Saturday, November 14, 2015

Messier 12: A globular star cluster in Ophiuchus

Image: Messier 12

An impressive globular star cluster can be discovered in the Ophiuchus constellation. It has a brightness of 6.7mag and an apparent size of 17.6' in the summer firmament. The light of its stars travelled 16000 years to reach our planet.

This star cluster has a diameter of approx. 80 light years. It has a radial velocity of 42 km/s and a color index of 0.84 (i.e. yellow color). A faint galaxy pair is visible at 02:00. The brightest galaxy of this pair is the PGC1103219.
References: Wikipedia

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