Focal Pointe Observatory
Astrophotography by Bob Franke

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NGC 7331 (The Dearlick Group)

 
 

Instrument

Celestron C11 @  F6.1 (1705 mm)  1.087 arcsec / pixel

Mount

Losmandy G11

Camera

SBIG ST-7 with CFW-8A color wheel

Acquisition Date

9/25/2006 to 9/29/2006  Near downtown Seattle

Exposure

Lum     380 min (76 x 5 min)  
Red       60 min (12 x 5 min)
Green    60 min (12 x 5 min)
Blue      66 min ( 8 x 7.5 min)

Software

CCDSoft, CCDOPS, DitherMatic was used to dither the luminance layer, Sigma Clip (pre beta 11), Paint Shop Pro, Photoshop CS w/ the Fits Liberator plug-in, GradientXTerminator and Noel Carboni's actions.

Comment

North is to the right.
Discovered by William Herschel in 1784.  NGC 7331 is often touted as a twin to our own Milky Way. About 50 million light-years distant in the northern constellation Pegasus, NGC 7331 was recognized early on as a spiral nebula and is actually one of the brighter galaxies not included in Charles Messier's famous 18th century catalog.