Английская Википедия:2324 Janice
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Infobox planet
2324 Janice, provisional designation Шаблон:Mp, is a dark background asteroid from the outer regions of the asteroid belt, approximately Шаблон:Convert in diameter. It was discovered on 7 November 1978, by American astronomers Eleanor Helin and Schelte Bus at the Palomar Observatory in California.[1] The asteroid was named for Janice Cline at Caltech. The presumably C-type asteroid has a rotation period of 23.2 hours.[2]
Orbit and classification
Based on osculating Keplerian orbital elements, Janice is located in the region of the Themis family (Шаблон:Small), a very large family of carbonaceous asteroids, named after 24 Themis.[2]
When applying the hierarchical clustering method to its proper orbital elements, the object is both a non-family asteroid of the main belt's background population (according to Nesvorný),[3] as well as a core member of the Themis family (according to Milani and Knežević).[4]
It orbits the Sun in the outer main-belt at a distance of 2.5–3.6 AU once every 5 years and 5 months (1,977 days; semi-major axis of 3.08 AU). Its orbit has an eccentricity of 0.18 and an inclination of 0° with respect to the ecliptic.[5] The body's observation arc begins with its first observation as Шаблон:Mp at Lowell Observatory in June 1911, more than 67 years prior to its official discovery observation at Palomar.[1]
Physical characteristics
Janice is a presumed carbonaceous C-type asteroid which is the overall spectral type of members of the Themis family (Шаблон:Small).[2]
Rotation period
In October 2010, a rotational lightcurve of Janice was obtained from photometric observations by Gordon Gartrelle at the University of North Dakota Observatory in Grand Forks Шаблон:Obscode. Lightcurve analysis gave a tentative rotation period of 23.2 hours with a brightness amplitude of 0.19 magnitude (Шаблон:Small).[6] As of 2018, no secure period has been obtained.[2]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Janice measures between 24.33 and 31.19 kilometers in diameter and its surface has an albedo between 0.038 and 0.093.[7][8][9][10][11][12]
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 23.55 kilometers based on an absolute magnitude of 11.5.[2]
Naming
This minor planet was named after Janice Cline, who for many years has encouraged astrometric studies of minor planets at Caltech.[1] The official naming citation was published by the Minor Planet Center on 1 March 1981 (Шаблон:Small).[13]
References
External links
- Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – 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
- Background asteroids
- Discoveries by Eleanor F. Helin
- Discoveries by Schelte J. Bus
- Named minor planets
- Astronomical objects discovered in 1978
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