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About this Image
The Nebula IC 4628, a beautiful, arc-like rim of nebulosity is situated in the far southern sky in the tail of Scorpius (from Zeta- to Mu-Scorpii).
It is quite faint and has often been overlooked because of it, even by southern observers. However, it is in a rich region, reflected in the number of names associated with the objects in the field illustrated here.
There is a large scattered star cluster, Collinder 316 which extends over the center of this picture.
The nebula itself is also known as Gum 56, after the Australian Colin Gum who catalogued emission nebulae in the southern sky using wide field photography.
The huge extent of this nebulosity can be seen in the wide field image here.
105mm TMB refractor with flattener at f/6.5
|Camera||SBIG STL-11000M at -20C, internal filter wheel|
|Filters||Astronomik H-alpha (15 nm) + RGB|
|Date||Aug 12, 2004.|
|Sky Conditions||mag 6.5, high transparency, temperature 12 C,|
Ha = 80 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;