Focal Pointe Observatory
Astrophotography by Bob Franke

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DWB-111

The Propeller Nebula


      Click the full screen zoom button           ^
     
Click the image to Zoom and Pan              

Click here to view the image without Zoomify (1875 x 1250)

 

Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 1.28 arcsec / pixel.  The Zoomify image scale is 1.28 to 3.20 arcsec / pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Gen I Filters

Acquisition Data

6/26/2010 to 6/29/2010 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.  AOL guided

Exposure

Hα   510 min. (17 x 30 min. bin 2x2)

Click here for an RGB color version.

Click here for narrowband color mapped image

Software

  • CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin. Noel Carboni's actions.

  • PixFix32 (pre-beta) to repair hot/cold pixels and column defects.

  • CCDStack to calibrate, register, normalize, data reject, combine the sub exposures.

  • PhotoShop for on-linear stretching.

Comment

North ~ to the left.  The image is rotated 70° CCW


DWB-111, the Propeller Nebula, is an emission nebula in the constellation Cygnus. Astronomers seem to have more questions than answers, regarding this nebula. The origin of the peculiar structure is still completely unknown. The nebula's distance and source of excitation are also undetermined. DWB-111 mass is believed to be quite low, probably less than 50 solar masses. Obscuring dust is closely associated with the nebula, but seems to occur mostly in front of it.