Hydra Cluster

Not to be confused with Abell 732 (CL0855+0321) or the Hydra–Centaurus Supercluster

The Hydra Cluster (or Abell 1060) is a galaxy cluster that contains 157 bright galaxies, appearing in the constellation Hydra.^[4] The cluster spans about ten million light-years and has an unusually high proportion of dark matter.^[5] The cluster is part of the Hydra–Centaurus Supercluster located 158 million light-years from Earth. The cluster's largest galaxies are elliptical galaxies NGC 3309 and NGC 3311 and the spiral galaxy NGC 3312 all having a diameter of about 150,000 light-years.^[6] In spite of a nearly circular appearance on the sky, there is evidence in the galaxy velocities for a clumpy, three-dimensional distribution.^[7]

A map of Hydra cluster

Hydra Cluster
Central region of Abell 1060 (Hydra Cluster) with legacy surveys. The bright stars are HD 92036 (middle left) and HD 91964 (bottom)
Observation data (Epoch J2000)
Constellation(s)	Hydra
Right ascension	09h 18.0m [1]
Declination	−12° 05′[1]
Number of galaxies	157[2]
Richness class	1[3]
Bautz–Morgan classification	III[3]
Redshift	0.0548 (16,452 km/s)[1]
Distance	58.3 Mpc (190.1 Mly) h−1 0.705
X-ray flux	6.1×10−11 erg s−1 cm−2 (0.5–2 keV)[1]
Other designations
Abell 1060