“巨型”小行星将与地球擦肩而过(图)
据国外媒体报导,科学家发现一颗“巨型”小行星将与地球擦肩而过,与地球的距离大约为580万公里,大约为360万英里,是地球到月球距离的15倍左右。 这颗小行星被科学家命名为小行星1998QE2,根据最新的观测报告,其质量相当于9艘巨轮,由于近地点处于地月系之外,因此并没有对地球构成太大的威 胁,但是天文学家却对该小行星颇为兴趣,研究人员可以通过射电天文学对小行星进行研究, 1998QE2小行星的宽度大约为70米左右,即230英尺,是射 电望远镜观测的理想目标。
来自NASA喷气推进实验室的首席研究员兰斯·本纳介绍:“1998QE2小行星就是阿雷西博射电望远镜和戈德斯通70天线阵的探索对象,科学家将获得一系列的高分辨率图像揭示这颗小行星的细微结构。”每当一颗小行星抵近地球时,科学家就会对其进行详细观测,以获取关于小行星大小、形状、旋转速度以及表面等特征,这些信息将告诉我们关于这颗小行星的起源之谜,是一次重要的科学研究机会。
先进的射电望远镜可以探测到小行星的距离和运行速度,并通过计算机修正小行星未来的运行轨迹,观察它们就以何种轨道运动,由此也可推算小行星的起源。1998QE2小行星最接近地球的时间为太平洋时间5月31日下午1:59分,科学家计划动用的望远镜包括著名的阿雷西博射电望远镜,其强大的观测能力可以探测到至少400万英里远,大小为3.75米大小的空间天体。
研究人员认为这是我们第一次看到小行星的高清细节图像,而位于加利福尼亚州的戈德斯通射电望远镜阵则是为深空天体观测所打造,两台望远镜进行了互补的观测能力,使得科学家们可以近距离研究这颗小行星。到目前为止,NASA参与的探测项目已经发现了98%的近地天体,2012年近地天体项目的研究预算从600万美元升至2000万美元。到了2015年,NASA将发射一个无人探测器前往近地天体进行探索,除了监视这些威胁地球的天体外,NASA还将在小行星上寻找水资源或者有机分子的起源之谜。
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