APOD250821 多数来自英仙座流星雨的流星
多数来自英仙座流星雨的流星
图像提供 & 版权[1]: Klaus Pillwatsch[2]
英文原文:Explanation: In this predawn skyscape recorded during the early morning hours of August 13, mostly Perseid meteors are raining down on planet Earth. You can easily identify the Perseid meteor streaks. They're the ones with trails that seem to converge on the annual meteor shower's radiant, a spot in the heroic constellation Perseus, located off the top of the frame. That's the direction in Earth's sky that looks along the orbit of this meteor shower's parent, periodic Comet Swift-Tuttle . Of course the scene is a composite, a combination of about 500 digital exposures to capture meteors registered with a single base frame exposure. But all exposures were taken during a period of around 2.5 hours from a wind farm near Mönchhof, Burgenland, Austria. Red lights on the individual wind turbine towers dot the foreground. In their spectacular close conjunction , bright planets Jupiter and Venus are poised above the eastern horizon . 说明： 在 8 月 13 日的黎明前天空中[3]，英仙座流星雨正如雨点般降落到地球上。 你可以很容易辨认出哪些是英仙座流星[4]。 它们的轨迹看起来都仿佛从一个共同的点辐射开来。那个点就是英仙座流星雨[5]的「辐射点」，位于英仙座的方向，画面上方之外的位置。从地球的角度看，这个方向正对着流星雨母体──周期性彗星 Swift-Tuttle [6]的轨道。 眼前的画面其实是一张合成照，由大约 500 张数字图像堆栈而成，其中每一张都拍下了出现的流星，再配合一张基底的夜空曝光。所有图像都是在奥地利布尔根兰邦蒙希霍夫（Mönchhof）附近的风力发电场，于 2.5 小时内拍摄完成。前景中可以看到风力发电机塔身上的红色指示灯。 在东方地平在线方[7]，还能看到木星与金星这两颗明亮行星的「超近距离相会」[8]。它们在天空中紧紧相依，与满天飞驰的流星一同构成这幅壮丽的清晨天象。
明日的图片： pixels in space[9]
Authors & editors: Robert Nemiroff[10] (MTU[11]) & Jerry Bonnell[12] (UMCP[13])
NASA Official: Amber Straughn Specific rights apply[14].
NASA Web Privacy[15], Accessibility[16], Notices[17];
A service of: ASD[18] at NASA[19] / GSFC[20],
NASA Science Activation[21]
& Michigan Tech. U.[22]
太空天文实验室（成功大学物理系）
编辑：林昱丞[23]
[1]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[2]https://www.instagram.com/p_i_k_a_s_s/
[3]https://www.instagram.com/p_i_k_a_s_s/p/DNiH8mztIPq/
[4]http://apod.nasa.gov/apod/ap250802.html
[6]https://science.nasa.gov/solar-system/comets/109p-swift-tuttle/
[7]http://apod.nasa.gov/apod/ap250815.html
[8]https://earthsky.org/todays-image/venus-and-jupiter/
[9]http://apod.nasa.gov/apod/ap250822.html
[10]http://www.phy.mtu.edu/faculty/Nemiroff.html
[12]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[14]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[15]https://www.nasa.gov/about/highlights/HP_Privacy.html
[16]https://www.nasa.gov/general/accessibility/
[17]https://www.nasa.gov/privacy/
[18]https://astrophysics.gsfc.nasa.gov/
[20]https://www.nasa.gov/centers/goddard/
[21]https://science.nasa.gov/learners
[23]http://apod.nasa.gov/apod/l28091033@gs.ncku.edu.tw
http://apod.nasa.gov/apod/ap250821.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap250821.html
