M17 · Seestar S30 Pro · 2026-07-20

The Omega Nebula is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is by some of the richest starfields of the Milky Way, figuring in the northern two-thirds of Sagittarius. This feature is also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula, and catalogued as Messier 17 or M17 or NGC 6618.

[Source: Wikipedia, en.wikipedia.org/wiki/Omega_Nebula]

Sky Location

The chart above shows where this image sits on the night sky. The yellow outline is its field of view, with the picture itself drawn at its true orientation; north is up and east is left. Click the chart to zoom in, and use "open full resolution" for the full-size chart.

Image Details

PixInsight Processing

1. Fast Integration
2. Drizzle Integration
3. BlurXTerminator (AI deconvolution) (x2)
4. GraXpert (gradient removal)
5. Spectrophotometric Color Calibration
6. NoiseXTerminator (AI denoise)
7. Multiscale Adaptive Stretch

The Omega Nebula is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is by some of the richest starfields of the Milky Way, figuring in the northern two-thirds of Sagittarius. This feature is also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula, and catalogued as Messier 17 or M17 or NGC 6618.

[Source: Wikipedia, en.wikipedia.org/wiki/Omega_Nebula]

Sky Location

The chart above shows where this image sits on the night sky. The yellow outline is its field of view, with the picture itself drawn at its true orientation; north is up and east is left. Click the chart to zoom in, and use "open full resolution" for the full-size chart.

Image Details

AstroWizard Processing

1. Color calibration
2. BlurXTerminator (0.6)
3. NoiseXTerminator (0.9) (x3)