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.
俄罗斯近日(2月15日)发生的陨石爆炸已造成超过500人受伤,毁坏了数百座建筑。美国宇航局一位科学家表示,这次陨石爆炸并不是由小行星撞击地球引起的。
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(它平坠着陆并发生爆炸)。现在来估计能量释放或者原始大小还为时尚早。”
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