Astronomy Picture of the Day——你所看到的猎户座​

The Orion You Can Almost See 
Image Credit & Copyright: John Gleason & Rogelio Bernal Andreo

Explanation: Do you recognize this constellation? Although it is one of the most recognizable star groupings on the sky, this is a more full Orion than you can see -- an Orion only revealed with long exposure digital camera imaging and post-processing. Here the cool red giant Betelgeuse takes on a strong orange tint as the brightest star at the lower left. Orion's hot blue stars are numerous, with supergiant Rigel balancing Betelgeuse on the upper right, and Bellatrix at the upper left. Lined up in Orion's belt are three stars all about 1,500 light-years away, born from the constellation's well-studied interstellar clouds. To the right of Orion's belt is a bright but fuzzy patch that might also look familiar -- the stellar nursery known as Orion's Nebula. Finally, just barely visible to the unaided eye but quite striking here is Barnard's Loop -- a huge gaseous emission nebula surrounding Orion's Belt and Nebula discovered over 100 years ago by the pioneering Orion photographer E. E. Barnard.

你所看到的猎户座

你认出这个星座了吗？虽然它是天空中最知名的星团之一， 这是一个比我们平时看到的的更加完整的猎户座——一幅长时间曝光数码成像并通过后期处理。在图像中，闪亮的红巨星参宿四呈现出强烈的橙色光芒，成为左下方最明亮的星。猎户座有很多炙热的蓝色恒星，在右上方与参宿四轴对称的是参宿七，左上角是参宿五。在猎户座的腰部区域排列着三颗恒星，距离地球约1500 光年，它们诞生于星系尘埃之中。猎户座腰部区域的右侧是一个明亮但略微模糊的斑点，这是我们看起来比较熟悉的区域——通常称为猎户座星云 。最后，肉眼几乎看不见， 但最引人注目的是巴纳德环路， 一个围绕着猎户座的巨大的气体发射星云，这是在100多年前由摄影师巴纳德发现的。

高清原图地址：

https://apod.nasa.gov/apod/image/1908/OrionDeep_GleasonAndreo_1080.jpg

近期文章：

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Astronomy Picture of the Day——超越

NASA

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