研究生: |
黃雅惠 Huang, Ya-Huei |
---|---|
論文名稱: |
小行星族群成員速度與其直徑關係的研究 The Velocity-Size Relation for Members of Asteroid Families |
指導教授: |
江瑛貴
Jiang, Ing-Guey |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 51 |
中文關鍵詞: | 小行星族群 、撞擊事件 、灶神族群 、Mercury6 軌道軟體 |
外文關鍵詞: | Asteroid family, Impact event, Vesta family, Mercury6 orbital software |
相關次數: | 點閱:57 下載:0 |
分享至: |
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
小行星族群的形成主要是因為,母體經過不知名的猛烈撞擊後,造成母體表面甚至內部碎裂,有大量的碎片帶著可觀的速度脫離母體的重力束縛。而這些當初逃脫母體表面的射出速度可能與其碎片大小有關。因此我們利用現在小行星的反照率與其速度位置的觀測資料再加上一些理論的模型假設,去探討隱藏在現在小行星族群分佈的原始射出速度與碎片直徑大小的關係。我們提出了三個模型,分別是Takagi
模型,Nakamura 一次撞擊模型與Nakamura 二次撞擊模型。在灶神族群中,我們發現,Takagi 模型的結果與觀測資料的結果較符合,這意味著,對於高撞擊速度的撞擊事件,可能不存在明顯的碎片的射出速度與直徑的關係式,或者是絕大部分成員的產生,可能源自於碰撞頻繁時期的低撞擊速度的撞擊事件。
Asteroid families are thought to be formed through collisional events that a catastrophic impact kicks on the parent body and produces many fragments ejected away. The ejection-velocities of these fragments might be related with their sizes. Through the observed and theoretically produced velocities of asteroids, we study the original ejection-velocities of fragments, and investigate the implied vleocity-size relation of asteroid families. Three models were proposed, Takagi model, Nakamura one-impact model and Nakamura two-impact model separately. In Vesta family, we found that maybe it didn't exist the velocity-size relation or most members were produced from low impact-velocity events of the collisional era.
Asphaug, E., 1997, Impact origin of the Vesta family. Meteoritics and Planetary Science 32, 965-980.
Baer, J. and Chesley, S. R., 2008, Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris. Celestial Mechanics and Dynamical Astronomy 100, 27-42.
Cellino, A., Michel, P., Tanga, P., Zappal`a, V., Paolicchi, P. and dell’Oro, A.,1999, The Velocity-Size Relationship for Members of Asteroid Families and
Implications for the Physics of Catastrophic Collisions. Icarus 141, 79-95.
Chambers, J. E. and Migliorini, F., 1997, Mercury - A New Software Package for Orbital Integrations. Bull. American Astron. Soc. 29, 1024.
Di Martino, M., Martelli, G., Smith, P. N. and Woodward, A., 1990, Time evolution and dust production in catastrophic fragmentation by hypervelocity impacts. Icarus 83, 126-32.
Giblin, I., 1998, New data on the velocity-mass relation in catastrophic disruption. Planetary and Space Science, 46, 921-928.
Giblin, I., Martelli, G., Farinella, P., Paolicchi, P., Di Martino, M. and Smith, P. N., 1998, The Properties of Fragments from Catastrophic Disruption Events. Icarus, 134, 77-112.
Hirayama, K., 1918, Groups of asteroids probably of common origin. Astronomical Journal, 31, 185-188.
Murray, C. D. and Dermott, S. F., 1999, Solar System Dynamics. Uni-versity of Cambridge Press.
Nakamura, A. M. and Fujiwara, A., 1991, Velocity distribution of fragments formed in a simulated collisional disruption. Icarus 132, 132-146.
Nesvorn´y, D., Bottke, W. F., Dones, L. and Levison, H. F., 2002, The recent breakup of an asteroid in the main-belt region. Nature 417, 720-771.
Paolicchi, P., Cellino, A., Farinella, P. and Zappal`a, V., 1989, A semiempirical model of catastrophic breakup processes. Icarus 77, 187-212.
Paolicchi, P., Verlicchi, A. and Cellino, A., 1993, Catastrophic fragmentation and formation of families: Preliminary results from a new numerical model.
Celestial Mechanics and Dynamical Astronomy 57, 49-56.
Paolicchi, P., Verlicchi, A. and Cellino, A., 1996, An Improved Semi-Empirical Model of Catastrophic Impact Processes. I: Theory and Laboratory Experiments. Icarus 121, 126-157.
Ryan, E. V., 2000, Asteroid Fragmentation and Evolution of Asteroids. Annual Review of Earth And Planetary Sciences, 28, 367-389.
Takagi, Y., Kato, M. and Mizutani, H., 1992, Velocity distribution of fragments of catastrophic impacts. In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991, 597-600.
Takagi, Y., Nakamura, A. M. and Fujiwara, A., 1996, Fragment Velocity Dependence on Fragment Mass of Impact Fragmentation Phenomena. Lunar and Planetary Science, 27, 1301-1302.
Tedesco, E.F., Cellino, A. and Zappal`a, V., 2005, The Statistical Aster-oid Model: I. The Main-Belt Population for Diameters Greater than 1 km. Astronomical Journal, 129, 2869-2886.
Vickery, A. M., 1987, Variation in ejecta size with ejection velocity. Geophysical Research Letter 14, 726-729.
Zappal`a, V., Bendjoya, Ph., Cellino, A., Farinella, P. and Froeschle, C.,1995, Asteroid families: Search of a 12,487-asteroid sample using two different clustering techniques. Icarus 116, 291-314.
Zappal`a, V., Cellino, A., dell’Oro, A., Migliorini, F. and Paolicchi, P.,1996, Reconstructing the Original Ejection Velocity Fields of Asteroid Families. Icarus 124, 156-180.