[3] M20, Trifid Nebula in Sagittarius
Photographer:
 
Al Brockman
Telescope:
 
Takahashi FSQ-106 at f/5 with 1.8x Extender-Q giving f/9
Orientation::
  Ø20' x 20', m6.3 (cluster), RA 18h02.5m, Dec -23°02'
Camera:
  SBIG STL-11000M CCD
Image Scale:
  3.5 arc sec/pixel, FOV:156 x 234 arc min
Mount:
  Paramount ME on ATS Portable Pier
Exposure type
  L 5 x 300", Binned 1x1, RGB 6 x 300", Binned 2x2
Location:
  Ningaloo Skies Observatory, Exmouth, WA on 2008, Jan 27
[ Click on image for larger size (1156 x 920, 349kb ]
SMC

Additional Notes:

The Trifid Nebula shines with the characteristic red glow of hydrogen gas that is energized by young, hot stars embedded in the nebula's core (emission nebulosity). M20 is also tinged with blue starlight scattered by interstellar dust particles (reflection nebulosity).

 
 
 
 
Design and production 2009 by Al Brockman