20461 Dioretsa
20461 Dioretsa is a centaur and damocloid on a retrograde, cometary-like orbit from the outer Solar System. It was discovered on 8 June 1999, by members of the LINEAR team at the Lincoln Laboratory Experimental Test Site near Socorro, New Mexico, United States. The highly eccentric unusual object measures approximately in diameter. It was named dioretsa, an anadrome of "asteroid".
Classification and orbit
Dioretsa is a member of the damocloids, with a retrograde orbit and a negative TJupiter of −1.547. It is also a centaur, as its orbit has a semi-major axis in between that of Jupiter Neptune. The Minor Planet Center lists it as a critical object and unusual minor planet due to an orbital eccentricity of more than 0.5.It orbits the Sun at a distance of 2.4–45.4 AU once every 116 years and 10 months. Its orbit has an eccentricity of 0.90 and an inclination of 160° with respect to the ecliptic. Its observation arc begins 12 months prior to its official discovery observation, with a precovery image taken by Spacewatch at Steward Observatory in June 1998., it was last observed in 2000 and its orbit still has an uncertainty of 2.