Celestial hemisphere:  Northern  ·  Constellation: Perseus (Per)  ·  Contains:  10 Per  ·  7 Per)  ·  7 chi Per  ·  8 Per  ·  Double Cluster  ·  HD13659  ·  HD13716  ·  HD13758  ·  HD13784  ·  HD13831  ·  HD13841  ·  HD13854  ·  HD13866  ·  HD13881  ·  HD13890  ·  HD13900  ·  HD13910  ·  HD13929  ·  HD13969  ·  HD13970  ·  HD14012  ·  HD14013  ·  HD14014  ·  HD14026  ·  HD14039  ·  HD14051  ·  HD14052  ·  HD14053  ·  HD14092  ·  HD14093  ·  And 50 more.
Double Cluster NGC-869 & NGC-884, Shane
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Double Cluster NGC-869 & NGC-884

Double Cluster NGC-869 & NGC-884, Shane
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Double Cluster NGC-869 & NGC-884

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Description

The Double Cluster is the nickname for two bright open clusters, NGC 884 and NGC 869, located in the Perseus constellation. They are 7,600 and 6,800 light years distant respectively and relatively close to each other in space. Their respective ages are estimated at 3.2 and 5.6 million years, which means that they are relatively young.
The Double Cluster has a combined apparent magnitude of 4.3 and can be seen without binoculars, but observing each cluster individually requires a telescope. NGC 869 lies to the west and has a visual magnitude of 5.3, and NGC 884 is to the east and has a magnitude of 6.1.
Each cluster contains more than 300 supergiant stars. The hottest main sequence stars in the clusters belong to the spectral class B0. Both clusters are moving toward us, NGC 884 at a speed of 21 km/s, and NGC 869 at 22 km/s.
In mythology, The Double Cluster represents the jeweled handle of Perseus’ sword.

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Double Cluster NGC-869 & NGC-884, Shane