Its surface is one of the reddest in the Solar System. This may be the first detection of a Hills cloud object, depending on the definition used. The area of the Hills cloud is defined as any objects with orbits measuring between 1,500 and 10,000 AU. Sedna is, however, much closer than the supposed distance of the Hills cloud. The planetoid discovered at a distance of about from the Sun, travels in an elliptical orbit of 11,400 years with a perihelion point of only 76 AU from the Sun during its closest approach (the next to occur in 2076), and travels out to 936 AU at its farthest point. However, Sedna is not considered a Kuiper belt object, because its orbit does not bring it into the region of the Kuiper belt at 50 AU. Sedna is a "detached object", and thus is not in a resonance with Neptune. Trans-Neptunian object was announced on 26 March 2014 and has a similar orbit to Sedna with a perihelion point significantly detached from Neptune. Its orbit lies between 80 and 400 AU from the Sun. Footnotes References Further reading External links Hypothetical trans-Neptunian objects Minor planets Trans-Neptunian region Astronomical hypotheses Comets Circumstellar disks