M39 and its surroundings (Wei-Hao Wang)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: M 39 · NGC 7092

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M39 and its surroundings

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M39 and its surroundings

An HaLRGB composition, two-frame mosaic.

Originally this was intended to be a simple, short-integration mosaic, just to fill in the time when the seeing was poor. Then after an initial processing of the LRGB data, I saw hints of red background nebulas. So I decided to add Ha data under moon light. It turns out there are indeed red nebulas everywhere in this field. The nebulas are faint, but nevertheless they can be imaged well even under bright moonlight. So I added Ha to the LRGB composition.

Rev.B shows the original LRGB image before Ha was taken. It can be seen that there are faint red patches in the background. This triggered the Ha exposures.

Rev.C is the Ha image. In most wide-field image that I have seen, this area does not strike me as an area with rich nebulosity. It's surprising that there is this much Ha emission everywhere with just moderate amount of exposures (under bright moonlight).

Final
Original
B
C

Deep Sky Mosaics
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