SMART-1 end of life shallow regolith impact simulations
SMART-1 end of life shallow regolith impact simulations
复制标题
SMART-1 寿命终止浅表层撞击模拟
DOI：
10.1111/maps.12479
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发表时间：
2015
影响因子：
2.2
通讯作者：
Burchell M
中科院分区：
文献类型：
--
作者：
Burchell M
模拟了SMART-1与月球表面的寿命末期撞击，在两级轻气炮中撞击具有浅沙层的倾斜玄武岩目标。这模拟了可能的撞击地点，在那里松散的风化层将覆盖着一层固结良好的玄武岩岩层。使用的撞击角分别为与水平线成5°和10°。S−1的撞击速度为~2公里，弹丸为直径2.03毫米的铝球。沙子的深度大约在弹丸直径的0.8到1.8倍之间，这意味着月球表面有一个松散的土层，其尺寸与SMART-1航天器相似。只有在入射角度为10°时，才能在基岩中观察到一个凹坑，而且松散表面物质的深度小于弹丸直径，在这种情况下，基岩中还存在一个小坑状的凹坑。在所有情况下，炮弹都以浅角度从撞击地点反弹离开。这意味着在SMART-1撞击地点，陨石坑将有一个复杂的结构，裸露的基岩和附近的一些挖掘出的岩石发生移位，主航天器主体本身将不会出现在主陨石坑。
The SMART‐1 end‐of‐life impact with the lunar surface was simulated with impacts in a two stage light‐gas gun onto inclined basalt targets with a shallow surface layer of sand. This simulated the probable impact site, where a loose regolith will have overlaid a well consolidated basaltic layer of rock. The impact angles used were at 5° and 10° from the horizontal. The impact speed was ~2 km s−1and the projectiles were 2.03 mm diameter aluminum spheres. The sand depth was between approximately 0.8 and 1.8 times the projectile diameter, implying a loose lunar surface regolith of similar dimensions to the SMART‐1 spacecraft. A crater in the basement rock itself was only observed in the impact at 10° incidence, and where the depth of loose surface material was less than the projectile diameter, in which case the basement rock also contained a small pit‐like crater. In all cases, the projectile ricocheted away from the impact site at a shallow angle. This implies that at the SMART‐1 impact site the crater will have a complicated structure, with exposed basement rock and some excavated rock displaced nearby, and the main spacecraft body itself will not be present at the main crater.