NGC 6166

NGC 6166
Galaxy NGC 6166
Observation data (J2000 epoch)
Constellation	Hercules
Right ascension	16h 28m 38.276s
Declination	+39° 33′ 04.97″
Redshift	z = −0.030354 (minus sign indicates blueshift)
Helio radial velocity	−9100 km/s
Distance	490 Mly (142 mpc)
Apparent magnitude (V)	12.78
Absolute magnitude (V)	−24.1
Characteristics
Type	cD2 pec.
Apparent size (V)	1.9’ x 1.4’
Other designations
UGC 10409 CGCG 2205.6+3107 0504 MCG +07 -34-060 058 265 338
See also: Galaxy, List of galaxies

Coordinates: 16^h 28^m 38.276^s, +39° 33′ 04.97″

NGC 6166 is an elliptical galaxy in the Abell 2199 cluster. It lies 490 million light years away in the constellation Hercules. The primary galaxy in the cluster, it is one of the most luminous galaxies known in terms of X-ray emissions.

NGC 6166 is a supermassive, type cD galaxy, with several smaller galaxies within its envelope.

Suspected to have formed through a number of galaxy collisions, NGC 6166 has a large number of globular clusters (estimated as between 6,200 and 22,000 in 1996) orbiting the galaxy. A 2016 study, however, gave an even higher number (around 39,000) suggesting also that the halo of this galaxy blends smoothly with the intra-cluster medium

The galaxy harbors a supermassive black hole at its center with a mass of nearly 30 billion ${\displaystyle {\begin{smallmatrix}M_{\odot }\end{smallmatrix}}}$ based on dynamical modelling.

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