NASAのインスタグラム(nasa) - 1月16日 11時46分

Our Near-Earth Object Wide-field Survey Explorer (NEOWISE) spacecraft discovered and characterized 40 near-Earth objects (NEOs) in the first year after the mission was re-started in December 2013. Eight of the discoveries have been classified as potentially hazardous asteroids (PHAs), based on their size and how close their orbits could come to Earth's orbit. The mission has further observed and characterized 245 previously known near-Earth objects. It also sees comets. Comet C/2014 Q2 (Lovejoy) is one of more than 32 comets imaged by our NEOWISE mission from December 2013 to December 2014. This image of comet Lovejoy combines a series of observations made in November 2013, when comet Lovejoy was 1.7 astronomical units from the sun. (An astronomical unit is the distance between Earth and the sun.) Image credit: NASA/JPL-Caltech

#nasa #neowise #lovejoy #comet #neo #space #science

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