32 31 30 29 28 27 26 25 24


NGC 6888


NGC6888: Crescent Nebula in Cygnus

RA = 20 hr 12 min; Dec = 38 deg 21 min

Date & Site:

Imaged on 6/8/18; Palomar Mountain

Conditions: temps in the mid 50's; breezy; good seeing.


Telescope: DSI RC10c; 1867 mm at f/7.3

Guider: Hutech OAG-5 with SBIG STi

Mount: AP1100 CP3GOTO
Camera: FLI 6303E; CFW 2-7; Astrodon Ha (3nm); RGB filters


Exposures: 120 min Ha and 30 min each RGB for a total of 3.5 hrs.

NGC 6888 also known as the Crescent Nebula is formed by the fast stellar winds from a Wolf-Rayet star colliding with and energizing the slower moving wind ejected by the same star when it evolved to a red giant 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. Discovered by Friedrich Wilhelm Herschel in 1792.

5000 light years away

Field of View = 52 x 35 arc minutes

Back to Images