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Exposure: LRGB 100:30:30:30 min
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L binned 1x1, RGB binned 2x2
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RGB Combine Ratios: 2.12:1.00:1.34
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Telescope: Meade 10" LX200 @ f/6.28
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Reduction from f/10 using Ted Agos' adapter
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Mount: Meade field tripod w/ super wedge
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Guiding: AO-7 @ 40Hz (L), 15Hz (RGB)
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Camera: SBIG ST-2000XM, SBIG CFW-8
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Location: My backyard in Goleta, CA
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Date/Time:
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L: August 2/3, 2003, 22:13-00:34 PDT
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RGB: August 3, 2003, 21:38-11:23 PDT
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Processing, Taken, and reduced in CCDSoft v5. Combined with Ray Gralak's
Sigma Clip. Curves applied in Photoshop. Slight increase in
color saturation in Photoshop. Four iterations of CCDSharp to Luminance.
Luminance applied in Photoshop @ 100%.
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Name: M20, The Trifid Nebula, NGC 6514, B85
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Type: Reflection/Emission Nebula and Star Cluster
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Constellation: Sagittarius
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Distance: 5000 light years
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Angular Diameter: 20' x 20'
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First Discovered By: Guillaume Le Gentil, 1747
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Documented by Messier: June 5, 1764
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