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Mercury (Planet): Images
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Lukyanov, A. V., O. Umnova, and S. Barabash, Energetic neutral atom imaging of Mercury's magnetosphere 1. Distribution of neutral particles in an axially symmetrical exosphere, Planet. Space Sci., 49(14-15), 1669, 2001. doi:10.1016/S0032-0633(01)00105-2
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* Telescopic observations of Mercury are very difficult, since Mercury never moves farther away from the Sun in the Earth's sky than 27 degrees. This means observations always have to be made at low inclination, with the image passed through an extended thickness of atmosphere that distorts it badly.
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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.
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