Celestial hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  B85  ·  HD164193  ·  HD164225  ·  HD164294  ·  HD164384  ·  HD164402  ·  HD164452  ·  HD164492  ·  HD164514  ·  HD164534  ·  HD164637  ·  HD164703  ·  HD164704  ·  HD164717  ·  HD164718  ·  HD164739  ·  HD164766  ·  HD164815  ·  HD164833  ·  HD164844  ·  HD164864  ·  HD164883  ·  HD313560  ·  HD313561  ·  HD313566  ·  HD313567  ·  HD313568  ·  HD313569  ·  HD313570  ·  HD313571  ·  And 63 more.
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M20 aka Trifid Nebula, David Swager
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M20 aka Trifid Nebula

Getting plate-solving status, please wait...
M20 aka Trifid Nebula, David Swager
Powered byPixInsight

M20 aka Trifid Nebula

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Description

A fun object and a great pre/post learning experience, to the extent that it's a photogenic object to begin with.  This object is unique as it represents an open star cluster, an  emission nebula (ionized gas from nearby hot stars in red),  a reflection nebula (clouds of dust being illuminated by nearby stars, i.e. the blue stuff) , and a dark nebula (dense molecular clouds that cause dark structures in the other nebulas).

In framing and post I tried to emphasize the trail of stars, including the open cluster M21, that are seemingly "left behind" this object. I was initially put off by the color balance of all the cosmic dust throughout the image, but now it has grown on me and I couldn't do without it. Funny, that. As always thanks to @Adam Block for his instructional videos, which I keep returning to for insights and techniques, and countless other resources.

This is roughly 30  hours of LRGB Data equally split between the L (60-90s exposures) and RGB (240-360s) summed.

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M20 aka Trifid Nebula, David Swager