文章来源：http://neo.jpl.nasa.gov/news/news172.html，版权归原作者及网站所有！
Don Yeomans & Paul Chodas
NASA/JPL Near-Earth Object Program Office
June 23, 2011
Trajectory of 2011 MD projected onto the Earth’s orbital plane. Note from this viewing angle, the asteroid passes underneath the Earth.
Trajectory of 2011 MD from the general direction of the Sun.
Near-Earth asteroid 2011 MD will pass only 12,000 kilometers (7,500 miles) above the Earth’s surface on Monday June 27 at about 9:30 EDT. The asteroid was discovered by the LINEAR near-Earth object discovery team observing from Socorro, New Mexico. The diagram on the left shows the trajectory of 2011 MD projected onto the Earth’s orbital plane over a four-day interval. The diagram on the left gives another view from the general direction of the Sun that indicates that 2011 MD will reach its closest Earth approach point in extreme southern latitudes (in fact over the southern Atlantic Ocean). This small asteroid, only 5-20 meters in diameter, is in a very Earth-like orbit about the Sun, but an orbital analysis indicates there is no chance it will actually strike Earth on Monday. The incoming trajectory leg passes several thousand kilometers outside the geosynchronous ring of satellites and the outgoing leg passes well inside the ring. One would expect an object of this size to come this close to Earth about every 6 years on average. For a brief time, it will be bright enough to be seen even with a modest-sized telescope.
不规范不严谨不一定正确的译文，E文越来越烂了：
近地小行星（编号）2011MD将于美国东部时间6月27日九点半左右，从距离地球12000公里（7500英里）擦肩而过。这颗小行星是由 LINEAR近地小行星项目组在新墨西哥索科洛发现的。第一幅图显示了近四天的时间内，2011MD在地球轨道平面的轨迹。第二幅图则给出了太阳方向的 2011MD轨道。2011MD最接近地球时候靠近南大西洋。这颗小行星直径大概只有5到20米，是在一个非常近似于类地轨道上运行，但轨道分析表明，它没有机会在周一的时候撞击上地球。它靠近地球时的轨道（进入和离去），将穿越几千公里的地球同步卫星轨道内环。这种大小的近地小行星大概平均6年就会接近地球一次。在一个非常短的时间段内，它会增到足够一个中等口径的望远镜观测到。
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