Sh2-239

November 2011

30 % resolution

60 % resolution

amera : Atik 383L+
lens: 12 " Newton f/2.95 (ASA reducer/corrector 2 " 0.73x)
filter : Baader LRGB
exposure software : Astroart 5.0
guiding: Pentax 75SDHC with Mintron MTV-12V6HC-EX and Guidemaster

exposure time :

LRGB
L : 48 x 5 min ( 4 hours )
R : 28 x 2 min ( 56 min / 2x2 bin )
G : 28 x 2 min ( 56 min / 2x2 bin )
B : 28 x 2 min ( 56 min / 2x2 bin )
total: 6 hours and 36 min

location : Home observatory Leopoldshöhe
image processing : Fitswork (image addition, Flat correction) / Astroart 5 / Regim (color calibration and Background processing) / PS CS5 (final processing)
spezifics : -
Here you can find a good articel :

http://articles.adsabs.harvard.edu//full/1979AJ.....84..548C/0000550.000.html