clic here for 50% size 1773 x 1271 (660 kB)
About this Image
The Dumbbell Nebula M27 was the first planetary nebula ever discovered, back in the year 1764 by Charles Messier.
This planetary nebula is certainly the most impressive object of its kind in the sky, as the angular diameter of the luminous body is nearly 6 arc minutes.
16" cassegrain in secondary focus at f/10
|Camera||SBIG STL-11000M at -15C, internal filter wheel|
|Filters||Astronomik Ha, LRGB|
|Date||July 16 - 17, 2006.|
|Sky Conditions||mag 5 sky, raw FWHM 1,8"|
Ha = 120 minutes (30 minute sub-exposures),
L:R:G:B = 60:30:30:30 min (10 minute subs)
Image aquisition in Maxim 4.11; Calibration and color combine in CCDstack;
H-alpha incorporated into red channel; final processing in Photoshop CS2;