天鹅座Kappa星座的十二年
(原标题: Twelve Years of Kappa Cygnids)
2025-07-25
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天鹅座卡帕流星雨的流星在这张延时合成的天空景观中被捕捉到。这个小型流星雨的辐射点离它的同名恒星天鹅座Kappa不远，它在8月中旬达到峰值，几乎与更著名、更容易观测到的英仙座流星雨同时出现。但是，天鹅座卡帕的峰值速度每小时只有3颗流星，它的数量远远超过了英仙座的流星雨，英仙座的流星雨更受欢迎，更多产。为了捕捉几十颗天鹅座卡帕星，这个长期的天文成像项目收集了2012年至2024年8月51个夜晚的流星。大多数已确定的天鹅座卡帕流星雨都是在2021年8月拍摄的，这是已知的7年活动周期的最高点。在2021年8月，希腊克里特岛Elafonisi海滩上方的银河的海洋和夜空背景下，记录了12年的天鹅座卡帕星。
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Meteors from the Kappa Cygnid meteor shower are captured in this time-lapse composite skyscape. The minor meteor shower, with a radiant not far from its eponymous star Kappa Cygni, peaks in mid-August, almost at the same time as the much better-known and better-observed Perseid meteor shower. But, seen to have a peak rate of only about 3 meteors per hour, Kappa Cygnids are vastly outnumbered by the more popular, prolific Perseid shower's meteors that emanate from the heroic constellation Perseus. To capture dozens of Kappa Cygnids, this long term astro-imaging project compiled meteors in exposures selected from over 51 August nights during the years 2012 through 2024. Most of the exposures with identified Kappa Cygnid meteors were made in August 2021, a high point of the shower's known 7-year activity cycle. All twelve years worth of Kappa Cygnids are registered against a base sea and night skyscape of the Milky Way above Elafonisi Beach, Crete, Greece, also recorded in August of 2021.
© Petr Horálek