2020 March 15
The Snows of Churyumov-Gerasimenko
Images Credit: ESA, Rosetta, MPS, OSIRIS; UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA;Animation: Jacint Roger Perez
Explanation: You couldn’t really be caught in this blizzard while standing by a cliff on Churyumov-Gerasimenko. Orbiting the comet — frequently abbreviated as 67P or CG — in June of 2016, the Rosetta spacecraft’s narrow angle camera did record streaks of dust and ice particles — similar to snow — as they drifted across the field of view near the camera and above the comet’s surface. Some of the bright specks in the scene, however, are likely due to a rain of energetic charged particles or cosmic rays hitting the camera, and the dense background of stars in the direction of the constellation of the Big Dog (Canis Major). In the featured video, these background stars are easy to spot trailing from top to bottom. The stunning movie was constructed from 33 consecutive images taken over 25 minutes while Rosetta cruised some 13 kilometers from the comet’s nucleus.
Tomorrow’s picture: almost saturn
丘澤彗星的雪季
影像提供: ESA , Rosetta , MPS , OSIRIS; UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA;動畫製作: Jacint Roger Perez
說明: 當你站在丘澤彗星的懸崖上時，並不會被這場暴風雪所困。在2016年6月繞行這顆彗星（簡稱67P）時，羅塞塔號太空船的窄視角相機，記錄到看來像降雪的塵埃和冰粒，飄過彗星表面上方的相機視野裡。影像裡的條狀光痕，部分可能源自打到相機的帶電粒子或宇宙射線，以及大犬座方向密密麻麻的背景恆星。在主題影片裡，背景恆星輕易可辨，因為它們產生的光痕是由上而下。這部精采的縮時動畫，建構自羅塞塔號飛行在這顆彗星的核心上方，高度約13公里時，於25分鐘期間所拍攝的33張系列照片。
明日的圖片: almost saturn
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