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The first glimpse of Mercury’s horizon
|| 1/17/2008 || 5:55 pm || Comments Off on The first glimpse of Mercury’s horizon || ||

As the MESSENGER spacecraft drew closer to Mercury for its historic first flyby, the spacecraft’s Narrow Angle Camera (NAC) on the Mercury Dual Imaging System (MDIS) acquired an image mosaic of the sunlit portion of the planet. This image is one of those mosaic frames and was acquired on January 14, 2008, 18:10 UTC, when the spacecraft was about 18,000 kilometers (11,000 miles) from the surface of Mercury, about 55 minutes before MESSENGER’s closest approach to the planet.

The image shows a variety of surface textures, including smooth plains at the center of the image, many impact craters (some with central peaks), and rough material that appears to have been ejected from the large crater to the lower right. This large 200-kilometer-wide (about 120 miles) crater was seen in less detail by Mariner 10 more than three decades ago and was named Sholem Aleichem for the Yiddish writer. In this MESSENGER image, it can be seen that the plains deposits filling the crater’s interior have been deformed by linear ridges. The shadowed area on the right of the image is the day-night boundary, known as the terminator. Altogether, MESSENGER acquired over 1200 images of Mercury, which the science team members are now examining in detail to learn about the history and evolution of the innermost planet.

Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

As I mentioned the other day, the MESSENGER spacecraft started to document the planet Mercury. Since this is the first time in my entire life that contact has been made with the planet, I find these pictures quite intriguing.



Post Title: The first glimpse of Mercury’s horizon
Posted in: Astronomy, Celestial, Location, Mercury, NASA, Space



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