Date: 2/26/2012
Description: NGC 891 (also known as Caldwell 23) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster. It has an H II nucleus. The object is visible in small to moderate size telescopes as a faint elongated smear of light with a dust lane visible in larger apertures. [Ref: WikiPedia]
Sky Conditions:
Clear sky, little winds (3 mph average)
Urban Light Pollution
FWHM: 3.5 - 4.0 arc sec/pixel
Imaging:
Exposure: 96 min (16 x 6min) at 2x2 bin
Guiding: 5.5 sec at 2x2 bin
Equipment:
SBIG ST-20000CM
AT10RC at F8 with CLS Filter
Starlight Focuser
480mm Guide-scope STi guider
AP1200 mount
SW:
Maxim DL V5, FocusMax, CCD-autopilot V4, Robofocus, SkyX
Photoshop CS4 (processed slight unsharp mask, image scaled 2x, enhance DSO and space noise reduction actions)