NGC4725 Spiral Galaxy

 

NGC 4725 is a barred spiral galaxy with just one arm located in the constellation Coma Berenices. It is 40 million light-years away.




Equipment
TMB-130SS APO refractor at f/7 on an Astro-Physics 1200 equatorial mount
SBIG ST-8XM camera
SBIG CFW-10 filter wheel with Astrodon filters
Guiding: 60mm f/5 refractor and ST-402 camera
Imaging and autoguiding with MaxIm DL 4.62
Exposure
Luminance   1¾ hours (20 x 5 min), unbinned, -12°C
Red   1¼ hours (14 x 5 min.), binned 2x2, -25°C
Green   1¼ hours (15 x 5 min.), binned 2x2, -25°C
Blue   1¼ hours (15 x 5 min.), binned 2x2, -25°C
Processing Image calibration, registration, sigma-reject, mean-combine in CCDStack.
Levels, curves, highpass filter, color-combine in Photoshop CS3.
Date and Location 7 & 9 May, 2010    Montpelier, VA    N 37° 49' 12", W 77° 42' 06"