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(148209) 2000 CR105 is the tenth-most-distant known object in the Solar System as of 2015. Considered a detached object,[8][9] it orbits the Sun in a highly eccentric orbit every 3305 years at an average distance of 222 astronomical units (AU).[4]

(148209) 2000 CR105
Planet nine 15 etno2 2017.png
2002 GB32 is seen as a smaller orbit center left in red with hypothetical Planet Nine in green
Discovered by Marc W. Buie
Discovery date 6 February 2000
2000 CR105
(detached object)[2]
Orbital characteristics[2][4]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 2
Observation arc 5547 days (15.19 yr)
Aphelion 411.62 AU (61.577 Tm) (Q)
Perihelion 44.286 AU (6.6251 Tm) (q)
227.95 AU (34.101 Tm) (a)
Eccentricity 0.80572 (e)
3441.69 yr (1257076 d)
3305 yr (barycentric)[3]
1.63 km/s
5.28267° (M)
0° 0m 1.031s / day (n)
Inclination 22.71773° (i)
128.24627° (Ω)
317.219° (ω)
Earth MOID 43.3369 AU (6.48311 Tm)
Jupiter MOID 39.3452 AU (5.88596 Tm)
Jupiter Tisserand parameter 7.255
Physical characteristics
Dimensions 328 km[5]
242 km[6]
0.04 (expected)[5]
Temperature ~ 19 K
23.8 [7]

Mike Brown's website lists it as a possible dwarf planet with a diameter of 328 kilometres (204 mi) based on an assumed albedo of 0.04.[5] The albedo is expected to be low because the object has a blue (neutral) color.[5] 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.[10][11]
  • They were pulled from their original positions by a very distant, and as-yet-undiscovered (albeit unlikely), giant planet.[12]
  • They were pulled from their original positions by an undiscovered companion star orbiting the Sun.[12]
  • They were captured from another planetary system during a close encounter early in the Sun's history.[10] 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.[10]

(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°.[13] It is one of eleven objects known with a semi-major axis greater than 100 AU and perihelion beyond 42 AU.[14] It may be influenced by Planet Nine.[15]

See alsoEdit


  1. ^ [1]
  2. ^ a b Marc W. Buie (2006-12-21). "Orbit Fit and Astrometric record for 148209". SwRI (Space Science Department). Retrieved 2008-07-18. 
  3. ^ Horizons output. "Barycentric Osculating Orbital Elements for 2000 CR105". Retrieved 2016-01-25.  (Ephemeris Type:Elements and Center:@0)
  4. ^ a b c "JPL Small-Body Database Browser: 148209 (2000 CR105)". Retrieved 11 April 2016. 
  5. ^ a b c d e Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Archived from the original on 2011-10-18. Retrieved 2014-02-16. 
  6. ^ "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2014-04-05. 
  7. ^ "AstDys (148209) 2000CR105 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-04-18. Retrieved 2009-03-16. 
  8. ^ 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.
  9. ^ 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.
  10. ^ a b c Kenyon, Scott J.; Benjamin C. Bromley (2004). "Stellar encounters as the origin of distant Solar System objects in highly eccentric orbits". Nature. 432 (7017): 598–602. Bibcode:2004Natur.432..598K. PMID 15577903. arXiv:astro-ph/0412030 . doi:10.1038/nature03136. 
  11. ^ Morbidelli, Alessandro; Harold F. Levison (2004). "Scenarios for the Origin of the Orbits of the Trans-Neptunian Objects 2000 CR105 and 2003 VB12 (Sedna)". The Astronomical Journal. 128 (5): 2564–2576. Bibcode:2004AJ....128.2564M. arXiv:astro-ph/0403358 . doi:10.1086/424617. 
  12. ^ a b 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)
  13. ^ "JPL Small-Body Database Search Engine: a > 150 (AU) and q > 30 (AU)". JPL Solar System Dynamics. Retrieved 2014-04-09. 
  14. ^ "MPC list of a>100 and q>42". IAU Minor Planet Center. Retrieved 2017-07-24. 
  15. ^ Brown, Mike (2016-02-12). "Why I believe in Planet Nine.". 
  16. ^ a b "AstDyS-2, Asteroids - Dynamic Site". 2016-02-26. Retrieved 2017-02-04. Objects with distance from Sun over 59 AU 

External linksEdit