Article Posted on : - Oct 01, 2008

NASA's Messenger spacecraft will make its second flyby of Mercury Oct. 6. The desk-sized spacecraft will settle into Mercury orbit in 2011 after having made 15 loops around the sun since its 2004 launch. Image courtesy NASA.

NEW YORK (BNS): NASA's Messenger spacecraft would make its second flyby of the mysterious, rocky planet on October 6. Traveling at a mind-blowing 4.2 miles per second, the spacecraft will dip within 124 miles of Mercury, the planet closest to the Sun, and image much of the surface never before seen.

As Messenger pulls away from the planet it will view a region seen at high resolution only once before -- when NASA's Mariner 10 spacecraft made three flybys in 1974 and 1975, said senior research associate William McClintock, a mission co-investigator from Colorado University-Boulder's Laboratory for Atmospheric and Space Physics.

Launched in August 2004, Messenger will make the last of three passes by Mercury -- the closest planet to the sun -- in October 2009 before finally settling into orbit around it in 2011.

The circuitous, 4.9 billion-mile-journey to Mercury requires more than six years and 15 loops around the sun to guide it closer to Mercury's orbit. McClintock led the development of CU-Boulder's Mercury Atmospheric and Surface Composition Spectrometer, or MASCS, miniaturized to weigh less than seven pounds for the arduous journey.

The craft is equipped with a large sunshade and heat-resistant ceramic fabric to protect it from the sun, and more than half of the weight of the 1.2-ton spacecraft at launch consisted of propellant and helium. "We are almost two-thirds of the way there, but we still have a lot of work to do," said McClintock. "We are continually refining our game plan, including developing contingencies for the unexpected."

The desk-sized Messenger spacecraft is carrying seven instruments -- a camera, a magnetometer, an altimeter and four spectrometers. Data from MASCS earlier this year during the first flyby January 14 provided LASP researchers with evidence that about 10 percent of the sodium atoms ejected from Mercury's hot surface during the daytime were accelerated into a 25,000-mile-long sodium tail trailing the planet, McClintock said.

The spacecraft will take data and images from Mercury for about 90 minutes on October 6, when LASP will turn on a detector in MASCS for its first look at Mercury's surface in the far ultraviolet portion of the light spectrum, said McClintock. The scanner will look at reflected light from Mercury's surface to better determine the mineral composition of the planet.

"We got some surprising results with our UV detector in January, and we hope to see additional surprises as we extend our observations further into the ultraviolet," he said.

The second Mercury flyby is slated for 2.40 am MDT on October 6. Date from the mission will be used to study Mercury's magnetic field and its interaction with the solar wind.