Emission/Reflection Nebula in Auriga

Uploaded 12/28/10

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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 HOME GALAXIES EMISSION NEBS REFLECTION NEBS COMETS GLOBULARS OPEN CLUST PLANETARIES LINKS