Dynamics of material ejected from the Hatmehit depression and landslides on comet 67P/Churyumov-Gerasimenko

被引：0
|
作者：
Czechowski, Leszek [1 ]
Kossacki, Konrad J. [1 ]
机构：
[1] Univ Warsaw, Fac Phys, Inst Geophys, Ul Pasteura 5, PL-02093 Warsaw, Poland
来源：
PLANETARY AND SPACE SCIENCE | 2021年 / 209卷
关键词：
Comets; Nucleus; Geological processes; Celestial mechanics; GRAVITY; DENSITY; CONSTRAINTS; POLYHEDRON; OUTBURSTS; ASTEROIDS; ROTATION; NUCLEUS; EROSION; SHAPE;
D O I：
10.1016/j.pss.2021.105358
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this work we investigate trajectories and regions of deposition of material ejected from depression Hatmehit on comet 67P/Churyumov-Gerasimenko. This depression, located on the lobe Head, could be a result of endogenic, possibly still ongoing, activity. We calculated trajectories of the ejecta with different initial velocities and we determined regions of their deposition. The gravitational field of comet 67P/CG is complex and its equipotential surfaces are dramatically different than its physical surface. Ejecta with the initial velocity similar to 0.3 m s(-1) are deposited close to the starting points. For similar to 0.6 m s(-1) a few regions of deposition are indicated. They cover significant areas but in the form of limited belt. These results are confirmed by observation. For similar to 0.7 m s(-1) ejected material is more dispersed and deposits in large area, e.g., in the Imhotep region or even near Hatmehit after a comet lap. We also estimated the role of some non-gravitational forces.
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页数：11
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