M27
Image details
The images was taken at 24/25 July 2008. The half full moon was partly present, rising around 23h. Visiblity was average. The telescope was not really polar aligned precisely. I took 5 Luminance images of 5 minutes each at 1x1 binning at a temperature of -5 degrees. The outside temperature was around 17-19 degrees. The RGB images (3x) and Ha images (4x) were taken at 2x2 binning with 2 minutes exposure time. Processing was done using the zone system and using Registar. for alignment and dark, flatfield and bias correction. All other processing was done in Photoshop.
Weakest visible detail: mag 16.4 determined by using TheSky data of M27 and using photometry in TeleAuto.
About M27
The Dumbbell nebula Messier 27 is a planetary nebula discovered in 1764 by Charles Messier. A planetary nebula is an object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. M27 has a distance of 1250 lightyears and a visual brightness of 7.4 mag. It has an estimated age of 3000 to 4000 years.