The Lagoon Nebula (catalogued as Messier 8 or M8, and as NGC 6523) is a giant interstellar cloud classified as an emission nebula. It is one of only two star-forming nebulae faintly visible to the naked eye from mid-northern latitudes. Seen with binoculars, it appears as a distinct oval cloudlike patch with a definite core. A fragile star cluster appears superimposed on it.
On top of the nebula, there is a star cluster known as NGC 6530. This is a young cluster of about 2,000,000 years.
The picture is composed of 35 lights of 150" each, 35 darks and 40 bias, taken through the 70 mm refractor (ETX-70) mounted on the HEQ-5 (tracking not-guiding) and with the unmodded Nikon D3100 DSLR. The stacking was performed with DeepSky Stacker and processed with StarTools and Photoshop. The new workflow I'm following allows me to constrain the stars and its halo enhacing the main subject in the frame.
And the annotated image as usual:
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