M17 in Hydrogen-Alpha light

Final adjustments to the pier and mount have been completed and while I'm waiting for some cooler temperatures and lower humidity before starting the build of the observatory I hooked up my ASI1600mm camera to my GT102 and planned to spend about three nights imaging M17 in NB. M17, the Swan Nebula (Omega Nebula), is a vast star-forming region in Sagittarius where glowing hydrogen clouds are illuminated by hot, young stars.

The clouds (sort of) cooperated, but the Canadian wildfire smoke caused havoc on the sky transparency. I was able to get a total of 29 Ha and 21 S2 subs. Now it looks like the next few days will have significant smoke and then thunderstorms, so I need to pause the full NB capture. But since I had some decent Ha subs I went and processed a Hydrogen-alpha only version of M17. 

M17 - Swan Nebula
July 13-14, 2026 - GT102/ASI1600mm - 2.4 hours integration time

Rendered solely in hydrogen-alpha light, M17 appears less like a familiar nebula and more like a vast cloud of living fire suspended in darkness. The image is dominated by intricate folds of glowing gas, revealing delicate filaments, arcs, and rippling curtains sculpted by powerful stellar winds. Bright knots and ridges trace regions where intense radiation from young stars excites the surrounding hydrogen, causing it to shine with a deep, monochromatic brilliance. Every structure stands out in striking contrast, from dense pillars of obscuring dust to luminous fronts that resemble waves breaking across a cosmic shoreline.

Without the distraction of broadband color, the H-alpha view emphasizes the nebula's raw anatomy. Fine textures emerge throughout the cloud, exposing turbulent pockets, sweeping cavities, and branching networks of ionized gas stretching across the field. The famous swan-like silhouette of M17 becomes a study in light and shadow, its graceful curves etched in glowing hydrogen against an otherwise black backdrop. The result is both scientific and artistic: a portrait of an active stellar nursery where immense forces are continuously shaping and illuminating the interstellar medium.

I hope you like it.