M21 is the open cluster at the upper left.

This image is cropped from the "Lagoon, Trifid, NGC 6559" image also on display.

• Object: Trifid Nebula (M20) in Sagittarius
• Exposure: 90 minutes @ f/6.7
• Telescope: Astro-Physics 130 EDF
• Mount: Astro-Physics 600E QMD
• Guiding: SBIG ST-4 @ 700mm (A2)
• Camera: Pentax 67
• Film: hypered Kodak PPF 400
• Location: Pearce, AZ
• Date: 24-May-01 00:38 MST
• Conditions: seeing 6/10, transparency 7/10, LMV 7.0, temperature 57° F
• Processing: UMAX PowerLook 3000, Adobe Photoshop 6.0.1