Sharpest Ultima Thule


   2019-02-28 丨 天文·每日一图 丨 nasachina  丨  No Comment 丨  66

当前位置: 首页  >  天文·每日一图  >  Sharpest Ultima Thule

2019 February 28

Sharpest Ultima Thule
Image Credit:
NASA, Johns Hopkins University APL, Southwest Research Institute, National Optical Astronomy Observatory

Explanation: On January 1, New Horizons swooped to within 3,500 kilometers of the Kuiper Belt world known as Ultima Thule. That's about 3 times closer than its July 2015 closest approach to Pluto. The spacecraft's unprecedented feat of navigational precision, supported by data from ground and space-based observing campaigns, was accomplished 6.6 billion kilometers (over 6 light-hours) from planet Earth. Six and a half minutes before closest approach to Ultima Thule it captured the nine frames used in this composite image. The most detailed picture possible of the farthest object ever explored, the image has a resolution of about 33 meters per pixel, revealing intriguing bright surface features and dark shadows near the terminator. A primitive Solar System object, Ultima Thule's two lobes combine to span just 30 kilometers. The larger lobe, referred to as Ultima, is recently understood to be flattened like a fluffy pancake, while the smaller, Thule, has a shape that resembles a dented walnut.

声明:NASA中文|版权所有,违者必究|如未注明,均为原创|本网站采用BY-NC-SA协议进行授权

转载:转载请注明原文链接 - Sharpest Ultima Thule


保护地球,探索宇宙,发现文明