An object in a high-eccentricity orbit close to the ecliptic plane beyond Neptune; also known as a scattered Kuiper Belt object (SKBO). SDOs have perihelia close to Neptune's orbit but aphelia extending out to 100AU or more. The first SDO to be discovered was 1996 TL66, now numbered (15874), which has a perihelion of 35.0AU, aphelion 133.5AU, eccentricity 0.584, inclination 24°.0, and a period of 773 years. Such objects may have escaped from the Kuiper Belt or have been planetesimals scattered from their point of origin between Uranus and Neptune. The dwarf planet Eris is an SDO.
Subjects: Astronomy and Astrophysics.