伦纳德彗星在星团M3之前
(原标题: Comet Leonard Before Star Cluster M3)
2021-12-12
浏览次数: 36
伦纳德彗星现在可以用肉眼看到了——但只是勉强看得见。这颗彗星今天离地球最近，在本周太阳落山后不久，在地平线的低处，朝向西方，最适合观赏。目前在北半球最容易看到这颗彗星，到12月下旬，这颗彗星将在地球赤道以南最容易看到。彗星C/2021 A1（伦纳德）的特色图像是一周前在美国加利福尼亚州拍摄的。这张深度曝光的照片非常详细地显示了彗星的绿色气体彗发和正在形成的尘埃尾巴。这颗彗星穿过我们的内太阳系，距离我们只有几分钟的距离，它被捕捉到几乎从球状星团M3的前面经过。相比之下，M3距离我们大约35000光年。一周后，伦纳德彗星将异常接近金星，但将继续前进，并在1月初到达离太阳最近的地方。
查看原文解释
Comet Leonard is now visible to the unaided eye -- but just barely. Passing nearest to the Earth today, the comet is best seen this week soon after sunset, toward the west, low on the horizon. Currently best visible in the north, by late December the comet will best be seen from south of Earth's equator. The featured image of Comet C/2021 A1 (Leonard) was taken a week ago from California, USA. The deep exposure shows in great detail the comet's green gas coma and developing dust tail. The comet -- across our inner Solar System and only light-minutes away -- was captured passing nearly in front of globular star cluster M3. In contrast, M3 is about 35,000 light-years away. In a week, Comet Leonard will pass unusually close to Venus, but will continue on and be at its closest to the Sun in early January.
© Dan Bartlett