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The recently discovered gamma-ray binary 1FGL J1018.6-5856 has a proposedoptical/near-infrared (OIR) counterpart 2MASS 10185560-5856459. We presentStromgren photometry of this star to investigate its photometric variabilityand measure the reddening and distance to the system. We find that thegamma-ray binary has E(B-V) = 1.34 +/- 0.04 and d = 5.4^+4.6_-2.1 kpc. WhileE(B-V) is consistent with X-ray observations of the neutral hydrogen columndensity, the distance is somewhat closer than some previous authors havesuggested.

The Distance of the Gamma-ray Binary 1FGL J1018.6-5856