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1939 Loretta
1939 Loretta, provisional designation 1974 UC, is a dark, carbonaceous asteroid from the outer region of the asteroid belt, about 30 kilometers in diameter. It was discovered by American astronomer Charles Kowal at Palomar Observatory in San Diego County, California on 17 October 1974.〔
The C-type asteroid orbits the Sun at a distance of 2.7–3.5 AU once every five and a half years (2,014 days). With a semi-major axis of 3.12 AU, an eccentricity of 0.13 and a nearly coplanar orbit to the ecliptic– inclined by only 0.9 degrees, it is a typical member of the Themis family, a large group of outer-belt asteroids with similar orbital and spectral characteristics, named after the family's namesake and largest member, 24 Themis.〔〔
''Loretta'' has a relatively long rotation period of 25 hours, as measured by French astronomer Pierre Antonini in 2011.〔 Its geometric albedo of , and has been determined by the Akari, WISE and NEOWISE surveys, respectively.〔〔〔
The discoverer named the Themistian asteroid after his daughter, Loretta Kowal.〔
== 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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