- References
{{Infobox globular cluster
| name = NGC 6539
| image =
| caption = Globular cluster NGC 6539
| epoch = 2000
| class = X:
| constellation = Serpens
| ra = {{RA|18|04|48.0}}
| dec = {{DEC|–07|35|00}}
| dist_ly = {{Convert|25.4|kly|kpc|abbr=on|lk=on}}[2]
| appmag_v = 9.6
| size_v = 7.9'
| mass_msol = {{Val|5.36|e=5}}[2]
| metal_fe = –0.63[2]
| notes =
| names = GCL 85
}}NGC 6539 (also GCL 85) is a globular cluster in the constellation Serpens. It was discovered by Theodor Brorsen in 1856.[1][2]References1. ^Normandin, George. "Globular Star Cluster NGC 6539." Kopernik Space Images. 20 Oct. 2000. 20 June 2008 2. ^Patterson, Bill. "Global CLusters 2007 Gallery." LAAstro. 2007. 20 June 2008 .
3. ^1 2 3 {{citation | display-authors=1 | last1=Boyles | first1=J. | last2=Lorimer | first2=D. R. | last3=Turk | first3=P. J. | last4=Mnatsakanov | first4=R. | last5=Lynch | first5=R. S. | last6=Ransom | first6=S. M. | last7=Freire | first7=P. C. | last8=Belczynski | first8=K. | title=Young Radio Pulsars in Galactic Globular Clusters | journal=The Astrophysical Journal | volume=742 | issue=1 | page=51 |date=November 2011 | doi=10.1088/0004-637X/742/1/51 | bibcode=2011ApJ...742...51B | postscript=. |arxiv = 1108.4402 }}
}} 4 : Globular clusters|Discoveries by Theodor Brorsen|Astronomical objects discovered in 1856|NGC objects |