91 Aegina
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91 Aegina (from Latin Aegīna, Aegīnēta)<ref>Charlton T. Lewis, Charles Short, A Latin Dictionary</ref> is a large main-belt asteroid. It was discovered by French astronomer Édouard Jean-Marie Stephan on 4 November 1866. It was his second and final asteroid discovery. The first was 89 Julia. The asteroid's name comes from Aegina, a Greek mythological figure associated with the island of the same name.
This body is orbiting the Sun with a period of 4.17 years and an eccentricity of 0.105. The orbit of this object brings it to within Template:Convert of the dwarf planet Ceres, and the resulting gravitational interaction has been used to produce mass estimates of the latter.<ref name=Viateau1998/> The cross-section size of the asteroid is 110 km and it has a rotation period of six hours. The surface coloring of 91 Aegina is very dark and this C-type asteroid has probably a primitive carbonaceous composition. Observation of absorption bands at wavelengths of 0.7 and 3 μm indicate the presence of hydrated minerals and/or ice grains on the surface.<ref name=Howell2011/>
References
External links
- Lightcurve plot of 91 Aegina, Palmer Divide Observatory, B. D. Warner (2009)
- 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:JPL small body
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