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IC 5146 – The Cocoon Nebula is a striking emission and reflection nebula located in the constellation Cygnus, approximately 4,000 light-years away from Earth. It is often celebrated for its combination of glowing gas, dark dust lanes, and a central open star cluster. The nebula itself is an active stellar nursery, where new stars are forming within dense molecular clouds.
The “cocoon” appearance comes from a bright cluster of young stars at the center, whose intense radiation illuminates the surrounding hydrogen gas, causing it to emit a vivid red glow. Surrounding this core, dark lanes of interstellar dust weave through the nebula, creating a visually stunning contrast with the bright gas. The nebula also reflects the light of its young stars in patches of bluish reflection nebula.
IC 5146 spans roughly 12 arcminutes across the sky and is accompanied by an extensive molecular cloud stretching westward, which forms a dark, elongated region known as the Cocoon Nebula filament. It is a favorite target for astrophotographers due to its intricate structures, rich colors, and the delicate interplay between light and dark regions.
Technical Details
Telescope: Celestron C8 SCT (8″ Schmidt-Cassegrain) with Celestron 0.63 Focal Reducer
Auto Focus: Celestron Electronic Auto Focuser
Astronomy Camera: ZWO ASI533MC Pro
Filter: Optolong UV-IR cut filter; 120 exposures @ 60 seconds each (2 hours)
Filter: Antlia ALP-T Dual Narrowband Ha/Oiii Filter; 196 exposures @ 5 minutes each (16.3 hours)
Total Integration Time: 18.3 hours
Off-Axis Auto Guiding: ZWO OAG-L
Auto Guiding Camera: ZWO ASI174MM Mini Guide Camera
Telescope Mount: Sky- Watcher EQ6-R Pro Equatorial Mount
Telescope Computer: BeeLink GK-55 Mini PC / Windows 10 Pro
Wireless Communication: GL-iNEt Beryl Travel Router
Telescope Control & Image Capture Software: Nighttime Imaging ‘N’ Astronomy (N.I.N.A.)
Image Integration Software: Astro Pixel Process, by Aries Productions
Image Post Processing Software: PixInsight, by Pleiades Astrophoto
Images captured in Palm Springs, CA during October 2023. Dark sky classification = Bright suburban sky (Bortle 6).