Norma cluster

Norma Cluster
Centre of the cluster with Milky Way stars in the foreground. Giant galaxies ESO 137-8 and ESO 137-6 are visible to the left.
Observation data (Epoch J2000)
Constellation(s)	Norma, Triangulum Australe
Right ascension	16h 15m 32.8s
Declination	−60° 54′ 30″
Richness class	1
Bautz-Morgan classification	I
Redshift	0.01570 (4 707 km/s)
Distance (co-moving)	67.8 Mpc (221.1 Mly) h−1 0.705
Binding mass	1015 M☉
X-ray flux	10 mCrab
Other designations
Abell 3627
See also: Galaxy groups, Galaxy clusters, List of galaxy clusters

The Norma Cluster (ACO 3627 or Abell 3627) is a rich cluster of galaxies located near the center of the Great Attractor; it is about 68 Mpc (222 Mly) distant. Although it is both nearby and bright, it is difficult to observe because it is located in the Zone of Avoidance, a region near the plane of the Milky Way. Consequently, the cluster is severely obscured by interstellar dust at optical wavelengths. Its mass is estimated to be on the order of 10¹⁵solar masses.

Coordinates: 16^h 15^m 32.8^s, −60° 54′ 30″

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