The Bunburra Rockhole meteorite fall in SW Australia: fireball trajectory, luminosity, dynamics, orbit, and impact position from photographic and photoelectric records
The Bunburra Rockhole meteorite fall in SW Australia: fireball trajectory, luminosity, dynamics, orbit, and impact position from photographic and photoelectric records
复制标题
澳大利亚西南部的班布拉岩洞陨石坠落：来自照相和光电记录的火球轨迹、光度、动力学、轨道和撞击位置
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
G. Deacon
中科院分区：
文献类型：
--
作者：
P. Spurný;P. Bland;L. Shrbený;J. Borovička;Z. Ceplecha;A. Singelton;A. Bevan;D. Vaughan;M. Towner;Terence P. McClafferty;R. Toumi;G. Deacon
摘要：我们报告了对2007年7月20日澳大利亚第一次仪器观测到的陨石坠落的分析，这是由沙漠火球网络（DFN）的两个东部站点通过摄影和光电记录的。这颗初始质量为22千克的流星体以13.36 km s - 1的低速进入大气层，并在62.83 km的高度开始了发光轨道。在最大的时候，它达到了- 9.6级的绝对星等，并在29.59公里的高度以5.8公里的速度飞行了5.7秒和64.7公里后结束。大气轨道与地球表面的夹角为30.9°。第一次有组织的搜索于2008年10月进行，在搜索的第一天（2008年10月3日）结束时，在预测中心线向南97米处发现了第一颗陨石（150克）。第二块石头（174克）在中线向北39米处被发现，两者都完全符合预测的质量限制。在2009年2月的第二次探险中，第三块14.9克的碎片再次被发现，距离预测位置非常近（约100米）。总回收质量为339g。这颗陨石被命名为本布拉岩洞（Bunburra Rockhole，简称BR）。第一个DFN样品为火成岩无球粒陨石。最初的岩石学表明BR是角砾岩，但详细分析表明BR不是典型的角砾岩，而是一种异常的玄武岩陨石（Bland et al. 2009）。BR是从一个不寻常的阿吞型轨道（小于1天文单位）发射的，几乎整个轨道都包含在地球轨道内。BR是第一个有已知轨道的无球粒陨石，它是迄今为止计算出的最精确的火球陨石轨道之一。
Abstract– We report an analysis of the first instrumentally observed meteorite fall in Australia, which was recorded photographically and photoelectrically by two eastern stations of the Desert Fireball Network (DFN) on July 20, 2007. The meteoroid with an initial mass of 22 kg entered the atmosphere with a low speed of 13.36 km s−1 and began a luminous trajectory at an altitude of 62.83 km. In maximum, it reached −9.6 absolute magnitude and terminated after a 5.7 s and 64.7 km long flight at an altitude of 29.59 km with a speed of 5.8 km s−1. The angle of the atmospheric trajectory to the Earth’s surface was 30.9°. The first organized search took place in October 2008 and the first meteorite (150 g) was found 97 m southward from the predicted central line at the end of the first day of searching (October 3, 2008). The second stone (174 g) was recovered 39 m northward from the central line, both exactly in the predicted mass limits. During the second expedition in February 2009, a third fragment of 14.9 g was found again very close (∼100 m) from the predicted position. Total recovered mass is 339 g. The meteorite was designated Bunburra Rockhole (BR) after a nearby landscape structure. This first DFN sample is an igneous achondrite. Initial petrography indicated that BR was a brecciated eucrite but detailed analyses proved that BR is not a typical eucrite, but an anomalous basaltic meteorite ( Bland et al. 2009 ). BR was delivered from an unusual, Aten type orbit (a < 1 AU) where virtually the entire orbit was contained within Earth’s orbit. BR is the first achondrite fall with a known orbit and it is one of the most precise orbits ever calculated for a meteorite dropping fireball.
影响因子：
1.2
作者：
P. Bland;P. Spurný;A. Bevan;K. Howard;M. Towner;G. Benedix;R. Greenwood;L. Shrbený;I. Franchi;G. Deacon;J. Borovička;Z. Ceplecha;D. Vaughan;R. Hough
通讯作者：
P. Bland;P. Spurný;A. Bevan;K. Howard;M. Towner;G. Benedix;R. Greenwood;L. Shrbený;I. Franchi;G. Deacon;J. Borovička;Z. Ceplecha;D. Vaughan;R. Hough