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Maximum Surface Temperature near the North Pole
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Maximum Surface Temperature near the North Pole

December 10, 2012
Release Date: November 30, 2012 Topics: HD Resolution Images, MLA, NASA Press Conference 11/29/12, Polar Date Presented: November 29, 2012, at a NASA press conference Instrument: Mercury Laser Altimeter (MLA) Of Interest: Map of the maximum surface temperature reached over a two-year period over the north polar region of Mercury. This detailed thermal map of Mercury, and others that display additional thermal parameters, are the first to have been calculated from measurements of Mercury’s topography by the MESSENGER MLA instrument. Mercury displays the most extreme range of surface temperatures of any body in the Solar System. Regions that receive direct sunlight at the equator reach maximum temperatures of 700 K (800° F), whereas regions in permanent shadow in high-latitude craters can drop below 50 K (-370° F). In this view from above Mercury's north pole, there are numerous craters with poleward-facing slopes on which the annual maximum temperature is less than 100 K (-280° F). At these temperatures, water ice is thermally stable over billion-year timescales. The MESSENGER spacecraft is the first ever to orbit the planet Mercury, and the spacecraft's seven scientific instruments and radio science investigation are unraveling the history and evolution of the Solar System's innermost planet. Visit the Why Mercury? section of this website to learn more about the key science questions that the MESSENGER mission is addressing. During the one-year primary mission, MESSENGER acquired 88,746 images and extensive other data sets. MESSENGER is now in a yearlong extended mission, during which plans call for the acquisition of more than 80,000 additional images to support MESSENGER's science goals. Credit: NASA/UCLA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington