Английская Википедия:4959 Niinoama
Шаблон:Use dmy dates Шаблон:Infobox planet
4959 Niinoama (prov. designation: Шаблон:Mp) is a dark background asteroid from the outer regions of the asteroid belt. It was discovered by Japanese astronomers Akira Natori and Takeshi Urata at JCPM Yakiimo Station on 15 August 1991.[1] The presumed carbonaceous C-type asteroid has a rotation period of 4.7 hours and measures approximately Шаблон:Convert in diameter. It was named after Taira no Tokiko (1126–1185) of the Imperial House of Japan during the Heian period.
Orbit and classification
Niinoama is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. It orbits the Sun in the outer main-belt at a distance of 3.1–3.2 AU once every 5 years and 7 months (2,044 days). Its orbit has an eccentricity of 0.01 and an inclination of 9° with respect to the ecliptic.[2] A first precovery was taken at Palomar Observatory in May 1950, extending the body's observation arc by more than 41 years prior to its official discovery observation at Yakiimo.[1]
Naming
This minor planet was named after Taira no Tokiko (1126–1185), second wife of military leader Taira no Kiyomori and grandmother of Emperor Antoku after whom Шаблон:MoMP is named. According to the Tale of the Heike, she drowned herself during the Battle of Dan-no-ura together with the boy-Emperor Antoku in her arms.[3][4] The Шаблон:MoMP was published by the Minor Planet Center on 10 November 1992 (Шаблон:Small).[5]
Physical characteristics
Niinoama is an assumed C-type asteroid.[6]
Photometry
Photometric observations of Niinoama collected during 2008 show a rotation period of Шаблон:Val hours with a brightness variation of 0.32 ± 0.04 magnitude (Шаблон:Small),[7] superseding an early measurement that gave Шаблон:Val hours (Шаблон:Small).[8]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Niinoama measures between 26.50 and 42.51 kilometers in diameter and its surface has an albedo of 0.079.[9][10][11][12] The Collaborative Asteroid Lightcurve Link adopts a diameter of 27.96 kilometers from IRAS, and derives an albedo of 0.1082 based on an absolute magnitude of 10.8.[6]
References
External links
- Lightcurve Database Query (LCDB), at www.minorplanet.info
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Here is a shot of asteroid Niinoama, 2.2au from Earth on 17JAN2005 from the SDSS site - Fermats Brother
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
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- Английская Википедия
- Background asteroids
- Discoveries by Akira Natori
- Discoveries by Takeshi Urata
- Named minor planets
- Astronomical objects discovered in 1991
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