tóng-àn:PIA22419-Neowise-1stFourYearsDataFromDec2013-20180420.gif

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PIA22419-Neowise-1stFourYearsDataFromDec2013-20180420.gif ‎（730 × 548 siōng-sò͘ , tóng-àn chiàm-liōng: 3.54 MB, MIME luī-hêng: image/gif, 循環, 47 畫格, 4.7秒）

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This movie shows the progression of NASA's Near-Earth Object Wide-field Survey Explorer (NEOWISE) investigation for the mission's first four years following its restart in December 2013. Green dots represent near-Earth objects. Gray dots represent all other asteroids which are mainly in the main asteroid belt between Mars and Jupiter. Yellow squares represent comets.

Since the mission was restarted in December 2013, after a period of hibernation, the asteroid- and comet-hunter has completely scanned the skies nearly eight times and has observed and characterized 29,375 objects in four years of operations. This total includes 788 near-Earth objects and 136 comets since the mission restart.

JPL manages NEOWISE for NASA's Science Mission Directorate at the agency's headquarters in Washington. The Space Dynamics Laboratory in Logan, Utah, built the science instrument. Ball Aerospace & Technologies Corp. of Boulder, Colorado, built the spacecraft. Science operations and data processing take place at the Infrared Processing and Analysis Center at the California Institute of Technology in Pasadena. Caltech manages JPL for NASA.
Ji̍t-kî (published)
Chhut-chhù Catalog page · Full-res (GIF)
Chok-chiá NASA/JPL-Caltech/PSI
本圖像或影音收錄於美國國家航空暨太空總署 （NASA）噴射推進實驗室（Jet Propulsion Laboratory），其照片編號為： PIA22419

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Near-Earth Object Wide-field Survey Explorer
Credit and attribution belongs to the mission team, if not already specified in the "author" row

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Public domain 本作品由NASA創作，屬於公有領域。根據NASA的版權政策：“NASA的創作除非另有聲明否則不受版權保護。”（參見：Template:PD-USGov/zh，NASA版權政策或JPL圖像使用政策）
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