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M41

梅西耶 41
Credit: 2MASS/NASA
觀測資料 (J2000 曆元)
星座大犬座
赤經06h 46.0m[1]
赤緯-20° 46′[1]
距離2,300 ly[2] (710 pc)
視星等 (V)4.5[1]
視大小 (V)38 弧分[2]
物理特徵
半徑12.5 ly
估計年齡190 million yrs[3]
其他特徵M41,[1] NGC 2287[1]
相關條目:疏散星团NGC天體表

M41(又稱NGC 2287)是位於大犬座的一個疏散星團,它是義大利天文學家喬瓦尼·巴蒂斯塔·奧迪耶納早在1654年以前就發現的星團,而且亞里斯多德有可能在前325年就知道它的存在[4]

性質

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M41幾乎就位於天狼星的正南方,相距僅僅只有4度左右,並且大犬座μ2構成一個三角形,並且使用雙筒望遠鏡可以在視野中同時看見這三個天體。這個星團涵蓋的區域大約與滿月相當 [5],包含百餘顆恆星,其中有幾顆是紅巨星,還有一些白矮星。最亮的一顆靠近星團的中心,視星等為6.3等,是光譜類型為K3的巨星[6][7][8]。估計這個團正以每秒23.3公里的速度遠離地球[1]。這個星團的直徑在25-26光年,年齡大約是1億9000萬年,但是依據星團的屬性和動態,認為這個星團的壽命大約只有5億年,而在這之前就會瓦解[3]

沃爾特·史考特·休斯頓用小望遠鏡描述了這個星團的外觀[9]

許多目視觀測者表示看見M41的恆星形成曲線。它們在照片中雖然不顯眼,但在我的10吋反射望遠鏡這些曲線卻很明顯,而且靠近星團中心的亮紅色恆星非常突出。

相關條目

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參考資料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 SIMBAD Astronomical Database. Results for Messier 41. [2006-12-21]. (原始内容存档于2019-05-01). 
  2. ^ 2.0 2.1 Messier Object 41. SEDS. [2009-12-10]. (原始内容存档于2015-02-21). 
  3. ^ 3.0 3.1 Stoyan, Ronald. Atlas of the Messier Objects: Highlights of the Deep Sky. Cambridge University Press. 2008: 171 [9 July 2015]. ISBN 9780521895545. (原始内容存档于2020-07-20). 
  4. ^ M41 possibly recorded by Aristotle. [2016-01-10]. (原始内容存档于2017-04-18). 
  5. ^ Kambic, Bojan. Viewing the Constellations with Binoculars: 250+ Wonderful Sky Objects to See and Explore. New York, New York: Springer. 2009: 230 [2016-01-10]. ISBN 0387853553. (原始内容存档于2015-01-02). 
  6. ^ Koester, D. Reimers, D. (1981), "Spectroscopic identification of white dwarfs in Galactic Clusters I. NGC2287 and NGC3532", Astronomy & Astrophysics, 99, L8-11
  7. ^ De Laet, Rony. The Casual Sky Observer's Guide: Stargazing with Binoculars and Small Telescopes. New York, New York: Springer. 2011: 95–97 [2016-01-10]. ISBN 1461405955. (原始内容存档于2014-03-16). 
  8. ^ Dobbie, P., Day-Jones, A., Williams, K., Casewell, S., Burleigh, M., Lodieu, N., Parker, Q., Baxter, R., (2012), "Further investigation of white dwarfs in the open clusters NGC2287 and NGC3532", Monthly notices of the Royal Astronomical Society, 423, 2815-2828
  9. ^ Houston, Walter Scott. Deep-Sky Wonders. Sky Publishing Corporation. 2005. ISBN 1-931559-23-6. 

外部連結

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M41
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