介绍莱纳德彗星
(原标题: Introducing Comet Leonard)
2021-11-21
浏览次数: 35
莱纳德彗星来了。彗星C/2021 A1（伦纳德）是在2021年1月经过火星时被发现的，当时它是一个微弱的污点——但它的轨道将把这个巨大的脱落的冰球带入太阳系内部，在12月经过地球和金星附近，然后在2022年1月初掠过太阳。虽然彗星是出了名的难以预测，但一些人估计伦纳德彗星会在12月变亮，肉眼就能看到。伦纳德彗星是在一个多星期前被捕捉到的，它已经呈现出一种绿色的昏迷状态和一条延伸的尘埃尾巴。这张特色图片是由62张通过中等大小的望远镜拍摄的图像组成的——一组曝光追踪彗星，另一组追踪背景恒星。这些照片是在美国加利福尼亚州琼湖附近的东塞拉斯山脉的黑暗天空中拍摄的。在12月中旬经过地球附近后不久，这颗彗星将从北方转向南方的天空。APOD编辑（RJN）周一在线：美国宇航局最佳太空图像（和视频）
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Here comes Comet Leonard. Comet C/2021 A1 (Leonard) was discovered as a faint smudge in January 2021 when it was out past Mars -- but its orbit will take the giant shedding ice-ball into the inner Solar System, passing near both Earth and Venus in December before it swoops around the Sun in early January 2022. Although comets are notoriously hard to predict, some estimations have Comet Leonard brightening to become visible to the unaided eye in December. Comet Leonard was captured just over a week ago already sporting a green-tinged coma and an extended dust tail. The featured picture was composed from 62 images taken through a moderate-sized telescope -- one set of exposures tracking the comet, while another set tracking the background stars. The exposures were taken from the dark skies above the Eastern Sierras (Mountains), near June Lake in California, USA. Soon after passing near the Earth in mid-December, the comet will shift from northern to southern skies. APOD Editor (RJN) Online Monday: NASA's Best Space Images (& Videos)
© Dan Bartlett