NGC6231 - Open Cluster in Scorpius
with 8" f/3.9 Astrograph in Happy Jack
Uploaded 6/11/18

 
This
            Magnificent 2.6th magnitude open cluster in the tail of Scorpius
            is perhaps one of the most overlooked gems in the summer sky.
            A quarter degree across, it is easily visible to the naked eye
            in the Table of Scorpius region.

            


            
Select an image size for a larger view:

1400 x 1290

Instrument:  8" f/3.9 Orion Astrograph Newtonian with Baader MPCC
Mount:  Home made GEM with Byers Starmaster Drive
Camera:  Canon XTi DSLR modified by Hutech for full spectrum
Guider: Meade DSI Pro  w/60mm piggyback refractor
Exposure:  15mins total
Location:  Happy Jack, Arizona, Elevation:  6800 ft.
Sky:  Seeing FWHM = 1 arcsec , Transparency 9/10
Outside Temperature:  55 F
Image Processing Tools: 
Maxim DL6:  Calibration, aligning, stacking
PixInsight:  Curves, Deconvolution
Photoshop CS2:  Curves, Color Correction, Gradient removal (Grad Xterminator), Cleanup

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