Mercury Messenger Flyby Today

The NASA Messenger project to Mercury is getting ready for the next big achievement, the closest ever [124 miles] flyby of the planet Mercury. This is just the prelude to the planned 2011 orbit of Mercury by the same spacecraft, after it takes another three years to circle back around.

As we await the new pictures about three hours from now, our kudos go out to NASA and the JPL project team. Mankind is still reaching [only as we are able, at this point] for the stars, and we wish them all the best.

For the latest, visit the project web site:

The latest press release:

“Today, January 14, 2008, at 19:04:39 UTC (2:04:39 pm EST), MESSENGER will experience its closest approach to Mercury, passing just 200 kilometers (124 miles) above the planet’s surface. As the MESSENGER spacecraft continues to speed toward Mercury, the Narrow Angle Camera, part of the Mercury Dual Imaging System (MDIS) instrument, acquired this crescent view of Mercury. The image was taken on January 13, 2008, when the spacecraft was at a distance of about 760,000 kilometers (470,000 miles) from Mercury. Mercury is about 4880 kilometers (about 3030 miles) in diameter, and the smallest feature visible in this image is about 20 kilometers (12 miles) across.

During the historic flyby encounter today, extensive scientific data will be gathered. The MDIS instrument will acquire over 1200 images of Mercury, including images of portions of the surface never before viewed by a spacecraft. The MDIS instrument is just one member of a whole suite of instruments that will be used to study Mercury during the flyby. The Mercury Atmospheric and Surface Composition Spectrometer (MASCS) will observe Mercury’s surface as well as its tenuous atmosphere. The MESSENGER Magnetometer (MAG) will accurately measure Mercury’s magnetic field, and the Energetic Particle and Plasma Spectrometer (EPPS) will characterize Mercury’s space environment and interactions with the solar wind. The Mercury Laser Altimeter (MLA) will sense surface topography along a narrow profile. The Gamma-Ray and Neutron Spectrometer (GRNS) and X-Ray Spectrometer (XRS) will make the first measurements of Mercury¬ís surface elemental composition.

MESSENGER will begin to transmit the new data to Earth once all of the scientific measurements are completed, about 22 hours after the spacecraft’s closest approach to Mercury. These flyby data will shed light on fundamental scientific questions related to the formation and evolution of the planet Mercury. As scientists analyze the data, the MESSENGER spacecraft will continue on its planned journey, which includes two more encounters of Mercury in October 2008 and September 2009, before entering an orbit around Mercury in March 2011.

Image acquired on January 13, 2008, 06:34 UTC.
Mercury, 2008
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

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