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本月可看月偏食流星雨

2017-08-04 12:14:20   中国青年网

兰州晚报讯(记者何燕实习生胡雪晴周晓岚)8月的天象可称精彩,7日夜,大家可以观测到一次月偏食天象;英仙座流星雨也将在12日晚间出现极大值。

据了解,这次月偏食的半影食开始于北京时间7日23时48分,初亏时已经到了8日1时22分,全过程多数时间都发生在8月8日凌晨至黎明时分。食甚出现在2时21分,3时19分复圆,偏食阶段持续将近两个小时。4时53分半影食终,我国大部分地区天色已经很亮了。我国除东北部分地区不能观测到后半部分的半影食之外,其他地区都能观测到月偏食的全过程。稍显遗憾的是,本次月偏食的最大食分只有0.2464,也就是说月球进入地球本影的部分不太多。而到了明年1月31日晚,将有一次我国大部分地区都可见的月全食发生,届时大家可以一睹“红月亮”的风采。

每年的暑期,英仙座流星雨都是最具标志性的天象。它的活跃期从7月17日持续至8月24日,基本覆盖学生的暑假。英仙座流星雨的母彗星是109P/Swift-Tuttle彗星,它的远日点距离太阳约51个天文单位,近日点0.96个天文单位,回归周期长达133年。这颗彗星上一次回归是在1992年,当时它距离地球最近时大约1.1个天文单位。它的下一次回归预计发生在2126年,当年的8月14日,彗星距离地球最近时将只有不到0.2个天文单位。

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