90482 Orcus

Moon 

A moon of Orcus was found on  22 February 2007.

The satellite was found at 0.25 arcsec from Orcus with magnitude difference of 2.7.Distant EKO  The Kuiper Belt Electronic newsletter, March 2007 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.

Other websites
 MPEC 2004-D09 announcing the discovery but attributing it to Raymond J. Bambery, Steven H. Pravdo, Michael D. Hicks, Kenneth J. Lawrence, Daniel MacDonald, Eleanor F. Helin and Robert Thicksten / NEAT
 MPEC 2004-D13 correcting MPEC 2004-D09
 Chad Trujillo's page on 2004 DW 
 First BBC article
 First New Scientist article
 Updated orbital elements from Lowell Observatory 
 AstDys orbital elements
 Orbital simulation from JPL (Java) / Ephemeris

 References 

Category:Kuiper belt objects
Category:Dwarf planets