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Thursday, November 13, 2014

DWB-111, the Propeller nebula

The data for this object is shot at 31.10 last month but I got it processed just now.
The data for the emission of ionized Oxygen and Sulfur (O-III and S-II) is borrowed from my wide field shot of the area back from the first light image of Autumn 2011.

DWB-111, the Propeller Nebula
In constellation Cygnus, click for a large images

Mapped colors from an emission of the ionized elements, Red=Sulfur, Green=Hydrogen and the Blue =Oxygen.

An experimental starless view

The actual nebula stands out nicely in this experimental starless version of my photo.


Propeller Nebula (DWB 111, MRSL 497). This S-like formation is part of the much large area of emission nebula in constellation Cygnus. There are very little information about the origin and distance of this structure is unknown.

Image in visual colors

Emission line channels are combined to match to a visual spectrum.

A wide field image of the nebula

A wide field image from the Autumn 2011. More info and image in this blog post:
Also O-III and S-II channels are borrowed from this photo.

Orientation in Cygnus

The area of new photo is marked as a white rectangle.

Technical details

Processing work flow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Celestron Edge HD 1100 @ f7 with 0,7 focal reducer for Edge HD 1100 telescope

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x2
Astrodon filter, 5 nm H-alpha

Exposure times
H-alpha, 12 x 1200s = 4h
O-III & S-II from an older wide field photo of mine.

A single un cropped, calibrated and stretched 20 min. H-alpha frame

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