Model constructIon of Surface of asteroId 1996SF36 to be explored by MUSES-C

2003 Fiscal Year Final Research Report Summary

• Project/Area Number: 14340135
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 固体地球物理学
• Research Institution: Japan Aerospace Exploration Agency
• Principal Investigator: FUJIWARA Akira JAXA, ISAS, PROFESSOR, 宇宙科学研究本部固体惑星科学研究系, 教授 (70173482)
• Co-Investigator(Kenkyū-buntansha): ABE Masanao JAXA, ISAS, RESEARCH ASSOCIATE, 宇宙科学研究本部固体惑星科学研究系, 助手 (00270439) ; YANO Hajime JAXA, ISAS, RESEARCH ASSOCIATE, 宇宙科学研究本部固体惑星科学研究系, 助手 (00321571)
• Project Period (FY): 2002 – 2003
• Keywords: ASTEROID / SAMPLE RETURN / NEAR EARTH / PLANETARY MISSION / SURFAE / REGOLITH / OBSERVATION / HYPERVELOCITY IMPACT

Research Abstract

Following researches were conducted for anticipating the surface of an asteroid Itokawa (25143 SF36), the target of the Hayabusa (MUSES-C)mission.
(1)The properties of the asteroid were reduced based on the results obtained in the opportunity for ground based observation in 2001. Following results were found from light curves of the asteroid; the rotational period is 12.13h that is longer than the average value of average asteroids, the spin axis is near the perpendicular to the ecliptic, the rotation is retrograde, and the shape is irregular. From spectroscopic observation in the optical to thermal infrared region the spectroscopic type of the asteroid was found to be S-type and the meteorite analog was found to be ordinary chondrite. The spectroscopic data at 3 micron band suggest that almost no hydrated minerals exist on the asteroid surface (less than 1%). Using the multiband spectroscopic data in the visible wavelength at various phase angles, the light scattering properties (Hapke parameters) of the asteroid surface material were investigated, and it was found that the material has the strong forward scattering property. Thermal infrared data provides the reflectivity and the surface temperature of the asteroid. These data suggest that the thermal inertia of the surface material is larger than the average asteroids. The reflectivity is higher than the average S-type asteroids.
(2)Craters were produced on gypsum targets by the oblique impact of projectiles of 4km/sec. The velocity distribution of the fragments ejected by the impact were investigated. As the result a small number of fragments of velocity less than 1m/s Is ejected. Since these fragment velocities are less than the escape velocity of the Itokawa, these fragments will fall back to and accumulate on the Itokawa and form the regolith layer.

