NGC 5146: The Cocoon Nebula in Cygnus

The Cocoon Nebula is glowing interstellar gas (a HII region), a fairly bright (7.2 mg), and large (9') .

(IC 5146 refers to the nebula, NGC 5146 refers to the embedded cluster.)

Images taken: Oct. 16 - Nov. 2, 2023

Students: Riley Michelson, Lucy Elfert

Telescope: CDK 17 in; Camera: SBIG ST-10 CCD

Size of the images: 20'x30'.

Exposures: 1 hour each red, green, blue, H-alpha; 30 min SII

Image processing: CCDoops, CCDsoft, Photoshop CS.