APOD251006 彗星莱蒙的离子尾巴变化
彗星莱蒙的离子尾巴变化
Images Credit & 版权: Victor Sabet & Julien De Winter[1]
英文原文:Explanation: How does a comet tail change? It depends on the comet. The ion tail of Comet C/2025 A6 (Lemmon) has been changing markedly, as detailed in the featured image sequenced over five days between September 25 and October 3 (left to right) from Texas , USA . On some days, the comet's ion tail was relatively more complex than other days. Reasons for tail changes include the rate of ejection of material from the comet's nucleus , the strength and complexity of the passing solar wind , and the rotation rate of the comet . Sometimes, over the course of a week, apparent differences even result from a change of perspective from the Earth. In general, a comet's ion tail will point away from the Sun , as gas expelled is pushed out by the Sun's wind . Comet Lemmon is still inbound and brightening , passing nearest the Earth on October 21 and nearest the Su n on November 8. 说明: 彗星的尾巴如何变化?这取决于彗星的特性。 C/2025 A6(彗星 Lemmon)[2] 的离子尾[3]一直在显著变化,正如这张从9月25日至10月3日在美国[4]德克萨斯州[5]拍摄的五天串行图像(从左到右)所详述。 在某些日子,彗星的离子尾比其他日子更为复杂。尾巴变化的原因包括物质的喷出速率[6]、彗核[7]的状态、太阳风的强度和复杂性[8],以及彗星的自转速度[9]。有时,甚至因为地球观测角度的改变,会在一周内看到明显的差异[10]。 一般来说,彗星的离子尾会指向远离太阳的方向[11],因为气体被太阳风[12]推动。彗星 Lemmon[13]仍在接近地球并变得更亮[14],将于10月21日最接近地球[15],并于11月8日最接近太阳[16]。
明日的图片: supernova encore[17]
Authors & editors: Robert Nemiroff[18] (MTU[19]) & Jerry Bonnell[20] (UMCP[21])
NASA Official: Amber Straughn Specific rights apply[22].
NASA Web Privacy[23], Accessibility[24], Notices[25];
A service of: ASD[26] at NASA[27] / GSFC[28],
NASA Science Activation[29]
& Michigan Tech. U.[30]
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[31]
[1]https://www.instagram.com/dwj85
[2]https://en.wikipedia.org/wiki/C/2025_A6_(Lemmon)
[3]http://www2.ess.ucla.edu/~jewitt/tail.html
[4]https://www.cia.gov/the-world-factbook/countries/united-states/
[5]https://en.wikipedia.org/wiki/Texas
[6]http://apod.nasa.gov/apod/ap151118.html
[7]https://www.cometcampaign.org/files/images/comets_spacecraft.jpg
[8]http://apod.nasa.gov/apod/ap240219.html
[9]http://apod.nasa.gov/apod/ap240318.html
[10]https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQ6lFzHCKMkunRIUqUAJerIKuGItiBUIiKoOA&s
[11]https://spaceplace.nasa.gov/comets/en/anatomy-of-a-comet.en.jpg
[12]http://apod.nasa.gov/apod/ap000318.html
[13]https://earthsky.org/space/comet-lemmon-best-comet-of-2025-finder-maps/
[14]https://theskylive.com/c2025a6-info
[15]https://visibleearth.nasa.gov/
[16]https://science.nasa.gov/sun/
[17]http://apod.nasa.gov/apod/ap251007.html
[18]http://www.phy.mtu.edu/faculty/Nemiroff.html
[20]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[22]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[23]https://www.nasa.gov/about/highlights/HP_Privacy.html
[24]https://www.nasa.gov/general/accessibility/
[25]https://www.nasa.gov/privacy/
[26]https://astrophysics.gsfc.nasa.gov/
[28]https://www.nasa.gov/centers/goddard/
[29]https://science.nasa.gov/learners
[31]mailto:alfred@ncku.edu.tw
http://apod.nasa.gov/apod/ap251006.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap251006.html