Research Products

• [Journal Article] Mass - velocity distributions of fragments in oblique impact cratering on gypsum (2004)
  • Author(s): N.Onose, A.Fujiwara
  • Journal Title: Meteoritics & Planetary Science 39 Pages: 321-331
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Characteristics and current status of near infrared spectrometer for Hayabusa mission (2004)
  • Author(s): Abe M., Takagi Y., Abe S., Kitazato K., Hiroi T., Ueda Y., Vilas F., Clark B.E., Fujiwara A.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) CD-ROM
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Sampling strategy and curation plan of "Hayabusa" asteroid sample return mission (2004)
  • Author(s): Yano H., Fujiwara A., Abe M., Hasegawa S., Kushiro I., Zolensky M.E.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) CD-ROM
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Charactarization of the surface properties of MUSES-C/Hayabusa spacecraft target asteroid 25143 Itokawa (1998 SF36) (2004)
  • Author(s): Lederer S.M., Domingue D.L., Vilas F., Abe M., Farnham T.L., Jarvis K.S., Lowry S.C., Ohba Y., Weissman P.R., French L.M., Fukai H., Hasegawa S., Ishiguro M., Larson S.M., Takagi Y.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) CD-ROM
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Sample return science by Hayabusa near- earth-asteroid mission (2004)
  • Author(s): Fujiwara A., Abe M., Kato M., Kushiro I., Mukai T., Okada T., Saito J., Sasaki S., Yano H., Yeomans D.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) CD-ROM
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Characteristics and current status of near infrared spectrometer for Hayabusa mission (2004)
  • Author(s): Abe M., Takagi Y., Abe S., Kitazato K., Hiroi T., Ueda Y., Vilas F., Clark B.E., Fujiwara A.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) (CD-ROM)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Sampling strategy and curation plan of "Hayabusa" asteroid sample return mission (2004)
  • Author(s): Yano H., Fujiwara A., Abe M., Hasegawa S., Kushiro I., Zolensky M.E.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) (CD-ROM)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Charactarization of the surface properties of MUSES-C/Hayabusa spacecraft target asteroid 25143 Itokawa (1998 SF36) (2004)
  • Author(s): Lederer S.M., Domingue D.L., Vilas F., Abe M., Farnham T.L., Jarvis K.S., Lowry S.C., Ohba Y., Weissman P.R., French L.M., Fukai H., Hasegawa S., Ishiguro M., Larson S., M., Takagi Y.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) (CD-ROM)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Sample return science by Hayabusa near-earth-asteroid mission (2004)
  • Author(s): Fujiwara A., Abe M., Kato M., Kushiro I., Mukai T., Okada T., Saito J., Sasaki S., Yano H., Yeomans D.
  • Journal Title: 35th Lunar and planetary Science Conference (Huston) (CD-ROM)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Near-infrared observations of (25143) 1998SF36 (2003)
  • Author(s): Ishiguro M., Abe M., Ohba Y., Fujiwara A., Fuse T., Terada H., Goto M., Kobayashi N., Tokunaga A.T., Hasegawa S.
  • Journal Title: Publication of Astronomical Society of Japan 55 Pages: 691-699
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Pole orientation and triaxial ellipsoid shape of (25143) 1998 SF36, a target asteroid of the MUSES-C mission (2003)
  • Author(s): Ohba Y., Abe M., Hasegawa S., Ishiguro M., Kwiatkowski T., Colas F., Dermawan B., Fujiwara A.
  • Journal Title: Earth Planet.Space 55 Pages: 341-347
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] CCD photometry and model of MUSES-C target (25143) 1998 SF36 (2003)
  • Author(s): M.Kaasalainen, T.Kwiatkowski, M.Abe, J.Piironen, T.Nakamura, Y.Ohba, B.Dermawan, T.Farnham, F.Colas, S.Lowry, P.Weissman, R.J.Whiteley, D.J.Tholen, S.M.Larson, M.Yoshikawa, I.Toth, F.P.Velichko
  • Journal Title: Astron.Astrophys. 405 Pages: L29-L32
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Surface properties of Hayabusa (MUSES-C) spacecraft target 1998 SF36 (25143) (2003)
  • Author(s): Lederer S.M., Domingue D.L., Vilas F., Abe M., Farnham T., French L.M., Ishiguro M., Jarvis K.S., Larson S.M., Lowry S., Massey P., Ohba Y., Takagi Y., Weissman P.
  • Journal Title: 2003 DPS meeting CD-ROM
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Near-infrared observations of (25143) 1998SF36 (2003)
  • Author(s): Ishiguro M., Abe M., Ohba Y.Fujiwara A., Fuse T., Terada H., Goto M., Kobayashi N., Tokunaga A.T., Hasegawa S.
  • Journal Title: Publication of Astronomical Society of Japan 22,55 Pages: 691-699
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Pole orientation and triaxial ellipsoid shape of (25143) 1998 SF36, a target asteroid of the MUSES-C mission (2003)
  • Author(s): Ohba Y., Abe M., Hasegawa S., Ishiguro M., Kwiatkowski T., Colas F., Dermawan B, Fujiwara A.
  • Journal Title: Earth Planet.Space 55 Pages: 341-347
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] CCD photometry and model of MUSES-C target (25143) 1998 SF36 (2003)
  • Author(s): M.Kaasalainen, T.Kwiatkowski, M.Abe, J.Piironen, T.Nakamura, Y.Ohba, B.Dermawan, T.Farnham, F.Colas, S.Lowry, P.Weissman, R.J.Whiteley, D.J.Tholen, S.M., Larson, M.Yoshikawa, I.Toth, F.P.Velichko
  • Journal Title: Astron.Astrophys 405 Pages: 29-32
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Surface properties of Hayabusa (MUSES-C) spacecraft target 1998 SF36 (25143) (2003)
  • Author(s): Lederer S.M., Domingue D.L., Vilas F., Abe M., Farnham T., French L.M., Ishiguro M., Jarvis K.S., Larson S., M., Lowry S., Massey P., Ohba Y., Takagi Y., Weissman P.
  • Journal Title: 2003 DPS meeting (CD-ROM)
  • Description: 「研究成果報告書概要(欧文)」より