1246 Chaka
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1246 Chaka, provisional designation Template:Mp, is a background asteroid from the central regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 23 July 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[1] The uncommon A/Sl-type asteroid has a longer than average rotation period of 25.5 hours.[2] It was named for the Zulu King Shaka.[3]
Orbit and classification
Chaka is a non-family asteroid from the main belt's background population.[4][5] It orbits the Sun in the central asteroid belt at a distance of 1.8–3.4 AU once every 4 years and 3 months (1,549 days; semi-major axis of 2.62 AU). Its orbit has an eccentricity of 0.31 and an inclination of 16° with respect to the ecliptic.[6] The body's observation arc begins with its first observation at Johannesburg on 4 July 1932, three weeks prior to its official discovery observation.[1]
Naming
This minor planet was named after Shaka (c.1787–1828), also Chaka or Tchaka, founder and one of the most influential monarchs of the Zulu Kingdom. The official Template:MoMP was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 115Script error: No such module "Check for unknown parameters".).[3]
Physical characteristics
ChakaTemplate:'s spectral type has been determined during the Small Solar System Objects Spectroscopic Survey (S3OS2). In the Tholen-like taxonomic variant of the survey, the asteroid is a rare A-type, while in the SMASS-like variant it is a Sl-subtype, that transitions between the common S- and uncommon L-type asteroids.[4][7]
Rotation period
In October 2013, a rotational lightcurve of Chaka was obtained from photometric observations by Joe Garlitz at his Elgin Observatory. Lightcurve analysis gave a well-defined rotation period of Script error: No such module "val". hours with a brightness amplitude of 0.18 magnitude (U=3Script error: No such module "Check for unknown parameters".).Template:Efn Other period determinations were made by European astronomers (20 h; Δ0.2) at OHP and La Silla in October 1996 (U=2Script error: No such module "Check for unknown parameters".),[8] and by Andrea Ferrero (25.44 h; Δ0.25) at the Italian Bigmuskie Observatory Template:Obscode in November 2013 (U=2Script error: No such module "Check for unknown parameters".).[9]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Chaka measures between 17.63 and 20.84 kilometers in diameter and its surface has an albedo between 0.195 and 0.310.[10][11][12][13][14][15] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.2351 and a diameter of 18.11 kilometers based on an absolute magnitude of 10.9.[2]
Notes
References
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External links
- Elgin Observatory, Backyard Amateur Astromomy [sic]
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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