Antipodal velocity for laboratory impact experiments on porous targets.

• Project/Area Number: 22740300
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: Fukushima National College of Technology
• Principal Investigator: MICHIKAMI Tatsuhiro 福島工業高等専門学校, 一般教科, 准教授 (60369931)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 惑星起源 / 進化 / 惑星探査 / 惑星起源、進化 / 宇宙科学 / 岩石・鉱物・鉱床学

Research Abstract

The surface of asteroid 25143 Itokawa is covered with numerous boulders although gravity is very small compared with that of other asteroids previously observed from spacecraft. The bulk porosiy of Itokawa is～ 40%, which is larger than that of asteroid Eros. Impact experiments on porous targets were carried out, in order to investigate the relationship between the ejecta velocity and the porosity of the target on catastrophic disruption. The result shows that antipodal velocity is mainly dependent on the shock pressure attenuation of the target, and not so greatly on the porosity.

Research Products

• [Journal Article] Three-dimensional Structure of Hayabusa Samples : Origin and Evolution of Itokawa Regolith (2011)
  • Author(s): Isuchiyama A., Uesugi M.Matsushina T., …, Katagiri J.
  • Journal Title: Science Volume: 333 Issue: 6046 Pages: 1125-1128
  • DOI: 10.1126/science.1207807
  • Peer Reviewed
• [Journal Article] The shape distribution of boulders on asteroid 25143Itokawa : Comparison with fragments from impact experiments (2011)
  • Author(s): T.Michikami, A.M.Nakamura, N.Hirata
  • Journal Title: Icarus. Volume: 207 Pages: 277-284
  • Peer Reviewed
• [Journal Article] Three dimensional Structure of HayabusaSamples : Origin and Evolution of Itokawa Regolith (2010)
  • Author(s): A. Tsuchiyama1, M. Uesugi, T. Matsushima, T. Michikami, T. Kadono, T. Nakamura, K. Uesugi, T. Nakano, S. A. Sandford, R. Noguchi, T. Matsumoto, J. Matsuno, T. Nagano, Y. Imai, A. Takeuchi, Y. Suzuki, T. Ogami, J. Katagiri, M. Ebihara, T. R. Ireland, F. Ki
  • Journal Title: Science Volume: 333 Pages: 1125-1128
  • Peer Reviewed
• [Journal Article] The shape distribution of boulders on asteroid 25143Itokawa : Comparison with fragments from impact experiments (2010)
  • Author(s): T. Michikami, A. M. Nakamura, N. Hirat-a
  • Journal Title: Icarus Volume: 207 Pages: 277-284
  • Peer Reviewed
• [Presentation] 衝突破片の形状分布と天体表面の粒子の形状 (2012)
  • Author(s): 道上達広
  • Organizer: 平成23年度スペース・プラズマ研究会
  • Place of Presentation: JAXA宇宙科学研究所
• [Presentation] 弾丸・標的のサイズ比と衝突破片速度の測定 (2011)
  • Author(s): 道上達広
  • Organizer: 第7回天体の衝突物理の解明
  • Place of Presentation: 北海道大学低温科学研究所
• [Presentation] 脆性体の破片形状分布とモデル計算 (2011)
  • Author(s): 道上達広、城野信一
  • Organizer: 地球惑星科学関連学会2011年合同大会
  • Place of Presentation: 幕張メッセ
• [Presentation] 月、火星の縦穴と模擬形成実験 (2011)
  • Author(s): 道上達広
  • Organizer: 平成22年度スペース・プラズマ研究会
  • Place of Presentation: JAXA宇宙科学研究所
• [Presentation] 衝突破片の形状と数値モデル (2010)
  • Author(s): 道上達広、城野信一
  • Organizer: 日本惑星学会2010年秋季講演会
  • Place of Presentation: 名古屋大学
• [Presentation] The shape distribution of fragments in dynamic fragmentation : Geometric approach (2010)
  • Author(s): T. Michikami, S. Sirono
  • Organizer: B04-0091-10 COSPAR 2010
  • Place of Presentation: Bremen, Germany(poster presentation)
• [Presentation] The shape distribution of fragments in dynamic fragmentation : Geometric approach (2010)
  • Author(s): T.Michikami
  • Organizer: COSPAR 2010
  • Place of Presentation: Bremen, Germany