be half that size.

(148209) 2000 CR105 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.<ref name=Kenyon>

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  • They were pulled from their original positions by a very distant, and as-yet-undiscovered (albeit unlikely), giant planet.<ref name=Matese>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)</ref>
  • They were pulled from their original positions by an undiscovered companion star orbiting the Sun.<ref name=Matese />
  • They were captured from another planetary system during a close encounter early in the Sun's history.<ref name=Kenyon /> 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. (148209) 2000 CR105 is estimated to be 2–3 times more likely to be a captured planetary object than Sedna.<ref name=Kenyon />

(148209) 2000 CR105 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°.<ref name="jpl-search">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

(148209) 2000 CR105 sections
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