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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. |
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Mount |
Paramount ME |
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Camera |
SBIG STL-11000 w/ internal filter wheel, AstroDon Gen I Filters |
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Acquisition Data |
6/26/2010 to 6/29/2010 Chino Valley, AZ... with CCDAutoPilot3
& CCDSoft. AOL guided |
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Exposure |
Hα 510 min. (17 x 30 min. bin 2x2)
Click
here for an RGB color version.
Click
here for narrowband color mapped image |
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Software |
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CCDSoft, CCDStack,
Photoshop CS w/ the Fits Liberator plugin. Noel Carboni's actions.
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PixFix32 (pre-beta) to
repair hot/cold pixels and column defects.
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CCDStack to calibrate,
register, normalize, data reject, combine the sub exposures.
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PhotoShop for
on-linear stretching.
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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.
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