M12 (NGC 6218), The Top-Heavy Gumball Globular (Ruben Barbosa)

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

M12 (NGC 6218), The Top-Heavy Gumball Globular, Ruben Barbosa

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M12 (NGC 6218), The Top-Heavy Gumball Globular

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M12 (NGC 6218), The Top-Heavy Gumball Globular

* Image Acquisition by Jim Misti / Steven Mazlin.

* Processing: Ruben Barbosa.

Messier 12 (NGC 6218) is a globular cluster of stars in the constellation of Ophiuchus and was discovered by Frenchman Charles Messier on May 30, 1764.

The system is about 16,000 light-years from Earth and has a diameter of about 75 light-years; Its apparent magnitude is 6.7 and can not be seen with the naked eye. Measurements indicate that it is in radial approximation of the Earth at a speed of 16 km/s.

Because it was not very dense in relation to other clusters, it was classified as being of the open type for some time.

Since globular clusters travel in eccentric elliptical orbits that traverse dense regions of the galactic disk, the stars of smaller mass may be subjected to other gravitational forces that force them to leave the cluster. In this case, it is estimated that M12 has already lost 80% of its stars, ie more than 1,000,000 stars ejected into the halo of our galaxy.

However, estimates indicate that it will remain for another 4.5 billion years, resulting in a ~ 25% shorter existence than denser clusters.

A remarkable feature of this cluster is that many far way galaxies show up in the background. The largest, 2MASX J16470200-0202314, is located just up-left of the cluster in this image.

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