The Australian Desert Fireball Network: a new era for planetary science
The Australian Desert Fireball Network: a new era for planetary science
复制标题
DOI：
10.1080/08120099.2011.595428
复制
发表时间：
2012-03
影响因子：
1.2
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
中科院分区：
文献类型：
--
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
通过伦敦帝国理工学院、捷克共和国翁德杰约夫天文台和西澳大利亚博物馆之间的国际合作，2007年完成了在西澳大利亚纳拉伯地区安装澳大利亚沙漠火球网的工作。目前，该网络是在南半球建立的第一个网络，由四个全天空自主观测台组成，提供火球记录的精确三角测量，以限制大气层前的轨道和陨石在大约200 000平方公里区域内的坠落位置。迄今为止，该网络已成功回收了两次观测到的陨石福尔斯坠落。第一次回收的是2007年7月20日19时13分53.2秒±0.1秒世界时记录的同一陨石坠落的三个碎片（174、150和14.9克），它们是在预测的坠落线100米范围内发现的。这颗陨石被命名为邦布拉岩洞（英语：Rockhole），是一颗玄武质无球粒陨石，其氧同位素组成（Δ 17 O = −0.112 ‰）将其与被认为来自小行星4灶神星的霍华德陨石-绿柱石-闪长岩族的玄武质陨石区分开来，因此它一定来自类地行星区域的另一颗分化小行星。邦布拉洛克霍尔是从一个几乎完全包含在地球轨道内的类似阿滕的轨道上被送到地球的。该网络于2010年4月13日探测到第二次回收的陨石坠落，并回收了一块24.54克的陨石碎片，该碎片尚未得到充分描述。迄今为止，该网络已记录了1550个火球。可以确定精确轨道和弹道的记录有150条。除了两个回收的福尔斯瀑布外，还有12个火球被认为是造成陨石福尔斯瀑布的原因。其中，4个是可能的福尔斯（10 s-100 g），5个是确定的福尔斯（>100 g）。在证明了该网络的潜力之后，最终一个包含轨道的陨石的大型数据集将为解释目前行星科学所缺乏的陨石组成提供空间背景。
Through an international collaboration between Imperial College London, the Ondřejov Observatory in the Czech Republic and the Western Australian Museum, the installation of the Australian Desert Fireball Network in the Nullarbor Region of Western Australia was completed in 2007. Currently, the Network, which is the first to be established in the southern hemisphere, comprises four all-sky autonomous observatories providing precise triangulation of fireball records to constrain pre-atmospheric orbits and fall positions of meteorites over an area of approximately 200 000 km2. To date, the Network has led to the successful recovery of two observed meteorite falls. The first recovery was three fragments (174, 150 and 14.9 g) of the same meteorite fall recorded on 20 July 2007 at 19 h 13 m 53.2 s±0.1 s UT that were found within 100 m of the predicted fall line. Named Bunburra Rockhole, the meteorite is a basaltic achondrite with an oxygen isotopic composition (Δ17O = −0.112 ‰) distinguishing it from basaltic meteorites belonging to the Howardite–Eucrite–Diogenite clan thought to be derived from asteroid 4Vesta, and therefore must have come from another differentiated asteroid in the terrestrial planet region. Bunburra Rockhole was delivered to Earth from an Aten-like orbit that was almost entirely contained within the Earth's orbit. The second recovered fall was detected by the Network on 13 April 2010 and led to the recovery of a 24.54 g meteorite fragment that is yet to be fully described. To date, the Network has recorded ∼550 fireballs. Records from which precise orbits and trajectories can be determined number ∼150. In addition to the two recovered falls twelve fireballs are considered to have resulted in meteorite falls. Of these, four are probable falls (10's–100 g), and five are certain falls (>100 g). Having proved the potential of the Network, ultimately a large dataset of meteorites with orbits will provide the spatial context for the interpretation of meteorite composition that is currently lacking in planetary science.