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8月1日凌晨我国将现月掩最亮恒星罕见天象
蓝冰
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Joined: 20 Sep 2007
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蓝冰Collection
PostPosted: 2009-07-31 04:26:28    Post subject: 8月1日凌晨我国将现月掩最亮恒星罕见天象 Reply with quote

8月1日凌晨我国将现月掩最亮恒星罕见天象

2009/07/31 07:48 来源:新华网


  据广东天文学会预告:今年8月1日凌晨,如果天气晴朗,广州乃至我国部分地区,都可目睹到月亮遮掩天蝎座最亮恒星“心宿二”的特殊天象。


  据广东天文学会常务理事李建基介绍,心宿二是恒星世界中色泽最红的恒星,又叫“大火”,它的亮度为一等星。心宿二是庞然大物,它的直径是太阳的600倍,它的光度为太阳的6000倍。


  7月31日夜幕降临后,月亮高挂南天。在月亮的东面不远处,可看到有一颗较明亮的星星,那就是心宿二。由于月亮自西向东运行,观测者将感到月亮越来越接近心宿二。


  据李建基介绍,7月31日太阳西沉40分钟后,我国部分地区,如广州、香港、澳门、海口、南宁、长沙、昆明和拉萨等,都可看到月亮与心宿二从相会直至相拥的少见天象。


  其中,在广州,7月31日的日落时间是19时09分。即从19时49分起,广州就可看到心宿二与月亮相聚。8月1日零时36分,月亮的东边缘(黑暗处)将吞食心宿二。此时,月亮的地平高度角是11度。如果借助双筒望远镜观察,效果更理想。
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