(148209) 2000 CR105

Infobox Planet | minorplanet = yes | width = 25em | bgcolour = #FFFFC0
name=mp|(148209) 2000 CR|105
discovery=yes
discovery_ref= [http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html]
discoverer=Marc W. Buie
discovered=February 6, 2000
alt_names="none"
mp_category=E-SDO
(detached object)
orbit_ref=cite web |author=Marc W. Buie |date=2006/12/21 |title=Orbit Fit and Astrometric record for 148209 |publisher=SwRI (Space Science Department) |url=http://www.boulder.swri.edu/~buie/kbo/astrom/148209.html |accessdate=2008-07-18 ] cite web |title=JPL Small-Body Database Browser: 148209 (2000 CR105) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000CR105 |accessdate=2008-02-20]
epoch=April 10, 2007 (JD 2454200.5)
semimajor=32927.530 Gm (218.9 AU)
perihelion=6611.023 Gm (44.1 AU)
aphelion=59244.037 Gm (393.8 AU)
eccentricity=0.798
period=1183743.25 d (3240.91 a)
inclination=22.776°
asc_node=128.3°
arg_peri=316.7°
mean_anomaly=4.73°
avg_speed=1.63 km/s
physical_characteristics=yes
dimensions=253 kmcite web |title=List of Known Trans-Neptunian Objects|publisher=Johnston's Archive|url=http://www.johnstonsarchive.net/astro/tnoslist.html|accessdate=2006-12-14]
mass=1.3e|19? kgassume radius of 126.5 km; volume of a sphere * assume the density of Phoebe @ 1.6g/cm³ (though it could be a porous rubble pile), and you get a mass of 1.35e19 kg]
density=1.6? g/cm³
surface_grav=0.0741? m/s²
escape_velocity=0.119? km/s
sidereal_day=? d
axial_tilt=?° | pole_ecliptic_lat=? | pole_ecliptic_lon=?
spectral_type=?
abs_magnitude=6.1
albedo=0.10?
single_temperature=~19 K

mp|(148209) 2000 CR|105, also written as (148209) 2000 CR105, is currently the fourth most distant known object in the solar system after Eris, Sedna, and 2004 XR190. [Though some long-period comets and space probes are further.] Considered a detached object,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.] 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).

mp|2000 CR|105 has a diameter of around 253 km. This small size will probably prevent it from ever qualifying as a dwarf planet.citeweb
url=http://web.gps.caltech.edu/~mbrown/dwarfplanets/
title=The Dwarf Planets
author=Michael E. Brown
publisher=California Institute of Technology, Department of Geological Sciences
accessdate=2008-02-19]

mp|2000 CR|105 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.cite journal
journal=Nature
volume=432
pages=598–602
month=2 December
year=2004
title="Stellar encounters as the origin of distant Solar System objects in highly eccentric orbits"
first=Scott J.
last=Kenyon
coauthors=Benjamin C. Bromley
url=http://arxiv.org/abs/astro-ph/0412030v1
doi=10.1038/nature03136
format=abstract ] cite journal
journal=The Astronomical Journal
volume=128
pages=2564–2576
year=2004
title="Scenarios for the Origin of the Orbits of the Trans-Neptunian Objects 2000 CR105 and 2003 VB12 (Sedna)"
first=Alessandro
last=Morbidelli
coauthors=Harold F. Levison
url=http://www.journals.uchicago.edu/doi/pdf/10.1086/424617
doi=10.1086/424617 [http://www.arxiv.org/abs/astro-ph/0403358 (Original Preprint)] ]
* They were pulled from their original positions by a very distant and as-yet-undiscovered (albeit unlikely) giant planet.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)]
* They were pulled from their original positions by an as-yet-undiscovered companion star orbiting the Sun. (See: Nemesis (star))
* They were captured from another planetary system during a close encounter early in the Sun's history. 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. mp|2000 CR|105 is 2–3 times more likely to be a captured planetary object than Sedna.

ee also

*Sedna
*Planet X
*mpl|2004 VN|112
*mpl|(87269) 2000 OO|67
*Cleared the neighbourhood

External links

* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000CR105;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2000CR105 Ephemeris]
* [http://www.astro.ubc.ca/people/gladman/cr105.html Orbit Determination of mp|2000 CR|105]
* [http://www.heavens-above.com/solar-escape.asp Spacecraft escaping the Solar System] (Heavens-Above)
* World Book: [http://www.worldbook.com/features/outerplanets/html/pluto_worlds.html Worlds Beyond Pluto]

References