Best of AOP - Star Clusters


Messier 7, or the Ptolmey Cluster, can easily be found in the constellation Scorpius with the naked eye under dark skies. It makes a great binocular and telescope object. Open clusters that we view are generally much closer than globular clusters. Rather than being tens of thousands of lightyears away, this cluster is only 980 lightyears distant and 25 lightyears across.

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Last Updated: 24-Jun-2014

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About This Image

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76mm Televue (480mm f/6.3 with 0.8x Field Corrector) 

SBIG ST10XME CCD camera with color filter wheel

LRGB color production was used to create this image.

Luminance = RGB (synthetic) binned 1x1

Red = 10 minutes binned 1x1

Green = 20 minutes binned 1x1

Blue = 20 minutes binned 1x1

Minimum credit line: Allan Cook/Adam Block/NOAO/AURA/NSF