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File:PIA00064 Neptune's Dark Spot (D2), 1989.jpg

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English: This bulls-eye view of Neptune's small dark spot (D2) was obtained by Voyager 2's narrow-angle camera on Aug. 24, 1989, when Voyager 2 was within 1.1 million km (680,000 miles) of the planet. The smallest structures that can be seen are 20 km (12 miles) across. This unplanned photograph was obtained when the infrared spectrograph was mapping the planet, and is the highest resolution view of the feature taken during the flyby. Banding surrounding the feature indicates unseen strong winds, while structures within the bright spot suggest both active upwelling of clouds and rotation about the center. A rotation rate has not yet been measured, but the V-shaped structure near the right edge of the bright area indicates that the spot rotates clockwise. Unlike the Great Red Spot on Jupiter, which rotates counterclockwise, if the D2 spot on Neptune rotates clockwise, the material will be descending in the dark oval region. The fact that infrared data will yield temperature information about the region above the clouds makes this observation especially valuable.
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Source http://photojournal.jpl.nasa.gov/catalog/PIA00064 (direct link)
Author NASA/JPL
This image or video was catalogued by Jet Propulsion Laboratory of the United States National Aeronautics and Space Administration (NASA) under Photo ID: PIA00064.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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24 August 1989

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Date/TimeThumbnailDimensionsUserComment
current12:59, 10 October 2008Thumbnail for version as of 12:59, 10 October 2008934 × 722 (133 KB)MER-C{{Information |Description=Neptune's w:Small Dark Spot in (comparably) high resolution. |Source={{NASA-image|id=PIA00064|center=JPL}} |Date=24 August 1989 |Author=Voyager 2 |Permission=Public domain |other_versions=See http://photojournal.jpl.nasa.gov

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