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90482 Orcus

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90482 Orcus
Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer M. Brown,
C. Trujillo,
D. Rabinowitz
Discovery date February 17, 2004
Alternate
designations
2004 DW B (http://cfa-www.harvard.edu/iau/MPDes.html)
Category Plutino
Orbital elements C (http://asteroid.lowell.edu/)
Epoch October 22, 2004 (JD 2453300.5)
Eccentricity (e) 0.218
Semi-major axis (a) 5903.997 Gm (39.466 AU)
Perihelion (q) 4616.704 Gm (30.861 AU)
Aphelion (Q) 7191.291 Gm (48.071 AU)
Orbital period (P) 90558.570 d (247.94 a)
Mean orbital speed 4.68 km/s
Inclination (i) 20.559
Longitude of the
ascending node
(Ω)
268.556
Argument of
perihelion
(ω)
73.231
Mean anomaly (M) 158.056
Physical characteristics
Dimensions 840 - 1880 km
Mass 6.2 - 701020 kg
Density 2.0? g/cm
Surface gravity 0.2348 - 0.5254 m/s
Escape velocity 0.4441 - 0.9939 km/s
Rotation period  ? d
Spectral class  ?
Absolute magnitude 2.3
Albedo 0.09
Mean surface
temperature
~45 K

90482 Orcus is a Kuiper Belt object (KBO) that was discovered by Michael (Mike) E. Brown of Caltech, Chadwick (Chad) A. Trujillo of the Gemini Observatory, and David L. Rabinowitz of Yale University. The image of this object was first acquired on February 17, 2004.

Size and magnitude

The apparent magnitude of the object is 18.5, which is the same brightness as 50000 Quaoar. The orbit indicates that the object is a Plutino. Therefore, the object is probably larger than Quaoar, since it is farther from the Sun. Using an assumed albedo of 0.09, Trujillo estimates its diameter to be approximately 1600 km, which makes Orcus potentially the second-largest KBO, after Pluto. (The recently discovered 90377 Sedna, lying beyond the Kuiper Belt, may be the second-largest TNO).

Name

Since it shares a similar size and orbit to that of Pluto, it too must be named after a deity of the underworld. In accordance with IAU rules, the discoverers' suggested name of Orcus was approved and published November 22, 2004. Orcus is both another name for the Greek deity Hades and a separate god of the dead in Roman mythology.

External links and sources


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The minor planets
Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans
Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper belt | Oort cloud
(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.)
bg:90482 Оркус

cs:Orcus (planetka) da:2004 DW de:Orcus (Asteroid) fr:90482 Orcus it:90482 Orcus nl:Orcus (planetode) pt:Orcus sk:90482 Orcus

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