| NGC6539 / Globular Cluster, type X: |
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| R.A. | 18h 04m 49.8s (2000.0) |
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| Dec. | -07°35' 09" (2000.0) |
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| Apparent Size | 7.9' |
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| Real Size | 60 light yrs. |
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| Magnitude | 8.9 |
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| Distance | 25,400 light yrs. |
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Located on the almost boundary line with the constellation Ophiuchus, a small globular cluster belonging to the constellation Serpens Cauda is NGC 6539.
It can be found 2.6 degrees northeast of the star ν Oph.
With an apparent diameter of about 8 arc minutes and a brightness of 9th magnitude, its constituent stars are quite sparsely clustered.
Its distance from the solar system is estimated to be 25,000 light years.
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