M20 - The Triffid Nebula - this time with a mono camera and LRGB. (Cosgrove's Cosmos (Patrick Cosgrove))

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: B85 · M 20 · NGC 6514 · Sh2-30 · Trifid Nebula

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M20 - The Triffid Nebula - this time with a mono camera and LRGB.

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M20 - The Triffid Nebula - this time with a mono camera and LRGB.

M20 - The Triffid Nebula. I actually shared a shot of this object earlier this year, taken with my OSC (One Shot Color) camera and my main scope. This one was taken with my new rig using a cooled mono camera and LRGB filters from by filter wheel. This scope has a longer focal length, so the scale of the image is larger that in my previous shot. This one was taken on the 7-17-20, the same night as my Elephant's Trunk Nebula. It is the result of 10 x120 second luminance images, and 8x120 second images for RGB filters. I had some difficulty processing this image but I have now sorted that out and this is my resulting output. A mono camera is a lot more work. For example, files for this project top out at 12GB once you count all of the Dark, flats, and boas calibration exposures. But with a relatively small number of subs you can get a great signal-to-noise ratio. One shot color cameras typically use a RGGB Bayer filter pattern. So every 2x2 block of. pixels have 1 red, 1 blue, and 2 green pixels. On a mono camera, all 4 pixels are used for one color. So when you think about it, a one shot color camera has 25% of its pixels measuring R and B each, and 50% of its pixels measuring G. BUT - with the possible exception of a few planetary nebulae, there are almost NO green colored objects on the night sky. So half your signal is kind of wasted. A mono camera is much more efficient. On the other hand - its also kind of a pain in the but and a lot more work. You really can't beat the convenience of an OSC!

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Status	Advanced success
Started	...
Astrometry.net job	3692902
PixInsight job	N64X7C7ELYUXRHP6W1YGY0C4RCHCVAGQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	18h02m41s.650
RA (top/left)	18h03m55s.778
RA (top/right)	18h04m05s.625
RA (bottom/right)	18h01m26s.814
RA (bottom/left)	18h01m16s.110

Dec (center)	-22°58′51″.50
Dec (top/left)	-23°24′03″.80
Dec (top/right)	-22°35′23″.43
Dec (bottom/right)	-22°33′36″.12
Dec (bottom/left)	-23°22′15″.48

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M20 - The Triffid Nebula - this time with a mono camera and LRGB.

M20 - The Triffid Nebula - this time with a mono camera and LRGB.

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M20 - The Triffid Nebula - this time with a mono camera and LRGB.

M20 - The Triffid Nebula - this time with a mono camera and LRGB.

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