APOD251013 柠檬树
柠檬树
图像提供与版权: Uroš Fink[1]
英文原文:Explanation: The tree is not in danger. That's because the comet pictured just above it, Comet C/2025 A6 (Lemmon) , is far in the distance, well away from the Earth. Comet Lemmon now continues to brighten as it arcs through the inner Solar System , even though it has passed its nearest to the Sun -- because it is now approaching the Earth . The comet will likely appear brightest when it is at its closest to the Earth next week, then closing to about half the Earth-Sun distance . Comet Lemmon may then be visible to the unaided eye, but it is more likely to be imaged by a camera phone -- if you know where to look . Comet Lemmon, previously best visible in the morning, is now also visible in the evening sky for northern observers: look above the western horizon just after sunset. The featured image was taken in Slovenia about a week ago. 说明: 这棵树没有危险。 这是因为照片中它上方的彗星 C/2025 A6(彗星 Lemmon)[2]其实离地球非常遥远。 彗星 Lemmon 目前在穿越[3]内太阳系[4]的过程中持续变亮,尽管它已经通过了最接近太阳[5]的点,但现在正逐渐接近 地球[6]。 下周当它与地球距离缩短至约 太阳与地球距离[7]的一半时,预计会达到最大亮度[8]。届时彗星Lemmon[9]可能肉眼可见,但更有可能能用手机相机拍摄到——前提是你知道 往哪个方向观察[10]。 彗星 Lemmon 先前在清晨最容易看到[11],如今北半球观测者也能在傍晚的天空中看到它:日落后朝西方地平在线方寻找即可。这张 精选照片[12]以一棵毫无防备的欧洲山毛榉树为中心,约于十天前在斯洛文尼亚[13]拍摄。
明日的图片: unusual space globule[14]
Authors & editors: Robert Nemiroff[15] (MTU[16]) & Jerry Bonnell[17] (UMCP[18])
NASA Official: Amber Straughn Specific rights apply[19].
NASA Web Privacy[20], Accessibility[21], Notices[22];
A service of: ASD[23] at NASA[24] / GSFC[25],
NASA Science Activation[26]
& Michigan Tech. U.[27]
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[28]
[1]https://www.instagram.com/urosfink/
[2]https://en.wikipedia.org/wiki/C/2025_A6_(Lemmon)
[3]https://theskylive.com/c2025a6-info
[4]https://science.nasa.gov/solar-system/
[5]http://apod.nasa.gov/apod/ap250521.html
[6]http://apod.nasa.gov/apod/ap220206.html
[7]https://en.wikipedia.org/wiki/Astronomical_unit
[8]http://www.aerith.net/comet/catalog/2025A6/2025A6.html
[9]https://earthsky.org/space/comet-lemmon-best-comet-of-2025-finder-maps/
[11]http://apod.nasa.gov/apod/ap250930.html
[12]https://www.instagram.com/p/DPgKrMjjREV/
[13]https://en.wikipedia.org/wiki/Slovenia
[14]http://apod.nasa.gov/apod/ap251014.html
[15]http://www.phy.mtu.edu/faculty/Nemiroff.html
[17]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[19]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[20]https://www.nasa.gov/about/highlights/HP_Privacy.html
[21]https://www.nasa.gov/general/accessibility/
[22]https://www.nasa.gov/privacy/
[23]https://astrophysics.gsfc.nasa.gov/
[25]https://www.nasa.gov/centers/goddard/
[26]https://science.nasa.gov/learners
[28]mailto:alfred@ncku.edu.tw
http://apod.nasa.gov/apod/ap251013.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap251013.html