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Tweedledum Cluster

Captain Hook Cluster, NGC 6633

Proper NamesTweedledum Cluster, Captain Hook Cluster
Messier NumberNone
NGC/IC NumberNGC 6633
ConstellationOphiuchus
Right Ascension18h 27m 31s
Declination+6° 34' 12"
Distancec.1,000 light years
c.300 parsecs
MagnitudeApparent: +4.6
Absolute: -3.3
DiameterApparent: 20'
Actual: 7 light years
Number of Stars38
Optimum VisibilityJuly
Location of NGC 6633

NGC 6633 falls just inside Ophiuchus' border with Serpens. This is a comparatively close star cluster, just 1,000 light years from the Solar System.

A small open star cluster in Ophiuchus, lying about 1,000 light years from the Sun.

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