Английская Википедия:20461 Dioretsa
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet
20461 Dioretsa Шаблон:IPAc-en 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.[1] The highly eccentric unusual object measures approximately Шаблон:Convert in diameter.[2][3] It was named Dioretsa, the word "asteroid" spelled backwards.[1]
Classification and orbit
Dioretsa is a member of the damocloids,[2] 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 (5.5 AU) Neptune (30.1 AU).[4] The Minor Planet Center lists it as a critical object and (other) unusual minor planet due to an orbital eccentricity of more than 0.5.[5]
It orbits the Sun at a distance of 2.4–45.4 AU once every 116 years and 10 months (42,686 days; semi-major axis of 23.9 AU). Its orbit has an eccentricity of 0.90 and an inclination of 160° with respect to the ecliptic.[4] Its observation arc begins 12 months prior to its official discovery observation, with a precovery taken by Spacewatch at Steward Observatory in June 1998.[1] Шаблон:As of, it was last observed in 2000 and its orbit still has an uncertainty of 2.[4]
Retrograde orbit
An inclination of greater than 90° means that a body moves in a retrograde orbit. DioretsaШаблон:'s orbit is otherwise similar to that of a comet. This has led to speculation that Dioretsa was originally an object from the Oort cloud.Шаблон:Citation needed
Naming
The minor planet's name "Dioretsa" is the word "asteroid" spelled backwards, and is the first numbered of currently 136 known (see Data Base Search of the Minor Planet Center) minor planets with a retrograde motion in the Solar System.[6] The approved naming citation was published by the Minor Planet Center on 1 May 2003 (Шаблон:Small).[7]
Physical characteristics
According to observations made with the 10-meter Keck Telescope, Dioretsa measures 14 kilometers in diameter and its surface has a low albedo of 0.03.[3] It has an absolute magnitude of 13.8.[4] As of 2018, DioretsaШаблон:'s spectral type as well as its rotation period and shape remain unknown.[4][8]
References
External links
- 20461 Dioretsa, Small Bodies Data Ferret
- Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
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- Английская Википедия
- Centaurs (small Solar System bodies)
- Damocloids
- Unusual minor planets
- Discoveries by LINEAR
- Named minor planets
- Astronomical objects discovered in 1999
- Minor planets with a retrograde orbit
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