20461 Dioretsa

20461 Dioretsa: 20461 Dioretsa

Discovery and designation

Discovered by Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro^[1]

Discovery date 8 June 1999

Designations

MPC designation 20461

Alternate name(s) 1999 LD₃₁

Minor planet
category centaur^[1], damocloid

Orbital characteristics^[1]

Epoch 2455800.5 (2011 Aug 27.0)

Aphelion 45.296 AU

Perihelion 2.363606 AU

Semi-major axis 23.8297 AU

Eccentricity 0.900813

Orbital period 42489 days (116.329 y)

Mean anomaly 36.425°

Inclination 160.41900° (retrograde)

Longitude of ascending node 297.41955°

Argument of perihelion 102.5329°

Physical characteristics

Absolute magnitude (H) 13.8^[1]

Dioretsa (1999 LD₃₁) (pronounced /daɪ.əˈrɛtsə/ dy-ə-ret-sə) is a centaur^[1] 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 notable asteroids.

Dioretsa's orbit is otherwise similar to a comet's; it has a perihelion of 2.4 AU and an aphelion of 45.3 AU. This has led to speculation that Dioretsa was originally an object from the Oort cloud.

References

^ ^a ^b ^c ^d ^e JPL Small-Body Database Browser

v · d · eMinor planets navigator

20460 Robwhiteley•20461 Dioretsa• (20462) 1999 LZ31

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**20461 Dioretsa**
Discovery and designation
Discovered by	Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro^[1]
Discovery date	8 June 1999
Designations
MPC designation	20461
Alternate name(s)	1999 LD₃₁
Minor planet category	centaur^[1], damocloid
Orbital characteristics^[1]
Epoch 2455800.5 (2011 Aug 27.0)
Aphelion	45.296 AU
Perihelion	2.363606 AU
Semi-major axis	23.8297 AU
Eccentricity	0.900813
Orbital period	42489 days (116.329 y)
Mean anomaly	36.425°
Inclination	160.41900° (retrograde)
Longitude of ascending node	297.41955°
Argument of perihelion	102.5329°
Physical characteristics
Absolute magnitude (H)	13.8^[1]

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20461 Dioretsa

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