M51
Whirlpool Nebula ~ Spiral Galaxy, type Sc, Canes Venatici
Click image for 1500x1000 view

ASA N16 f3.6
AP 3600GTO 'El Capitan"
SBIG STL-11000M

SBIG STL-Internal
April 2009. Cave Creek Canyon Observatory, Arizona Sky Village
Equipment:

Telescope:
Mount:
Camera:
Guider:
Filters:

- Luminance (Astrodon) 35x5 mins      = 350 mins
- Red
(Astrodon) 24x5 mins                    = 120 mins
- Green
(Astrodon) 24x5 mins                = 120 mins
- Blue
(Astrodon) 24x5 mins                   = 120 mins
 
Total Exposure Time =  11h 50m
Details:

Data Imaged remotely over 4 nights (Mar 30, Apl 17, 18 & 19).
2009, David A. Churchill