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90482 Orcus facts for kids

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90482 Orcus
NASA picture of 90482 Orcus
Discovery
Discovered by M. Brown,
C. Trujillo,
D. Rabinowitz
Discovery date February 17, 2004
Designations
2004 DW
Plutino
Orbital characteristics
Epoch November 30, 2008 (JD 2 454 800)
Aphelion 7 188.17 Gm (48.05 AU)
Perihelion 4 535.80 Gm (30.32 AU)
5 862.44 Gm (39.188 AU)
Eccentricity 0.226 18
89 606 d (245.33 yr)
4.68 km/s
164.68°
Inclination 20.593°
268.722°
72.474°
Known satellites 1 (92-432 km)
Physical characteristics
Dimensions 946.3 +74.1−72.3 km (diameter)
Mass ~7.5×1020 kg
Mean density
~1.5 g/cm³ (assumed)
~0.2 m/s²
~0.44 km/s
13.19h
Albedo 19.75 +3.40−2.76 %
Temperature ~45 K
Spectral type
B-V=0.68; V-R=0.37
19.1 (opposition)
2.3


90482 Orcus, originally known by the provisional designation 2004 DW) is a Kuiper belt object (KBO) and could be a dwarf planet. It was found by Michael Brown, Chad Trujillo and David Rabinowitz on February 17, 2004. It was also seen in pictures from November 8, 1951.

Moon

A moon of Orcus was found on 22 February 2007. The orbit of this moon has yet to be found out.

The satellite was found at 0.25 arcsec from Orcus with magnitude difference of 2.7. Assuming an albedo similar to that of the primary, the magnitude suggests a diameter of about 220 km. It is thought to be a smaller KBO that was captured.

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