M 8 - Lagoon Nebula

Show astrometry data

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.

Object details

Nebula in Sagittarius

Right Ascension: 18h 03m 37s

Declination: −24° 23′ 12″

Magnitude: 6

Moon Age Average: 14.84 days

Moon Phase Average: 16.64 %

Additional images

Imaging Setup


SC Observatory, Central Thailand

Apr 23, 2017 and Apr 30, 2017
Officina Stellare RiFAST 400
Focal Length:
1520 mm
Paramount Taurus 400
FLI PL 16803
Image Scale:
1.22 arcseconds/pixel
Imaging Software:

TheSkyX Professional

Processing Software:

Adobe Photoshop

PixInsight 1.8

Exposure Detail

Filter Filter Brand Bin Qty Exposure
Ha Baader 1x 31 300
OIII Baader 1x 27 300
S2 Baader 1x 27 300

Total Exposure Time

7 hours, 5 minutes

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