天空中的两颗相机彗星
(原标题: Two Camera Comets in One Sky)
2025-09-29
浏览次数: 170
这些彗星看起来像是在赛跑，但事实并非如此。彗星C/2025 K1 ATLAS（左）和C/2025 R2 SWAN（右）上周在南印度洋的法国留尼汪岛上偶然出现在一起。较暗的阿特拉斯彗星正在接近我们的太阳，并将在10月初到达最接近太阳的地方，届时它也将是太阳上最亮的彗星——尽管只有在相机上长时间曝光才能看到。这颗更亮的彗星，绰号为SWAN25B，现在正远离我们的太阳，尽管它最接近地球的时间预计在10月中旬，乐观的估计，那时它会变得足够亮，可以用肉眼看到。每颗彗星都有一个绿色的气体彗发和一个远离太阳的离子尾巴。成长画廊：彗星SWAN25B
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It may look like these comets are racing, but they are not. Comets C/2025 K1 ATLAS (left) and C/2025 R2 SWAN (right) appeared near each other by chance last week in the featured image taken from France's Reunion Island in the southern Indian Ocean. Fainter Comet ATLAS is approaching our Sun and will reach its closest approach in early October when it is also expected to be its brightest -- although still only likely visible with long exposures on a camera. The brighter comet, nicknamed SWAN25B, is now headed away from our Sun, although its closest approach to Earth is expected in mid-October, when optimistic estimates have it becoming bright enough to see with the unaided eye. Each comet has a greenish coma of expelled gas and an ion tail pointing away from the Sun. Growing Gallery: Comet SWAN25B
© Luc Perrot (TWAN)