|Discovery and designation|
|Discovered by||Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro|
|Discovery date||8 June 1999|
|Epoch 2457000.5 (2014 Dec 09.0)|
|115.94 yr (42,346 days)|
Dioretsa (1999 LD31) is a centaur discovered in 1999 notable for its unusual orbit, which is highly eccentric and retrograde. Its name is the word 'asteroid' spelled backwards to reflect this fact. It is one of twenty or so known minor planets in the Solar System that have a retrograde orbit—see the List of exceptional asteroids.
Dioretsa's orbit is otherwise similar to that of a comet. It has a perihelion of 2.4 AU and an aphelion of 45.2 AU. This has led to speculation that Dioretsa was originally an object from the Oort cloud.
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