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There
            is a plethora of HII regions in Auriga, and this is one of the
            smallest. A combination of emission nebula and cluster, with
            a hint of blue reflection nebulosity makes it a really unique
            object. The star cluster, just below the red nebula is actually
            NGC1931, and contains the blue nebula. Its 10th magnitude and
            6 arcminutes in size. The nebula is Sharpless 237, which includes
            the blue nebula as part of it's description. Visually in the
            12.5 inch, the object appears as a nebulous star, with the "cluster"
            not being so obvious.
Instrument:  12.5" f/5 Home made Newtonian
Mount:  Astrophysics 1200 QMD
CCD Camera:  SBIG 10XME NABG with Enhanced Water Cooling
Guider: Meade DSI Pro  w/Lumicon Newt Easy Guider
Exposure:  LRGB = 120:20:20:20 
AstroDon RGB Combine Ratio:  1: 1.05: 1.2
Location:  Payson, Arizona, Elevation:  5150 ft.
Sky:  Seeing FWHM = 10 arcsec (Maxim DL - 10min subframe), Transparency 7/10
Outside Temperature:  35 F
CCD Temperature:  -30 C
Image Processing Tools: 
Maxim DL:  Calibration, deblooming (Starizona Debloomer), aligning, stacking
PixInsight:  Curves, Deconvolution
Photoshop CS2:  Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup

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