NGC 6520 is an open cluster of stars in the southern constellation of Sagittarius,[5] about 4° to the east of the Galactic Center.

[2] Both features are viewed against the dense stary background of the Large Sagittarius Star Cloud.

[1] This is a young open cluster of stars with age estimates yielding a values of 150 to 190 million years.

[3] However, the presence of stars with a spectral class of B4 and B5 suggest a much younger age of 60 million years.

Polarization measurements of the cluster members suggests that there are three closer dust layers partially obscuring the view from the perspective of the Earth.