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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 STXL6303 and 36.8 cm Ritchey Chretien
Focal Ratio F9
Exposure Details

The top is a Hubble palette image (SII:Ha:OIII) with Hydrogen Alpha=120 minutes, Sulphur II= 420 minutes and Oxygen III=450 minutes.  Astrodon series 2 3nm band pass filters were used.

A bicolour image (HaOIIIOIII) with near natural colours is below.  Short RGB image incorporated for the stars

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 left