|
NGC 2261 (also known as Hubble's Variable Nebula or Caldwell 46) is a variable nebula located in the constellation Monoceros. It is illuminated by the star R Monocerotis (R Mon), which is not directly visible itself. NGC 2261 was imaged as Palomar Observatory's Hale Telescope's first light by Edwin Hubble on January 26, 1949,〔http://365daysofastronomy.org/2009/01/26/january-26-60th-anniversary-of-hale-telescope-first-light/〕 some 20 years after the Palomar Observatory project began in 1928. Hubble had studied the nebula previously at Yerkes and Mt. Wilson.〔 One explanation proposed for the variability is that dense clouds of dust near R Mon periodically block the illumination from the star.〔(【引用サイトリンク】 work=SAO/NASA ADS Astronomy Abstract Service )〕 ==See also== *NGC 1555 *New General Catalogue 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「NGC 2261」の詳細全文を読む スポンサード リンク
|