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We investigated the magnitude-phase relation of (162173) 1999 JU3, a targetasteroid for the JAXA Hayabusa 2 sample return mission. We initially employedthe international Astronomical Union's H-G formalism but found that it fitsless well using a single set of parameters. To improve the inadequate fit, weemployed two photometric functions, the Shevchenko and Hapke functions. Withthe Shevchenko function, we found that the magnitude-phase relation exhibitslinear behavior in a wide phase angle range (alpha = 5-75 deg) and shows weaknonlinear opposition brightening at alpha< 5 deg, providing a more reliableabsolute magnitude of Hv = 19.25 +- 0.03. The phase slope (0.039 +- 0.001mag/deg) and opposition effect amplitude (parameterized by the ratio ofintensity at alpha=0.3 deg to that at alpha=5 deg, I(0.3)/I(5)=1.31+-0.05) areconsistent with those of typical C-type asteroids. We also attempted todetermine the parameters for the Hapke model, which are applicable forconstructing the surface reflectance map with the Hayabusa 2 onboard cameras.Although we could not constrain the full set of Hapke parameters, we obtainedpossible values, w=0.041, g=-0.38, B0=1.43, and h=0.050, assuming a surfaceroughness parameter theta=20 deg. By combining our photometric study with athermal model of the asteroid (Mueller et al. in preparation), we obtained ageometric albedo of pv = 0.047 +- 0.003, phase integral q = 0.32 +- 0.03, andBond albedo AB = 0.014 +- 0.002, which are commensurate with the values forcommon C-type asteroids.

Optical Properties of (162173) 1999 JU3: In Preparation for the JAXA Hayabusa 2 Sample Return Mission