M4 - Globular Cluster in Scorpius
with 8" f/3.9 Astrograph in Happy Jack
Uploaded 7/16/16

 
This
            stunning object can be found very close to the brilliant orange
            star Antares, near the heart of the scorpion. Notice that the
            core of this cluster contains a bar of stars oriented vertically,
            and hordes of very faint surrounding members!

            
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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