Astronomy Picture of the Day——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 about1,500 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.

猎户座

你认识这个星座吗？它就是天空中那个最容易辨认的星座，这是比你能看到的更完整的猎户座，只有借助长曝光和数字处理之后才能呈现出来的猎户座。在这里，最为明亮的冷红巨星参宿四在左下方呈现出强烈的桔色光晕。猎户座里炽热的蓝星数量庞大，超巨星参宿七位于右上方，参宿五在左上方。猎户腰带三星距离地球约1500光年。猎户腰带的右面是一个明亮却模糊的光斑，那就是熟悉的猎户座大星云。最后，肉眼不易看到，但在这里却相当震撼的是巴纳德圈，这是一个围绕猎户腰带和猎户星云的巨大气态辐射星云，100多年前由摄影师巴纳德所发现。

高清原图地址：

https://apod.nasa.gov/apod/image/1908/OrionDeep_GleasonAndreo_2048.jpg

近期文章：

Astronomy Picture of the Day——秋分：冬至到夏至的太阳

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

Astronomy Picture of the Day——蜘蛛星云的红外影像

NASA

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