M4 in Scorpius



Scope: C8 f/4.3; Location: Del Mar, CA; 28 June 2006; Camera: Artemis285

Exposure: 12 x 60 sec Luminance exposures with UV/IR Block Filter, 8 x 45 sec RGB 

Processing: Images were captured Artemis Capture (as FITs). Aligned/stacked in Registax 3 and saved as FITS. Luminance and Color channels were scaled and rough color balanced in Astroart. Central Gradient was removed in Astroart. Channels were co-registered in Astroart. Curves and Levels were applied in Photoshop to optimize object appearance. Final LRGB combine was done in Photoshop using Luminance Layering (or LLRGB). G2V and atmospheric extinction color correction and final touches were done in Photoshop. SGBNR was used to smooth background noise on the final result. Final Image size is approximately 1392x1040.

This image was guided; North is up.  M4 is a relatively close globular cluster in the constellation of Scorpius - it is a distance of about 7,200 light years from Earth. M4 is a "loose" globular cluster in that its' core is not tightly packed with stars. It would be a more spectacular object in our skies if it were not for the interstellar dust that obscures this object. This dust also accounts for the reddish hue of this cluster. The dust obscure shorter blue wavelengths more heavily than the longer red wavelengths. M4 is located about 1.3 degrees West of the bright star Antares
A closer in view of M4 is in the archives here;  Horizontal FOV is 36'

Image Center is approximately - Equatorial 2000: RA: 16h 23m 36s Dec: -2631'29"


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