M12 in Ophiuchus (Pete Bouras)

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: M 12 · NGC 6218

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M12 in Ophiuchus

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M12 in Ophiuchus

This is an LRGB image processed in PI. Seeing was below average first half of the night so I ended up throwing out a good number of subs. Cropped in view to properly frame the cluster. Interesting to see a pair of small galaxies at the 8 o'clock position.

Messier 12 (also designated NGC 6218) is a globular cluster in the constellation of Ophiuchus. It was discovered by Charles Messier on May 30, 1764, who described it as a "nebula without stars". The granular core shows a diameter of 3′ (arcminutes) surrounded by a 10′ halo of stars. The cluster is about 16,400 light-years from Earth and has a spatial diameter of about 75 light-years. The brightest stars of M12 are of 12th magnitude. M10 and M12 are only a few thousand light-years away from each other. With a Shapley-Sawyer rating of IX, it is rather loosely packed for a globular and was once thought to be a tightly concentrated open cluster. Thirteen variable stars have been recorded in this cluster. M12 is approaching us at a velocity of 16 km/s. (wikipedia)

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M12 in Ophiuchus

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