Английская Википедия:31179 Gongju
Шаблон:Use dmy dates Шаблон:Infobox planet
31179 Gongju, provisional designation Шаблон:Mp, is a stony Nysian asteroid from the inner regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 21 December 1997, by Japanese amateur astronomer Naoto Sato at his Chichibu Observatory near Tokyo, central Japan.[1] The S-type asteroid has a rotation period of 4.8 hours and possibly an elongated shape.[2] It was named for the South Korean city of Gongju.[1]
Orbit and classification
Gongju is a member of the Nysa family (Шаблон:Small),[2][3] the largest asteroid family of the main belt, consisting of stony and carbonaceous subfamilies. The family, named after 44 Nysa, is located near the 3:1 orbital resonance with Jupiter, a depleted zone that separates the inner from the intermediate asteroid belt.[4]
It orbits the Sun in the inner asteroid belt at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,394 days; semi-major axis of 2.44 AU). Its orbit has an eccentricity of 0.19 and an inclination of 3° with respect to the ecliptic.[5] The body's observation arc begins with its observations as Шаблон:Mp at ESO's La Silla Observatory in October 1989, more than 8 years prior to its official discovery observation at Chichibu.[1]
Physical characteristics
Based on the Moving Object Catalog (MOC) of the Sloan Digital Sky Survey, Gongju has a spectral type of a stony S-type asteroid.[6]
Rotation period
In October 2012, a rotational lightcurve of Gongju was obtained from photometric observations by American astronomer John Ruthroff at the Shadowbox Observatory in Indiana. Lightcurve analysis gave a well-defined rotation period of 4.829 hours with a high brightness amplitude of 0.80 magnitude, indicative of a non-spherical shape (Шаблон:Small).[7]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Gongju measures 4.675 kilometers in diameter and its surface has an albedo of 0.353,[8][9] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 and calculates a diameter of 5.04 kilometers based on an absolute magnitude of 13.8.[2]
Naming
This minor planet was named after the South Korean city of Gongju, located in Chungcheongnam-do Province. It has a population of approximately 120,000 and was the capital of Baekje dynasty in the 5th century AD and the seat of the provincial government until 1932.[1] The official naming citation was published by the Minor Planet Center on 14 May 2014 (Шаблон:Small).[10]
References
External links
- Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (30001)-(35000) – 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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