M20 - The Trifid Nebula in Sagittarius

Parallax Instruments 12.5" f/9 Ritchey Chretien

Yankee Robotics Trifid II 6303 CCD Camera

Astrodon HaLRGB filters

(L+Ha)RGB composite (L:60 Ha:90 RGB:60,60,60)

LRGB Sub-exposures: 10 min, Ha Sub-exposures: 20 min, RGB binned 2x2

Processed in CCDops, MaxIm/DL (with RC-Astro plug-in), Gralak Sigma, AIP4WIN, Picture Window and Adobe Photoshop

Taken July 5-7, 2005 from Eagle Ridge Observatory, Foresthill, CA

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