Near-Earth Asteroids(NEA)impose potential major disaster to *** defense is an inevitable requirement for the survival of human *** recent years,China has made rapid progress in planetary defense research,which has won...
详细信息
Near-Earth Asteroids(NEA)impose potential major disaster to *** defense is an inevitable requirement for the survival of human *** recent years,China has made rapid progress in planetary defense research,which has won the attention of the government and attracted more and more scholars and *** paper summarizes the research progress in planetary defense in China in recent years,including the fireball events in China,academic activities and policy planning,monitoring and warning technology,onorbit defense technology,impact hazard assessment,international cooperation and science popularization.
Subsurface exploration is one of the most ambitious scientific objectives of the Hayabusa2 mission.A small device called small carry-on impactor(SCI)was developed to create an artificial crater on the surface of aster...
详细信息
Subsurface exploration is one of the most ambitious scientific objectives of the Hayabusa2 mission.A small device called small carry-on impactor(SCI)was developed to create an artificial crater on the surface of asteroid *** enables us to sample subsurface materials,which will provide a window to the *** physical properties of the resulting crater are also useful for understanding the internal structure of *** understanding of the crater and ejecta properties,including the depth of excavation of subsurface materials,requires accurate information on impact *** particular,the impact angle is a critical factor because it greatly influences the size and shape of the *** April 5,2019,the Hayabusa2 spacecraft deployed the SCI at 500 m of altitude above the asteroid *** SCI gradually reduced its altitude,and it shot a 2 kg copper projectile into the asteroid 40 min after *** the position of the released SCI is essential for determining the impact *** study describes the motion reconstruction of the SCI based on the actual operation *** results indicate that the SCI was released with high accuracy.
暂无评论