We present observations of a massive star cluster near the nuclear region of the nearby starburst galaxy NGC 253 .
The peak of near-infrared emission , which is spatially separated by 4 ^ { \prime \prime } from the kinematic center of the galaxy , is coincident with a super star cluster whose properties we examine with low-resolution ( R \sim 1,200 ) infrared CTIO spectroscopy and optical/near-infrared HST imaging .
Extinction , measured from [ Fe ii ] lines , is estimated at A _ { V } = 17.7 \pm 2.6 .
The age of the cluster is estimated at 5.7 Myr , based on Br \gamma equivalent width for an instantaneous burst using Starburst99 modeling .
However , a complex star formation history is inferred from the presence of both recombination emission and photospheric CO absorption .
The ionizing photon flux has a lower limit of 7.3 \pm 2.5 \times 10 ^ { 53 } s ^ { -1 } , corrected for extinction .
Assuming a Kroupa IMF , we estimate a cluster mass of \sim 1.4 ^ { +0.4 } _ { -0.5 } \times 10 ^ { 7 } M _ { \odot } .
We observe a strong Wolf-Rayet signature at 2.06 \mu m and report a weak feature at 2.19 \mu m which may be due to a massive stellar population , consistent with the derived mass and age of this cluster .