2025年8月16日
A Cool GIF of a 2025 Perseid
Image Credit & Copyright: Renaud & Olivier Coppe
Explanation: The camera battery died about 2am local time on August 12, while shooting in the bright moonlit skies from a garden in Chastre, Brabant Wallon, Belgium, planet Earth. But not before it captured the frames used to compose this cool animated gif of a brilliant Perseid meteor and a lingering visible trail known as a persistent train. The Perseid meteor, a fast moving speck of dust from the tail of large periodic Comet Swift-Tuttle, was heated to incandescence by ram pressure and vaporized as it flashed through the upper atmosphere at 60 kilometers per second. Compared to the brief flash of the meteor, its wraith-like trail really is persistent. A characteristic of bright meteors, a smoke-like persistent train can often be followed for many minutes wafting in the winds at altitudes of 60 to 90 kilometers.
Tomorrow’s picture: cloudy skies
2025年英仙流星的酷炫动态GIF影像
影像提供与版权: Renaud & Olivier Coppe
说明: 于比利时瓦隆布拉省沙斯特尔镇的花园，拍摄地球满是月华的夜空时，相机的电池在当地时间8月12日凌晨2点左右耗尽。不过在电池耗尽之前，相机已经取得用来制作这部酷炫动态GIF影像的多帧定格，用以呈现一颗明亮的英仙流星及其久现流星迹。英仙流星的本尊则是来自周期性斯威福·塔特彗星彗尾的高速尘埃微粒，当它以每秒60公里的速度穿过地球高层大气时，发生汽化并受到冲压的加热而白炽发光。相较于流星亮闪的短暂，其幽灵般的流星迹有时可以流连良久。而明亮流星的特征之一，是会在60到90公里的高空，留下烟雾般的久现流星迹，然后随风飘荡达数分钟。
明日的图片: cloudy skies
