90482 Orcus facts for kids

Kids Encyclopedia Facts
90482 Orcus
NASA picture of 90482 Orcus
Discovery
Discovered by M. Brown,
C. Trujillo,
D. Rabinowitz
Discovery date February 17, 2004
Names
Other names 2004 DW
Category Plutino
Orbit
Reference date November 30, 2008 (JD 2 454 800)
Longest distance from the Sun 7 188.17 Gm (48.05 AU)
Shortest distance from the Sun 4 535.80 Gm (30.32 AU)
Longest distance from the center of its orbital path
("semi-major axis")
5 862.44 Gm (39.188 AU)
How long it takes to complete an orbit 89 606 d (245.33 yr)
Average speed 4.68 km/s
Mean anomaly 164.68°
Angle above the reference plane
("inclination")
20.593°
Natural things which orbit it 1 (92-432 km)
Size and other qualities
Measurements 946.3 +74.1−72.3 km (diameter)
Mass ~7.5×1020 kg
Average density ~1.5 g/cm³ (assumed)
Surface gravity ~0.2 m/s²
Escape velocity ~0.44 km/s
Rotation period 13.19h
How much light it reflects 19.75 +3.40−2.76 %
Avg. surface temp. ~45 K
Spectral type B-V=0.68; V-R=0.37
Seeming brightness
("apparent magnitude")
19.1 (opposition)
True brightness
("absolute magnitude")
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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