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(148209) 2000 CR105 is a trans-Neptunian object and the tenth-most-distant known object in the Solar System as of 2015[update]. Considered a detached object,[9][10] it orbits the Sun in a highly eccentric orbit every 3,305 years at an average distance of 222 astronomical units (AU).[3]
 2000 CR105 is seen as a smaller orbit center left in red with hypothetical Planet Nine in green | |
| Discovery[1] | |
|---|---|
| Discovered by | Marc W. Buie |
| Discovery date | 6 February 2000 |
| Designations | |
| 2000 CR105 | |
| Orbital characteristics[2][3] | |
| 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) |
Average orbital speed | 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 | |
| 0.04 (expected)[5] | |
| Temperature | ~ 19 K |
| 23.8[8] | |
| 6.3[3] | |
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.[11][12]
- They were pulled from their original positions by a very distant, and as-yet-undiscovered (albeit unlikely), giant planet.[13]
- They were pulled from their original positions by an undiscovered companion star orbiting the Sun such as Nemesis.[13]
- They were captured from another planetary system during a close encounter early in the Sun's history.[11] 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.[11]
(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°.[14] It is one of eleven objects known with a semi-major axis greater than 100 AU and perihelion beyond 42 AU.[15] It may be influenced by Planet Nine.[16]
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