Saturday, November 21, 2015
Saturday, November 14, 2015
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.