Orcus

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Orcus
Orcus is a Kuiper belt object with a large moon, Vanth.Orcus is a plutino, locked in a 2:3 resonance with Neptune, making two revolutions around the Sun to every three of Neptune's. This is much like Pluto, except that it is constrained to always be in the opposite phase of its orbit from Pluto: Orcus is at aphelion when Pluto is at perihelion and vice versa. Because of these similarities and contrasts, along with its large moon Vanth that recalls Pluto's large moon Charon, Orcus has been regarded as the anti-Pluto. The presence of crystalline water ice, and possibly ammonia ice may indicate that a renewal mechanism was active in the past on the surface of Orcus. 90482 Orcus - Wikipedia, the free encyclopedia
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Additional Information

Short Description Orcus is a Kuiper belt object with a large moon, Vanth.Orcus is a plutino, locked in a 2:3 resonance with Neptune, making two revolutions around the Sun to every three of Neptune's. This is much like Pluto, except that it is constrained to always be in the opposite phase of its orbit from Pluto: Orcus is at aphelion when Pluto is at perihelion and vice versa. Because of these similarities and contrasts, along with its large moon Vanth that recalls Pluto's large moon Charon, Orcus has been regarded as the anti-Pluto. The presence of crystalline water ice, and possibly ammonia ice may indicate that a renewal mechanism was active in the past on the surface of Orcus. 90482 Orcus - Wikipedia, the free encyclopedia
Discovered by M. Brown, C. Trujillo, D. Rabinowitz
Discovery date 17 February 2004
Type TNO
AddInfo Plutino
Satellite of Sun
Minor planet number 90482
Orbit Prograde
Rotation Direct
Geological activity In the past
Apoapsis 10 7 191 600 000 km
Periapsis 10 4 617 500 000 km
Semi-major axis 10 5 904 500 000 km
Distance from Sun 02 39.469 au
Eccentricity 0.21799
Orbital period 247.97 year | 90571.28 days
Orbital speed  4.684 km/s
Mean anomaly 174.67°
Inclination to the equator 020.564°
Longitude of the ascending node 268.570°
Argument of periapsis 072.977°
Diameter/Size 03 917 ± 25 km
Mass 1020×6.41 kg
Density 01 1.53 g/cm3
Surface gravity  0.18 m/s2
Escape velocity  410 m/s
Rotation period 13.188 hours
Albedo geometric 0.231
Temperature mean 02 44 K
Apparent magnitude 19.1
Absolute magnitude 2.31
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