彗星C/2025 R2 （SWAN）
(原标题: Comet C/2025 R2 (SWAN))
2025-09-18
浏览次数: 1846
来自外太阳系的新访客，彗星C/2025 R2 （SWAN）也被称为SWAN25B，直到上周晚些时候，也就是9月11日才被发现。这是彗星到达近日点的前一天，近日点是它离太阳最近的地方。这颗彗星最初是由Vladimir Bezugly在SOHO航天器上的SWAN仪器上拍摄的图像中发现的，它的亮度惊人，但在太阳的强光下很难看到，这是可以理解的。在9月17日拍摄的这张望远镜快照中，C/2025 R2 （SWAN）的绿色彗发和彗尾仍然离太阳很近。这颗彗星距离地球大约6.5光分的时候，室女座的阿尔法星斯皮卡在画面的左上方边缘发出光芒。10月2日，这颗天鹅彗星将在日落后靠近西方地平线，在南半球用双筒望远镜更容易看到，它将在天秤座的α星Zubenelgenubi附近经过。C/2025 R2 （SWAN）计划在10月20日左右最接近我们美丽的星球。
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A new visitor from the outer Solar System, comet C/2025 R2 (SWAN) also known as SWAN25B was only discovered late last week, on September 11. That's just a day before the comet reached perihelion, its closest approach to the Sun. First spotted by Vladimir Bezugly in images from the SWAN instrument on the sun-staring SOHO spacecraft, the comet was surprisingly bright but understandably difficult to see against the Sun's glare. Still close to the Sun on the sky, the greenish coma and tail of C/2025 R2 (SWAN) are captured in this telescopic snapshot from September 17. Spica, alpha star of the constellation Virgo, shines just beyond the upper left edge of the frame while the comet is about 6.5 light-minutes from planet Earth. Near the western horizon after sunset and slightly easier to see in binoculars from the southern hemisphere, this comet SWAN will pass near Zubenelgenubi, alpha star of Libra, on October 2. C/2025 R2 (SWAN) is scheduled to make its closest approach to our fair planet around October 20.
© Team Ciel Austral