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Title: Optical properties of (162173) 1999 JU3: in preparation for the JAXA Hayabusa 2 sample return mission

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 H {sub V} = 19.25 ± 0.03. The phase slope (0.039 ± 0.001 mag deg{sup –1}) and opposition effect amplitude (parameterized by the ratio of intensity at α = 0.°3 to that at α = 5°, I(0.°3)/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, B {sub 0} = 1.43, and h =more » 0.050, assuming a surface roughness parameter θ-bar = 20°. By combining our photometric study with a thermal model of the asteroid, we obtained a geometric albedo of p {sub v} = 0.047 ± 0.003, phase integral q = 0.32 ± 0.03, and Bond albedo A {sub B} = 0.014 ± 0.002, which are commensurate with the values for common C-type asteroids.« less
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ; ; ;  [9] ;  [10] ;  [11] ; ;  [12] ;  [13] ;  [14] ;  [15] more »; « less
  1. Department of Physics and Astronomy, Seoul National University, Gwanak, Seoul 151-742 (Korea, Republic of)
  2. Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232 (Japan)
  3. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 252-5210 (Japan)
  4. Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749 (Korea, Republic of)
  5. Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 305-348 (Korea, Republic of)
  6. Lowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001 (United States)
  7. Department of Aerospace Engineering, Nihon University, 7-24-1 Narashinodai Funabashi, Chiba 274-8501 (Japan)
  8. Institute of Astronomy, National Central University, 300 Jhongda Road, Jhongli, Taoyuan 32001, Taiwan (China)
  9. Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, Sayo, Hyogo 679-5313 (Japan)
  10. Sayo Town Office, 2611-1 Sayo, Sayo-cho, Sayo, Hyogo 679-5380 (Japan)
  11. Academia Sinica Institute of Astronomy and Astrophysics, Roosevelt Road, Taipei 10617, Taiwan (China)
  12. The Observatories of the Carnegie Institute of Washington, Las Campanas Observatory, Colina El Pino, Casilla 601, La Serena (Chile)
  13. Bisei Spaceguard Center, Japan Spaceguard Association, 1716-3 Okura, Bisei-cho, Ibara, Okayama 714-1411 (Japan)
  14. Ishigakijima Astronomical Observatory, National Astronomical Observatory of Japan, 1024-1 Arakawa, Ishigaki, Okinawa 907-0024 (Japan)
  15. Department of Teacher Training, Hokkaido University of Education, 9 Hokumon, Asahikawa 070-8621 (Japan)
Publication Date:
OSTI Identifier:
22365176
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 792; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALBEDO; AMPLITUDES; ASTEROIDS; ASTROPHYSICS; MAPS; METEORITES; METEOROIDS; NONLINEAR PROBLEMS; OPTICAL PROPERTIES; PLANETS; ROUGHNESS; SURFACES