The resonant orbit of the lost city meteorite
The resonant orbit of the lost city meteorite
复制标题
失落之城陨石的共振轨道
DOI：
10.1029/jb080i020p02914
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发表时间：
1975
影响因子：
--
通讯作者：
J. Williams
中科院分区：
文献类型：
--
作者：
J. Williams
对木星和土星在迷城陨石轨道上的长周期扰动的积分表明，陨石的平均节点速率与木星和土星的节点速率几乎相同。这种几乎相等的速率导致了陨石轨道倾角的巨大共振变化，周期约为1百万年。共振使轨道演变对摄动计算的不足和撞击时的元素值过于敏感，无法进行确定性计算。它表明，一个类似于陨石轨道的轨道可以花费88%的时间，偏心率太小，不允许与地球轨道相交。迷城陨石的普通宇宙射线暴露年龄并不表明其碰撞寿命是不寻常的，但共振在确定典型陨石寿命中的作用是未知的。
An integration of the long-period perturbations of Jupiter and Saturn on the orbit of the Lost City meteorite shows that the average nodal rate of the meteorite was nearly the same as the nodal rates of Jupiter and Saturn. This near equality of rates led to a large resonant variation in the inclination of the meteorite's orbit with a period of the order of 1 m.y. The resonance makes the orbital evolution too sensitive to the deficiencies of the perturbation calculations and to the values of the elements at impact to allow definitive calculations. It is shown that an orbit similar to the meteorite's orbit can spend ∼88% of its time with an eccentricity too small to allow for intersections with the earth's orbit. The ordinary cosmic ray exposure age of the Lost City meteorite does not suggest that its collisional lifetime was unusual, but the role of resonances in determining the lifetime of typical meteorites is unknown.