APOD250806 星系前方的流星
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图像提供与版权: Fritz Helmut Hemmerich[1]
英文原文:Explanation: What's that green streak in front of the Andromeda galaxy? A meteor. While photographing the Andromeda galaxy in 2016, near the peak of the Perseid Meteor Shower , a small pebble from deep space crossed right in front of our Milky Way Galaxy 's far-distant companion. The small meteor took only a fraction of a second to pass through this 10-degree field. The meteor flared several times while braking violently upon entering Earth's atmosphere . The green color was created, at least in part, by the meteor's gas glowing as it vaporized. Although the exposure was timed to catch a Perseid meteor , the orientation of the imaged streak seems a better match to a meteor from the Southern Delta Aquariids , a meteor shower that peaked a few weeks earlier. Not coincidentally, the Perseid Meteor Shower peaks next week, although this year the meteors will have to outshine a sky brightened by a nearly full moon. 说明: 那道在仙女座星系前方的绿色光迹是什么? 那是一颗流星。 在2016年拍摄仙女座星系[2]时,正值英仙座[3]流星[4]雨[5]高峰期,一颗来自深太空的小石子正好掠过[6]我们银河系[7]的遥远伴星系的前方。 这颗小流星[8]用不到一秒的时间就穿过了这片10度宽的视野。 流星在高速进入地球大气层[9]后,出现数次闪燃发光[10]。 这道绿色光芒[11]至少部分是由于流星在汽化成气体发光所致。 虽然曝光时间[12]的设置是为了捕捉英仙座流星[13],但图像中流星迹的方向似乎更符合来自南三角座流星雨[14]的流星,而这群流星雨[15]则在几周前达到高峰。 无独有偶,英仙座流星雨[16]将在下周达到高峰,然而今年[17]的流星将不得不与几乎满月的明亮夜空[18]争辉。
明日的图片: open space[19]
Authors & editors: Robert Nemiroff[20] (MTU[21]) & Jerry Bonnell[22] (UMCP[23])
NASA Official: Amber Straughn Specific rights apply[24].
NASA Web Privacy[25], Accessibility[26], Notices[27];
A service of: ASD[28] at NASA[29] / GSFC[30],
NASA Science Activation[31]
& Michigan Tech. U.[32]
太空天文实验室(成功大学物理系)
<br/> 编辑:<a href="mailto:hantzong.su@gmail.com" style="color:gray;" target="_blank">苏汉宗</a> 编辑:陈炳志[33]
[1]https://www.flickr.com/people/fhhemmerich/
[2]http://apod.nasa.gov/apod/ap150830.html
[3]https://www.facebook.com/media/set/?set=a.488496753878907&type=3
[4]https://www.facebook.com/media/set/?set=a.2859552167482317&type=3
[5]https://www.facebook.com/media/set/?set=a.3855532511217606&type=3
[6]http://apod.nasa.gov/apod/ap030802.html
[7]https://science.nasa.gov/resource/the-milky-way-galaxy/
[8]https://en.wikipedia.org/wiki/Meteoroid#Meteors
[9]https://science.nasa.gov/earth/earth-atmosphere/earths-atmosphere-a-multi-layered-cake/
[10]http://apod.nasa.gov/apod/ap081011.html
[11]https://www.amsmeteors.org/fireballs/faqf/#5
[12]https://www.flickr.com/photos/fhhemmerich/28945882316/in/dateposted/
[13]http://apod.nasa.gov/apod/ap160808.html
[14]https://en.wikipedia.org/wiki/Southern_Delta_Aquariids
[15]https://earthsky.org/astronomy-essentials/everything-you-need-to-know-delta-aquarid-meteor-shower
[16]http://apod.nasa.gov/apod/ap180808.html
[17]https://earthsky.org/astronomy-essentials/everything-you-need-to-know-perseid-meteor-shower/
[18]http://apod.nasa.gov/apod/ap200408.html
[19]http://apod.nasa.gov/apod/ap250807.html
[20]http://www.phy.mtu.edu/faculty/Nemiroff.html
[22]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[24]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[25]https://www.nasa.gov/about/highlights/HP_Privacy.html
[26]https://www.nasa.gov/general/accessibility/
[27]https://www.nasa.gov/privacy/
[28]https://astrophysics.gsfc.nasa.gov/
[30]https://www.nasa.gov/centers/goddard/
[31]https://science.nasa.gov/learners
[33]mailto:alfred@ncku.edu.tw
http://apod.nasa.gov/apod/ap250806.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap250806.html
