About this Image
The colorful nebula Thor's Helmet (NGC 2359) is situated in Canis Major, very low for us northern observers.
In the case of this nebula all of the power and strength is derived from the very energetic star in the center of the bubble of gas.
This unusual star is classified as being "Wolf-Rayet" type and is very rare.
16" cassegrain in corrected primary focus at f/3
|Camera||SBIG STL-11000M at -30C, internal filter wheel|
|Filters||Astronomik Ha + RGB|
|Date||Mar 01-02, 2005.|
|Sky Conditions||mag 5 sky, temperature -10 C,|
Ha = 100 minutes (10 minute sub-exposures),
G:B = 60:60 min (10 minute sub-exposures).(
Image aquisition and color combine in Maxim, image calibration, aligning, DDP in ImagesPlus;
H-alpha 80% as L and 100% as red channel, O-III not used (blurred) curves, unsharp mask, color balance in Photoshop; Noise reduction by Neatimage for dark areas;
north is right;