墨西哥上空的新彗星SWAN25B
(原标题: New Comet SWAN25B over Mexico)
2025-09-16
浏览次数: 1591
用双筒望远镜已经可以看到一颗新发现的彗星。这颗彗星名为C/2025 R2 (SWAN)，绰号为SWAN25B，当它从太阳的方向出现时，它的亮度显著提高，可能很快就会在你的智能手机上看到——如果不是你的眼睛的话。虽然彗星的亮度是出了名的难以预测，但许多彗星在接近地球时显得更亮，10月19日左右，SWAN25B的亮度仅为地日距离的四分之一。10月5日左右，当地球经过这颗彗星的轨道平面时，夜间的天文观测者也将看到由swan25b产生的流星雨。这颗意外明亮的彗星是由一位业余天文学家在美国宇航局SOHO卫星上的SWAN仪器拍摄的图像中发现的。这颗彗星目前在南方的天空最容易观测到，但它正在慢慢向北移动。这张特色照片是三天前在墨西哥萨卡特卡斯西部地平线上拍摄的。
查看原文解释
A newly discovered comet is already visible with binoculars. The comet, C/2025 R2 (SWAN) and nicknamed SWAN25B, is brightening significantly as it emerges from the Sun's direction and might soon become visible on your smartphone -- if not your eyes. Although the brightnesses of comets are notoriously hard to predict, many comets appear brighter as they approach the Earth, with SWAN25B reaching only a quarter of the Earth-Sun distance near October 19. Nighttime skygazers will also be watching for a SWAN25B-spawned meteor shower around October 5 when our Earth passes through the plane of the comet's orbit. The unexpectedly bright comet was discovered by an amateur astronomer in images of the SWAN instrument on NASA's SOHO satellite. The comet is currently best observed in southern skies but is slowly moving north. The featured image was captured at sunset three days ago just above the western horizon in Zacatecas, Mexico.
© Daniel Korona