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17P/Holmes彗星新动态长出小尾巴了

2007/11/12镜像同步10 回复

17P/Holmes彗星新动态长出小尾巴了该彗星的详细资料见之前的帖子http://forum.byr.edu.cn/wForum/disparticle.php?boardName=Picture&ID=903955&pos=2 Credit & Copyright: Ivan Eder and (inset) Paolo Berardi Astronomy Picture of the Day 2007 November 10 Explanation: A beautiful blue ion tail has become visible in deep telescopic images of Comet Holmes. Pointing generally away from the Sun and also planet Earth, the comet's ion tail is seriously foreshortened by our extreme viewing angle. Still, enthusiastic comet watchers have remarked that on the whole, the compact but tentacled appearance suggests a jellyfish or even a cosmic calamari. This stunning view of the comet's greenish coma and blue tail was recorded on November 4 in clear skies near Budapest, Hungary. The colors are caused by molecules in the tenuous gas, like C2 (green) and CO+ (blue), fluorescing in sunlight. In a more recent development, the dramatic inset is a deep image from L'Aquila in central Italy on November 8, showing the ion tail disconnecting from the comet. Credit & Copyright: Vicent Peris and José Luis Lamadrid (astrofoto.es) Astronomy Picture of the Day 2007 November 5 Explanation: Comet Holmes continues to be an impressive sight to the unaided eye. The comet has diminished in brightness only slightly, and now clearly appears to have a larger angular extent than stars and planets. Astrophotographers have also noted a distinctly green appearance to the comet's coma over the past week. Pictured above over Spain in three digitally combined exposures, Comet 17P/Holmes now clearly sports a tail. The blue ion tail is created by the solar wind impacting ions in the coma of Comet Holmes and pushing them away from the Sun. Comet Holmes underwent an unexpected and dramatic increase in brightness starting only two weeks ago. The detail visible in Comet Holmes' tail indicates that the explosion of dust and gas that created this dramatic brightness increase is in an ongoing and complex event. Comet Holmes will move only slightly on the sky over during the next month.

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17P/Holmes彗星新动态 长出小尾巴了

17P/Holmes彗星新动态长出小尾巴了