Hubble Palette (Red=SII, Green=Hydrogen Alpha, Blue=OIII)


Catalogue and alternative designations

M17, Swan Nebula, Omega Nebula, NGC 6618

Type Emission Nebula
Position 18 20.8, -16 11
Constellation Sagittarius
Camera and Telescope STXL6303E and 36.8 cm Ritchey Chretien
Focal Ratio F9
Exposure Details 300m SII (5nm filter), 360m OIII (3nm filter) and 220m Ha (3nm filter) with Astrodon series 2 filters.  
Description M17 is one of the brightest and most detailed emission nebulae in the sky with the brightest portions being roughly 15' x 3'.  The entire nebula, however, spans 46' x 37' and is estimated to be about 5868 light years distant.