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1809 Prometheus, also designated 2522 P–L, is an asteroid from the outer region of the asteroid belt. It was discovered on September 24, 1960 by the Dutch astronomer couple Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at Palomar, San Diego County, California.〔 The asteroid orbits the Sun at a distance of 2.6–3.2 AU once every 5 years (1,829 days). Its orbit has an eccentricity of 0.10 and is tilted by 3.3 degrees to the plane of the ecliptic.〔 Little is known about the asteroids size, composition, albedo and rotation, despite having a well-observed orbit with the lowest possible uncertainty of 0 and an observation arc that spans over a time period of more than 60 years.〔 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 is named after Prometheus, a Titan of a Greek saga, who stole the fire from the gods. The name has also been given to a moon of Saturn, Prometheus (moon), discovered by the Voyager 1 spacecraft in 1980.〔 The minor planet 1810 Epimetheus is named after his brother. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「1809 Prometheus」の詳細全文を読む スポンサード リンク
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