今日天文图片
彗星R3穿越时间
(原标题: Comet R3 PanSTARRS Through Time)
2026-06-08
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当彗星离开我们的内太阳系时会发生什么？现在，一颗彗星进入内太阳系通常会被大张旗鼓地宣布，并寄予厚望，希望彗星会变得明亮而上镜。但在离开的过程中，彗核受到太阳的温暖较少，被排出的气体和尘埃较少，彗核周围明亮的彗发缩小并消失，彗尾长度也随之缩短。然后，许多彗星将返回外太阳系，并在数百年或数千年后返回。相比之下，一些彗星——比如彗星C/2025 R3 （PanSTARRS）——受到行星的引力踢，因此永远不会回来。图为5月上旬至中旬在智利Cerro paral附近的许多夜晚拍摄的彗星R3 PanSTARRs。后来的图像更靠近顶部，清晰地显示了收缩的离子尾巴。彗星R3画廊：2026年的彗星R3 PanSTARRS
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What happens to a comet as it leaves our inner Solar System? Now, the arrival of a comet into the inner Solar System is typically heralded with great fanfare and high hopes that the comet will become bright and photogenic. But on the way out, the comet's nucleus is less warmed by the Sun, less gas and dust are expelled, the bright coma around the nucleus shrinks and fades, and the tail length drops off. Many comets will then return to the outer Solar System and only return in hundreds or thousands of years. In contrast, some comets -- like Comet C/2025 R3 (PanSTARRS) -- receive a gravitational kick from the planets and so will never return. Pictured, Comet R3 PanSTARRs was imaged deeply many nights in early to mid-May near Cerro Paranal in Chile. Later images appear closer to the top and clearly show the shrinking ion tail. Comet R3 Gallery: Comet R3 PanSTARRS in 2026
© Jakub Kuřák & Martin Mašek (FZU of the Czech Academy of Sciences)