常用在线工具

在线星图：

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https://gitee.com/apollo2036/DeepSkyCatalogs/raw/master/Format/Amateur/Books/Burnhams_DSO_List_Vol_I.xlsx
https://gitee.com/apollo2036/DeepSkyCatalogs/raw/master/Format/Amateur/Books/Burnhams_DSO_List_Vol_II.xlsx
https://gitee.com/apollo2036/DeepSkyCatalogs/raw/master/Format/Amateur/Books/Burnhams_DSO_List_Vol_III.xlsx
https://gitee.com/apollo2036/DeepSkyCatalogs/raw/master/Format/Amateur/Common/Deep-Sky%20Objects%20for%20Binoculars%20and%20the%20Naked-Eye.pdf
https://gitee.com/apollo2036/DeepSkyCatalogs/raw/master/Format/Amateur/Common/Farout%20NGC-IC.pdf

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1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers

3,000 Deep-Sky Objects: An Annotated Catalogue

A Buyer’s and User’s Guide to Astronomical Telescopes & Binoculars

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https://astronomy.stackexchange.com/questions/8175/the-name-of-a-particular-low-extinction-region

http://en.wikipedia.org/wiki/Lockman_Hole

It has a column density of neutral hydrogen of 6×10196×1019 cm−2−2, which will correspond to very little dust.

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HII regions in the Triangle galaxy, M33

http://www.astrosurf.com/patricio/DS/DS-M33-regHII.htm

The Triangle galaxy (M33, NGC 598) is one of the galaxies where it is easier to see internal structures. It is a relatively close galaxy that is located about three million light years away, it is flat and it is easy to appreciate its spiral structure even with small aperture telescopes. In addition, it is possible to observe many HII regions and star clouds.

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M8

详解礁湖星云.md

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NGC3372

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礁湖星云

https://skyandtelescope.org/observing/wallow-a-while-in-the-lagoon-nebula/

http://www.astrophoton.com/M008-12.htm

http://www.astrophoton.com/emission_nebulae.htm

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中心核球

从人马座和天蝎座的方向看，虽然银河系的中心被厚厚的尘埃云覆盖，但您仍然可以看到银河系的4层结构。 半人马座大星云是可见带中可见的银河系最深结构，也是肉眼可见的最远银河系结构。它从人马座gamma和delta向北延伸了几度，并且在小型双筒望远镜中看起来非常漂亮：它就像明亮的火焰，在其中可以辨别出许多闪亮的恒星。实际上，它是银河核球的一部分。

要注意区分人马座大恒星云和人马座小恒星云，后者才是M24，而前者十分巨大以及明亮，网络流传的大多只有后者没有前者。

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中心核球

向人马座和天蝎座方向望去，尽管银河系的中 心被浓厚的尘埃云遮盖，但仍然可以看到4层银河系结构。

人马大恒星云是可见光波段能看到的银河系最 深处的结构，同时也是肉眼可见的最远的银河系结 构。它从人马座gamma和delta向北延展几度，在小型双目望远镜中显得非常漂亮：就像是一朵明亮的火焰， 其中可分辨出大量闪亮的恒星。实际上，它是银河糸核球的一部分。

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