M17
About this celestial object
M17 glows as a compact summer nebula with a striking arc.
Also known as the Omega or Swan Nebula, this emission nebula lies in Sagittarius and ranks among the brighter H II regions of the Milky Way.
196 short exposures (~33 minutes) at 20.2° altitude and 74% humidity were gathered with 250 mm f/5—despite the low altitude the shape remains clearly defined.
Short frames reduce scintillation and keep stars and nebular contours tight.
Image and observation
Catalogue: M 17
Capture date: 2026-05-02
Total exposure: 2740 s
Imaging and processing: Ulrich Schwarz · Vespera Pro