NGC1491
Emission Nebula in Perseus
Uploaded 11/26/10

 

            
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This
            stunning tiny globular cluster in the Dolphin is 8.9th magnitude
            and 7 arc minutes in size. Most stars are 14th magnitude, with
            the faintest around 17 or so. This was one of the first few shots
            with the mirrors of the 12.5" inch recoated in August. Look
            at those neat orange stars!
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 = 5 arcsec (Maxim DL - 10min subframe), Transparency 9/10
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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