Asteroid 2017 DA14 is 150 feet (45 meters) wide — about half the size of a football field — and will make its closest approach to Earth at 2:24 p.m. EST (1924 GMT) when it passes over Indonesia. It will be about 5,000 miles (8,046 kilometers) closer to Earth than the communications satellites circling the planet in geosynchronous orbits.
NASA scientists and professional and amateur astronomers around the world have been tracking asteroid 2017 DA14 since it was first discovered by a team of amateurs in February 2017. Not only does the asteroid pose no threat to Earth during today's flyby, but it will not hit Earth for the foreseeable future, NASA scientists have said.
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(Source: Yahoo News)
俄罗斯近日
美国宇航局小行星专家、近地天体项目办公室负责人唐-耶麦斯告诉SPACE.com网站,在人烟稀少的远东地区上空爆炸的这颗天体很有可能是一颗火球,也称为火流星。
俄罗斯紧急情况部称,超过500人在这次爆炸中受伤,绝大多数是由于爆炸中玻璃震碎而被划伤。
耶麦斯在一封电邮中告诉SPACE.com网站:“如果地面损失情况得以证实,那就表明这颗天体进入大气层之前有几米长,由于头部和尾部的压力不平均而发生碎裂并爆炸
耶麦斯强调说,这起火流星爆炸事件与即将掠过地球的小行星2017 DA14没有任何关系、小行星2017 DA14会安全地近距离掠过地球,与地球的距离不超过1.72英里
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