太阳落山它才“起床” 智神星10日表演“冲日”
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新华网天津12月9日电(记者周润健、蔡玉高)天津、江苏两地天文学会通报,智神星即2号小行星12月10日冲日表演,借助于小型天文望远镜,公众有望一睹其神秘色彩。
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据天津市天文学会理事赵之珩介绍,在火星和木星轨道之间有数十万颗绕太阳运动的小行星,肉眼一般无法看到。最早发现的“谷神星”“智
神星”“婚神星”和“灶神星”是小行星中最大的四颗,并称四大金刚。
智神星是在1802年3月28日被德国天文学家奥伯斯在室女座附近天区首先发现。由于它是第二颗被发现的小行星,因此也被称为第2号小行星。
天文专家表示,冲日是观测小行星难得的机遇。冲日期间,智神星与太阳的黄经相差180度,太阳一落山智神星即从东方地平线升起,直到第二天日出才从西方落下,因此整夜均可观测。眼下,这颗小行星与地球的距离最近,亮度也远胜平时,肉眼不可见,但天文爱好者凭借双筒望远镜或小型天文望远镜就可搜索到它的“身影”。
如何搜寻智神星呢?天文专家指导说,冲日期间,天文爱好者可用双筒望远镜或小型天文望远镜在天鸽座里观看“智神星”。连续观测半小时以上,会发现它在恒星的背景图案上缓慢移动,这也是区别行星与恒星的主要方法。
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