(148209) 2000 CR105

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(148209) 2000 CR105
Discovery[1] and designation
Discovered by Marc W. Buie
Discovery date February 6, 2000
Designations
Alternative names none
Minor planet category E-SDO
(detached object)[1]
Orbital characteristics[1][2]
Epoch 2011-Aug-27 (JD 2455800.5)
Aphelion 403.3 AU (Q)
(60.33 Tm)
Perihelion 44.03 AU (q)
(6.586 Tm)
Semi-major axis 223.7 AU (a)
(33.46 Tm)
Eccentricity 0.80316
Orbital period 3,345.87 yr (1,222,078 d)
Average orbital speed 1.63 km/s
Mean anomaly 4.997°
Inclination 22.765°
Longitude of ascending node 128.2° (Ω)
Argument of perihelion 316.5° (ω)
Physical characteristics
Dimensions 328 km[3]
242 km[4]
Geometric albedo 0.04 (expected)[3]
Temperature ~19 K
Spectral type Blue[3]
Apparent magnitude 23.8[5]
Absolute magnitude (H) 6.3[2]

(148209) 2000 CR105, also written as (148209) 2000 CR105, is about the seventh-most-distant known object in the Solar System.[6] Considered a detached object,[7][8] it orbits the Sun in a highly eccentric orbit every 3345 years at an average distance of 223 astronomical units (AU).[2]

Mike Brown's website lists it as a possible dwarf planet with a diameter of 328 km based on an assumed albedo of 0.04.[3] The albedo is expected to be low because the object has a blue (neutral) color.[3] But if the albedo is higher the object could easily be half that size.

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 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.[9][10]
  • They were pulled from their original positions by a very distant and as-yet-undiscovered (albeit unlikely) giant planet.[11]
  • They were pulled from their original positions by an undiscovered companion star orbiting the Sun.[11]
  • They were captured from another planetary system during a close encounter early in the Sun's history.[9] 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. 2000 CR105 is estimated to be 2–3 times more likely to be a captured planetary object than Sedna.[9]

2000 CR105 is the first object discovered in the Solar System to have a semi-major axis > 150 AU, a perihelion beyond Neptune, and an argument of perihelion of 340 ± 55°.[12]

See also[edit]

References[edit]

  1. ^ a b Marc W. Buie (2006-12-21). "Orbit Fit and Astrometric record for 148209". SwRI (Space Science Department). Retrieved 2008-07-18. 
  2. ^ a b c "JPL Small-Body Database Browser: 148209 (2000 CR105)". Retrieved 2008-02-20. 
  3. ^ 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. Retrieved 2014-02-16. 
  4. ^ "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2014-04-05. 
  5. ^ "AstDys (148209) 2000CR105 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-04-18. Retrieved 2009-03-16. 
  6. ^ (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.
  7. ^ 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.
  8. ^ 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.
  9. ^ 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. 
  10. ^ 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. 
  11. ^ 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)
  12. ^ "JPL Small-Body Database Search Engine: a > 150 (AU) and q > 30 (AU)". JPL Solar System Dynamics. Retrieved 2014-04-09. 

External links[edit]