90482 Orcus facts for kids
|Discovered by||M. Brown,
|Discovery date||February 17, 2004|
|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)|
|89 606 d (245.33 yr)|
Average orbital speed
|Known satellites||1 (92-432 km)|
|Dimensions||946.3 +74.1−72.3 km (diameter)|
|~1.5 g/cm³ (assumed)|
|Albedo||19.75 +3.40−2.76 %|
90482 Orcus, originally known by the provisional designation 2004 DW, is a Kuiper belt object (KBO). It is also 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. Like Pluto it is in orbital resonance with Neptune but it stays on the opposite side of the Sun from Pluto.
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.
Images for kids
90482 Orcus Facts for Kids. Kiddle Encyclopedia.