The Distance of the Gamma-ray Binary 1FGL J1018.6-5856
  The recently discovered gamma-ray binary 1FGL J1018.6-5856 has a proposed optical/near-infrared (OIR) counterpart 2MASS 10185560-5856459. We present Stromgren photometry of this star to investigate its photometric variability and measure the reddening and distance to the system. We find that the gamma-ray binary has E(B-V) = 1.34 +/- 0.04 and d = 5.4^+4.6_-2.1 kpc. While E(B-V) is consistent with X-ray observations of the neutral hydrogen column density, the distance is somewhat closer than some previous authors have suggested. 
Vanessa J. Napoli, M. Virginia McSwain, Amber N. Marsh Boyer, and   Rachael M. Roettenbacher
astro-ph.HE astro-ph.SR