4959 Niinoama

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4959 Niinoama (prov. designation: Template: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 Script error: No such module "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 Template: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 Template:MoMP was published by the Minor Planet Center on 10 November 1992 (M.P.C. 21132Script error: No such module "Check for unknown parameters".).[5]

Physical characteristics

Niinoama is an assumed C-type asteroid.[6]

Photometry

Photometric observations of Niinoama collected during 2008 show a rotation period of Script error: No such module "val". hours with a brightness variation of 0.32 ± 0.04 magnitude (U=3Script error: No such module "Check for unknown parameters".),[7] superseding an early measurement that gave Script error: No such module "val". hours (U=1+Script error: No such module "Check for unknown parameters".).[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

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  10. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
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External links

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