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Monday, October 3, 2011

First light for the Autumn season 2011


Last night I managed to fix my "backup camera", some soldering and tweaking was needed but it worked out.
My first target was the "Propeller Nebula" in constellation Cygnus.

DWB 111, the Propeller Nebula
Ra 20h 17m 57s Dec -+44° 09′ 20″ in constellation Cygnus

HST-palette, (HST=Hubble Space Telescope)
from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.

Propeller Nebula (DWB 111, MRSL 497). This S-like formation is part of the much large area of emission nebulae in Cygnus. There are very little information around, the origin and distance  of this structure is unknown. It seems to be mostly front of the associated nebula. I will make an experimental 3D-study out of this later. 

A closeup from the image above.

Image is in Natural color palette from the emission of ionized elements, 
R=Hydrogen + Sulfur, G=Oxygen and B=Oxygen + Hydrogen.

Technical details:

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations.
Levels, curves and color combine in PS CS3.

Optics, Tokina AT-X 300mm camera lens at f2.8
Camera, QHY9 Guiding, SXV-AO @ 6,5Hz
Image Scale, 3,5 arcseconds/pixel
Exposures H-alpha 15x1200s, binned 1x1
H-alpha 10x1200s, binned 1x1
O-III 14x1200s, binned 1x1
S-II 5x1200s, binned 2x2
Total exposure time ~10h

An experimental starless image shows the actual nebula better.


It looks to me, that there is something going on at Two a clock position in this image. It could be a planetary nebula? There are nearly five hours of O-III in this image, with a fast f2.8 optics, so the emission of ionized Oxygen is not very strong. I couldn't find this feature from PN database, I must study this more later.

Here is a closeup of the area of interest

Just a stretched O-III & H-alpha channels animated

Not much, after about Five hours of exposures. There is nothing visible, about this shape, at S-II channel. Centeroid of the brightest spot is,  Ra 20h 10m 39.7s Dec -+44° 12′ 01.9" and the diameter about 360 arc seconds.


Iiro Sairanen, from a Finnish astro group "", found this PN candidate from the Simbad database :
It's known under a name PN PM 1-320

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