Ha only
HaOIIIOIIILRGB
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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 |