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1778 Alfvén
1778 Alfvén, also designated 4506 P–L, is a carbonaceous main belt asteroid, discovered on September 26, 1960 by Cornelis Johannes van Houten, Ingrid van Houten-Groeneveld and Tom Gehrels at Palomar, in San Diego, United States.〔
The asteroid is a member of the Themis family and has a calculated diameter of about 21 kilometers.〔 It orbits the Sun at a distance of 2.7–3.5 AU once every 5 years and 7 months (2,040 days). Its orbit shows an eccentricity of 0.13 and is tilted by 2 degrees towards the plane of the ecliptic.〔 It has a rotation period of 4.82 hours, measured in 2013.〔〔 The albedo of the C-type asteroid is around 0.08, based on assumptions made by the Collaborative Asteroid Lightcurve Link.〔
The designation ''P–L'' stands for ''Palomar–Leiden'', named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.
The asteroid was named after Swedish engineer, physicist and Nobel prize winner, Hannes Alfvén (1908–1995).〔
== 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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