2025年11月21日
3I/ATLAS: A View from Planet Earth
Image Credit & Copyright: Rolando Ligustri
Explanation: Now outbound after its perihelion or closest approach to the Sun on October 29, Comet 3I/ATLAS is only the third known interstellar object to pass through our fair Solar System. Its greenish coma and faint tails are seen against a background of stars in the constellation Virgo in this view from planet Earth, recorded with a small telescope on November 14. But this interstellar interloper is the subject of an on-going, unprecedented Solar System-wide observing campaign involving spacecraft and space telescopes from Earth orbit to the surface of Mars and beyond. And while the comet from another star-system has recently grown brighter, you’ll still need a telescope if you want to see 3I/ATLAS from planet Earth. It’s now above the horizon in November morning skies and will make its closest approach to Earth, a comfortable 270 million kilometers distant, around December 19.
Tomorrow’s picture: Dione and Rhea Ring Transit
彗星3I/ATLAS: 来自地球的观察
影像提供与版权: Rolando Ligustri
说明: 彗星3I/ATLAS于10月29日过近日点（即距离太阳最近的点）后，目前正逐渐远离太阳，这是已知第三颗穿越我们美丽太阳系的星际天体。在这幅以小望远镜摄于11月14日来自地球的观测照片中，彗星的绿色彗发和微弱的彗尾映衬在室女座的星空背景中。然而，这位星际访客正成为一项史无前例的太阳系观测计划的主题，这项计划动用了从地球轨道到火星表面乃至更远行星的航天器和太空望远镜进行观测。虽然这颗来自其他恒星系统的彗星最近亮度有所增加，但如果你想从地球上观测彗星3I/ATLAS，仍然需要使用望远镜。目前，它已出现在11月的晨空中，并将于12月19日左右到达距离地球最近的点，距离约为2.7亿公里。
明日的图片: Dione and Rhea Ring Transit
