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Catalogue and alternative designations M8, NGC 6523, Lagoon Nebula


Type Emission Nebula 
Position 18 03 37, -24 23 12
Constellation Sagittarius
Camera and Telescope STXL11002 and 36.8 cm Ritchey Chretien
Focal Ratio F9
Exposure Details 450 minutes Hydrogen Alpha binned 1x1 with 3.5nm Baader filter

Colour version had 105 minutes luminance, 90 minutes red, green and blue, 180 minutes OIII all with Baader filters and binned 1x1

Description This well known emission nebula is easily visible with the naked eye under a dark sky and the nebulosity covers some 90' x 40' in total.  The estimated distance is is 4000-6000 light years.  The so called "hourglass nebula" is prominent at the top