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Trifid Nebula and M21 Open Cluster
M20 & M21
Type Diffuse Nebula
Constellation Sagittarius
Distance 5,200 ly
More Info
Date 31 Aug 2008 (Summer)
Place Palomar Mountain, CA
Exposure Data RGB 60:60:60 mins @ -15C
R 6x10, G 6x10, B 6x10 (bin 1x1)
Optics Takahashi FSQ-106N Refractor
Focal Length 530mm @f/5
Mount Astro-Physics 900GTO
Camera SBIG ST-2000XM
Focuser Robo-Focus
Filters CFW10A, Astrodon RGB
Software CCD Commander, Maxim DL, CCDStack, Photoshop