1355 Magoeba
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1355 Magoeba, provisional designation Template:Mp, is a Hungaria asteroid and a suspected contact-binary from the innermost regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 30 April 1935, by English-born, South African astronomer Cyril Jackson at the Johannesburg Observatory in South Africa.[1] The asteroid is named for Magoeba, a tribal chief in the South African Transvaal Province.[2]
Orbit and classification
Magoeba is a member of the Hungaria family, which forms the innermost dense concentration of asteroids in the Solar System. It orbits the Sun in the inner main-belt at a distance of 1.8–1.9 AU once every 2 years and 6 months (922 days). Its orbit has an eccentricity of 0.04 and an inclination of 23° with respect to the ecliptic.[3] The first precovery was taken at Nice Observatory just 3 day prior to its official discovery. The body's observation arc begins at Johannesburg the night after its discovery observation.[1]
Physical characteristics
Lightcurves
Between 2006 and 2014, several rotational lightcurves of Magoeba were obtained by American astronomer Brian Warner at the CS3–Palmer Divide Station (U82Script error: No such module "Check for unknown parameters".) in California. Lightcurve analysis of the photometric observations taken during the asteroid's 2014-apparition gave a rotation period of 2.971 hours with a brightness variation of 0.09 magnitude (U=3Script error: No such module "Check for unknown parameters".).[4]Template:Efn
Previously derived periods varied strongly (5.99 and 31.65 hours) with alternative period solutions (U=2-/2/2Script error: No such module "Check for unknown parameters".).[5][6][7]Template:Efn The Observation were taken at the Palmer Divide Observatory (716Script error: No such module "Check for unknown parameters".) in Colorado (see video in Template:Section link). It is now suspected that this discrepancy might be caused by the presence of an asteroid moon that orbits Magoeba with a period of 15.05 hours.[4]
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Magoeba measures 4.276 and 4.828 kilometers in diameter, and its surface has an albedo of 0.582 and 0.466, respectively,[8][9] while a polarimetric study of Hungaria asteroids found a lower albedo of 0.267.[10] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between 0.4 and 0.2, corresponding to the Hungaria asteroids both as family and orbital group – and calculates a diameter of 5.96 kilometers with an absolute magnitude of 13.05.[11]
Spectral type
In the Tholen taxonomy, Magoeba is an X-type asteroid, which can be further divided into the bright E, the metallic M and the carbonaceous P classes, with similar spectra but very different inferred mineralogies.[12] It has both been classified as an E-type asteroid by the WISE/NEOWISE mission, and as a M-type asteroid by a dedicated spectroscopic survey at the Argentinian Lencito Complex, respectively.[9][12]
Naming
This minor planet was named for Magoeba, a native chief of the North Transvaal in South Africa.[2] The official Template:MoMP was published by the Minor Planet Center in April 1953 (M.P.C. 908Script error: No such module "Check for unknown parameters".).[13]
Notes
References
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External links
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- Dynamical evolution of the Hungaria asteroids
- Asteroid Lightcurve Database (LCDB), query form (info Template: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
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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