Image Contains: Hourglass nebula, Lagoon nebula, M 8, NGC 6523, NGC 6526, NGC 6530, The star 7Sgr, The star 9Sgr
The Lagoon Nebula (M8) is an emission nebula in the constellation Sagittarius, approximately 4,000-6,000 light years from Earth. For us in Thailand, objects in the Sagittarius Milky Way arrive late in our imaging season. We were fortunate to collect this data before the 2017 rainy season kicked in full gear.
This image was shot over two nights a week apart using narrowband filters. 85 individual 5-minute unguided subs were calibrated, stacked and processed in PixInsight to create master Hydrogen Alpha (Ha), Oxygen III (O3) and Sulfur II (S2) images (see "Additional Images" gallery below). Ha was mapped to Green, O3 to Blue, and S2 to Red in Photoshop, where Hubble palette color was corrected and detail and contrast enhanced. Stars were shrunk in PixInsight. Final tweaking back in Photoshop.
SC Observatory, Central Thailand