Английская Википедия:1429 Pemba
1429 Pemba, provisional designation Шаблон:Mp, is a stony background asteroid from the central regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 2 July 1937, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[1] The asteroid was named for the Pemba Island off the coast of Tanzania.[2]
Orbit and classification
Pemba is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the central main-belt at a distance of 1.7–3.4 AU once every 4 years and 1 month (1,492 days). Its orbit has an eccentricity of 0.33 and an inclination of 8° with respect to the ecliptic.[4] The body's observation arc begins with its official discovery observation at Johannesburg.[1]
Physical characteristics
Pemba is an assumed stony S-type asteroid.[5]
Rotation period
In September 1982, a rotational lightcurve of Pemba was obtained from photometric observations. Analysis of the fragmentary lightcurve gave a rotation period of 20 hours with a brightness amplitude of 0.3 magnitude (Шаблон:Small).[6] As of 2017, no secure period has been determined.[5]
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, Pemba measures between 8.71 and 10.75 kilometers in diameter and its surface has an albedo between 0.1316 and 0.196.[7][8][9][10][11]
The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE results, that is, an albedo of 0.1316 and a diameter of 10.37 kilometers based on an absolute magnitude of 12.74.[5][9]
Naming
This minor planet was named for the Pemba Island, Tanzania, part of the Zanzibar Archipelago, which was once under the rule of the Sultan of Zanzibar.[2] It is located off the East Coast of Africa in the Indian Ocean. The official Шаблон:MoMP was published by the Minor Planet Center in April 1953 (Шаблон:Small).[12]
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:Use dmy dates Шаблон:Minor planets navigator Шаблон:Small Solar System bodies
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- Английская Википедия
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- Discoveries by Cyril Jackson (astronomer)
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- Astronomical objects discovered in 1937
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