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Encyclopedia > (65407) 2002 RP120

(65407) 2002 RP120
Discoverer Brian A. Skiff/LONEOS
Discovery Date September 4, 2002
Alternate Designations  
Category Damocloid asteroid,
Scattered disk object
Orbital Elements
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
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 ~51 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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