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About this Image
The area around the open cluster NGC6231 is embedded in huge emission nebulae, right from the center is IC 4628, a beautiful, arc-like rim of nebulosity.
The image is centered on the tail of Scorpius (from Zeta- to Mu-Scorpii).
The nebulae are quite faint and often have been overlooked because of it, even by southern observers.
Canon EF 200mm f/2.8 L at f/2.8
|Camera||SBIG STL-11000M at -20C, internal filter wheel|
|Filters||Astronomik H-alpha (15 nm) + RGB|
|Date||Aug 15, 2004.|
|Sky Conditions||mag 6.5, high transparency, temperature 10 C,|
Ha = 100 minutes (10-minute sub-exposures),
RGB= 15:15:15 min (5-minute sub-exposures)
Image aquisition in Maxim DL 4.0; Image calibration, aligning, mean stacking, DDP and color synthesis in ImagesPlus;
Photoshop: H-alpha blended to red and L channel; cropped, Noise reduction by Neatimage;