Double Cluster

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This image was taken by Rawastrodata with a Nikon D300 on an 8" Newtonian reflector.

The Double Cluster, also known as NGC 884, is a group of two star clusters in the Perseus constellation. It contains many blue and red stars.


RS Persei and T Persei

These are two red supergiant stars in the star cluster. They are 770 and 510 times larger than the Sun respectively.[1]

SU Persei and AV Persei

These are also red supergiant stars. They both are 780 and 770 times larger than the Sun respectively.[2]

S Persei

A red hypergiant 1,212 times larger than the Sun.[3]


  3. Thompson, R. R.; Creech-Eakman, M. J. (2003). "Interferometric observations of the supergiant S Persei: Evidence for axial symmetry and the warm molecular layer". American Astronomical Society Meeting 203 203: 49.07.
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