(148209) 2000 CR105

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(148209) 2000 CR105
Planet nine 15 etno2 2017.png
2000 CR105 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)
Earliest precovery date 6 February 2000
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)
Physical characteristics
Dimensions 328 km[5]
242 km[6]
0.04 (expected)[5]
Temperature ~ 19 K
23.8 [7]

(148209) 2000 CR105 is a trans-Neptunian object and 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]


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 also[edit]


  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. arXiv:astro-ph/0412030. Bibcode:2004Natur.432..598K. doi:10.1038/nature03136. PMID 15577903.
  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. arXiv:astro-ph/0403358. Bibcode:2004AJ....128.2564M. 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". FindPlanetNine.com.
  16. ^ a b "AstDyS-2, Asteroids - Dynamic Site". Retrieved 2018-04-03. Objects with distance from Sun over 59 AU

External links[edit]