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该亚德彗星的尾巴(2011.10.20)- 每日天文一图摘译  

2011-10-20 12:37:02|  分类: NASA馆 |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |
该亚德彗星的尾巴(2011.10.20)- 每日天文一图摘译 - 秋天的麦兜 - 蜗牛壳

  目前正在地球夜空中闪耀的该亚德彗星(C/2009 P1)亮度仅低于肉眼可见,是双筒或小型望远镜的极佳观测目标。在上面这张10月15日的望远镜合成图中,是彗星带着它可爱的绿色彗发和动感的多重彗尾在暗弱的星空背景中拖行。图中的视野范围超过1度,约折合两个满月那么大,位置在武仙座南部边界附近。该亚德彗星现在距离地球约16光分远(2个天文单位),是一颗内层大型彗星,但它扫过内太阳系的时候并不会离地球或太阳很近,因此,在接下来的数月中,在它从武仙座慢慢滑过的期间,大概也只有通过望远镜才能看到它。

  更多天文精彩文章请关注网易博客小组:天文爱好者


Tails of Comet Garradd 
Image Credit & CopyrightGregg Ruppel

Explanation: A good target for binoculars and small telescopes, Comet Garradd (C/2009 P1) now shines in planet Earth's evening skies, a steady performerbut just below naked-eye visibility. Telescopic images like this composite from October 15 can find the comet with a lovely green coma, sporting multiple tails, and lingering against a background of faint stars. The field of view spans over 1 degree or about 2 full moons within the southern boundaries of the constellation Hercules. Now around 16 light minutes (2 astronomical units) away, P1 Garradd is an intrinsically large comet, but will never make a very close approach to Earth or the Sun while sweeping through the inner solar system. As a result, the comet will likely stay a sight for telescopic eyes only, moving slowly through the sky and remaining in Hercules during the coming months.

Tomorrow's picture: a hero's dust


  每日天文一图(APOD)是美国宇航局天体物理学部每日定期发布的天文图片,并配有专业的简短解释,是小子时常光顾的地方,地址为:http://apod.nasa.gov/apod/。现将部分酷图转来并对原文解释做了翻译,英文及天文知识均有限,译错之处敬请各位指正。
  秋天的麦兜 2011年10月20日 于济南。

  评论这张
 
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