(65407) 2002 RP120

From Academic Kids

(65407) 2002 RP120
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer Brian A. Skiff/LONEOS
Discovery date September 4 2002
Alternate
designations
  B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Damocloid asteroid,
Scattered disk object
Orbital elements C (http://asteroid.lowell.edu/)
Epoch July 14, 2004 (JD 2453200.5)
Eccentricity (e) 0.956
Semi-major axis (a) 8368.303 Gm (55.939 AU)
Perihelion (q) 369.948 Gm (2.473 AU)
Aphelion (Q) 16366.658 Gm (109.404 AU)
Orbital period (P) 152,815.148 d (418.39 a)
Mean orbital speed 3.98 km/s
Inclination (i) 119.112
Longitude of the
ascending node
(Ω)
39.194
Argument of
perihelion
(ω)
358.002
Mean anomaly (M) 1.523
Physical characteristics
Dimensions 10-20 km
Mass 3.11015 kg
Density 2 ? g/cm
Surface gravity 0.0040 m/s
Escape velocity 0.0076 km/s
Rotation period 8.3? d 1 (http://obswww.unige.ch/~behrend/page5cou.html)
Spectral class  ?
Absolute magnitude 12.3
Albedo 0.1 ?
Mean surface
temperature
~37 K

(65407) 2002 RP120 holds the dubious distinction of being the most eccentric of the numbered asteroids (as of July 2004). It is also a member of the very exclusive group of retrograde asteroids, which has only two numbered members (the other one is 20461 Dioretsa). Its classification is uncertain, as it is at once a Damocloid (a highly eccentric, highly inclined object likely to be an extinct comet) and a scattered disk object (a Trans-Neptunian object with a very eccentric orbit, likely ejected from the ecliptic by Neptune).

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