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OPTICAL PROPERTIES OF (162173) 1999 JU3: IN PREPARATION FOR THE JAXA HAYABUSA 2 SAMPLE RETURN MISSION

2014; IOP Publishing; Volume: 792; Issue: 1 Linguagem: Inglês

10.1088/0004-637x/792/1/74

1538-4357

Masateru Ishiguro, D. Kuroda, Sunao Hasegawa, Myung-Jin Kim, Young‐Jun Choi, Nicholas Moskovitz, Shinsuke Abe, Kang-Sian Pan, Jun Takahashi, Y. Takagi, Akira Arai, Noritaka Tokimasa, Henry H. Hsieh, J. E. Thomas-Osip, D. J. Osip, Masanao Abe, Makoto Yoshikawa, Seitaro Urakawa, H. Hanayama, Tomohiko Sekiguchi, K. Wada, T. Sumi, P. J. Tristram, Kei Furusawa, Fumio Abe, Akihiko Fukui, Takahiro Nagayama, Dhanraj S. Warjurkar, A. Rau, J. Greiner, P. Schady, F. Knust, Fumihiko Usui, Thomas Müller,

Stellar, planetary, and galactic studies

We investigated the magnitude–phase relation of (162173) 1999 JU3, a target asteroid for the JAXA Hayabusa 2 sample return mission. We initially employed the International Astronomical Union's H–G formalism but found that it fits less well using a single set of parameters. To improve the inadequate fit, we employed two photometric functions: the Shevchenko and Hapke functions. With the Shevchenko function, we found that the magnitude–phase relation exhibits linear behavior in a wide phase angle range (α = 5°–75°) and shows weak nonlinear opposition brightening at α < 5°, providing a more reliable absolute magnitude of HV = 19.25 ± 0.03. The phase slope (0.039 ± 0.001 mag deg−1) and opposition effect amplitude (parameterized by the ratio of intensity at α = 03 to that at α = 5°, I(03)/I(5°) = 1.31 ± 0.05) are consistent with those of typical C-type asteroids. We also attempted to determine the parameters for the Hapke model, which are applicable for constructing the surface reflectance map with the Hayabusa 2 onboard cameras. Although we could not constrain the full set of Hapke parameters, we obtained possible values, w = 0.041, g = −0.38, B0 = 1.43, and h = 0.050, assuming a surface roughness parameter = 20°. By combining our photometric study with a thermal model of the asteroid, we obtained a geometric albedo of pv = 0.047 ± 0.003, phase integral q = 0.32 ± 0.03, and Bond albedo AB = 0.014 ± 0.002, which are commensurate with the values for common C-type asteroids.