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Discovery[1] and designation
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| Discovered by | Marc W. Buie |
| Discovery date | February 6, 2000 |
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Designations
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| Alternate name2 | none |
| Minor planet category |
E-SDO (detached object)1 |
| Epoch April 10, 2007 (JD 2454200.5) | |
| Aphelion | 59244.037 Gm (393.8 AU) |
| Perihelion | 6611.023 Gm (44.1 AU) |
| Semi-major axis | 32927.530 Gm (218.9 AU) |
| Eccentricity | 0.798 |
| Orbital period | 1183743.25 d (3240.91 a) |
| Average orbital speed | 1.63 km/s |
| Mean anomaly | 4.73° |
| Inclination | 22.776° |
| Longitude of ascending node | 128.3° |
| Argument of perihelion | 316.7° |
| Dimensions | 253 km4 |
| Mass | 1.3×1019? kg5 |
| Mean density | 1.6? g/cm³ |
| Equatorial surface gravity | 0.0741? m/s² |
| Equatorial escape velocity | 0.119? km/s |
| Sidereal rotation period |
? d |
| Axial tilt | ?° |
| Pole ecliptic latitude | ? |
| Pole ecliptic longitude | ? |
| Geometric albedo | 0.10? |
| Temperature | ~19 K |
| Spectral type | ? |
| Absolute magnitude (H) | 6.13 |
(148209) 2000 CR105, also written as (148209) 2000 CR105, is currently the fourth most distant known object in the solar system after Eris, Sedna, and 2004 XR190.6 Considered a detached object,78 it circles the sun in a highly eccentric orbit every 3240 years at an average distance of 219 astronomical units (1 AU being about equal to the mean Earth-Sun distance: roughly 150,000,000 Km).
2000 CR105 has a diameter of around 253 km. This small size will probably prevent it from ever qualifying as a dwarf planet.9
2000 CR105 and Sedna differ from other scattered disc objects in that at their perihelion distances, they are not within the gravitational influence of the planet Neptune. 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.1011
- 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 as-yet-undiscovered companion star orbiting the Sun. (See: Nemesis (star))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.10 2000 CR105 is 2–3 times more likely to be a captured planetary object than Sedna.
See also
External links
- Orbital simulation from JPL (Java) / Ephemeris
- Orbit Determination of 2000 CR105
- Spacecraft escaping the Solar System (Heavens-Above)
- World Book: Worlds Beyond Pluto
References
- ^ a b Marc W. Buie (2006/12/21). "Orbit Fit and Astrometric record for 148209". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/148209.html. Retrieved on 2008-07-18.
- ^ Minor Planet Designations
- ^ a b "JPL Small-Body Database Browser: 148209 (2000 CR105)". http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000CR105. Retrieved on 2008-02-20.
- ^ "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved on 2006-12-14.
- ^ Assuming a radius of 126.5 km, that the body is spherical, and that it has the same density as that of Phoebe (1.6 g/cm³; although it could be a porous rubble pile), you get a mass of 1.35 × 1019 kg.
- ^ Although some long-period comets and space probes are further.
- ^ 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 3540719571.
- ^ 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.
- ^ Michael E. Brown. "The Dwarf Planets". California Institute of Technology, Department of Geological Sciences. http://web.gps.caltech.edu/~mbrown/dwarfplanets/. Retrieved on 2008-02-19.
- ^ a b c Kenyon, Scott J.; Benjamin C. Bromley (2 December 2004). "Stellar encounters as the origin of distant Solar System objects in highly eccentric orbits" (abstract). Nature 432: 598–602. doi:. http://arxiv.org/abs/astro-ph/0412030v1.
- ^ 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': 2564–2576. doi:. http://www.journals.uchicago.edu/doi/pdf/10.1086/424617. (Original Preprint)
- ^ 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)
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