Size Comparison between Simeis 147 and Full Moon

Simeis 147

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Copyright Steve Cannistra

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FOV: approximately 3.9
x 3.9 degrees (two panel mosaic)
RA (J2000): 05h 43m 12s
Dec (J2000): +28 degrees 17' 00"
Position Angle: +0 degrees

Please see previous page  for description of Simeis 147.  In the above image, I superimposed one of my old images of the full moon for a size comparison (i.e., this is a digital composite, not an actual shot of the full moon next to Simeis 147).  The full moon measures 0.5 degrees (30 arcminutes) in angular diameter, whereas the full extent of Simeis 147 is larger than 3 degrees!

Photographic Details:
Date:  Ha- October 22, 2007 (bottom half); December 13, 2008 (top half).  The years are correct- I did not get a chance to acquire the top half of this image until now!
Scope:  Takahashi FSQ106 at f5 on the Takahashi NJP Mount
Autoguider:  SBIG ST-402 with 60mm guidescope, focal length 227mm
Camera:  STL11K -20C
Baader 7nm Ha filter, 50.8mm unmounted
Exposures:  Ha for each half was 210'; Total exposure 7 hours
Post-processing:  Calibrated, aligned, and Sigma Clip combined in Maxim, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS (16 bit format)

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