Rosette Nebula closeup

Rosette Nebula & a star cluster NGC 2239

Nebula in HST-palette, Red=S-II, Green=H-a and Blue=O-III

Nebula in natural color. Narrowband channels are mixed to match visible spectrum. Red=80% H-alpha+20% S-II, Green=O-III and Blue=80% O-III+20% H-alpha to compensate otherwise missing H-beta.





Last two nights I used for the Rosette nebula, weather gets cloudy after the midnight at both evenings.

I was positively surprised about the image quality since Rosette Nebula doesn't raise very high up here North, the maximum elevation is about 30 degrees, seeing and transparency were both lousy too.



Processing work flow:

Image acquisition, MaxiDL v5.07.

Stacked and calibrated in CCDStack.

Deconvolution with a CCDSharp, 30 iterations.

Levels, curves and color combine in PS CS3.



Telescope, Meade LX200 GPS 12" @ f5

Camera, QHY9

Guiding, SXV-AO @ 9Hz

Image Scale, 0,75 arcseconds/pixel



Exposures

H-alpha 13x1200s, binned 1x1

Note.

Other channels are from a wide field image from 2009:

The original image can be found HERE



O-III 3x5min and S-II 3x5min with a Canon FD 200mm f1.8 @ f1.8

Wide field image of the Rosette Nebula in HST-palette