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1339 Désagneauxa
1339 Désagneauxa, provisional designation 1934 XB, is an asteroid from the outer region of the asteroid belt, about 23 kilometers in diameter. It was discovered on 4 December 1934 by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa.〔 The body was independently discovered, just a few nights later, by the Russian and Belgian astronomers, Grigory Neujmin and Eugène Delporte, at the Crimean Simeiz and Belgian Uccle Observatory, respectively.〔
The S-type asteroid is a member of the Eos family, thought to have formed from a catastrophic collision of its parent body resulting in more than 4,000 known members of the family. It orbits the Sun at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,916 days). Its orbit shows an eccentricity of 0.06 and is tilted by 9 degrees to the plane of the ecliptic. It has a rotation period of about 9.4 hours.〔〔〔 Based on observations carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the Wide-field Infrared Survey Explorer, the body's geometric albedo is in the range of 0.13– 0.16, while the Collaborative Asteroid Lightcurve Link derives a value for its albedo of 0.17.〔〔〔〔
The discoverer, Louis Boyer, named the asteroid in honour of his brother-in-law.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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