Skip to main content

NASA's Mercury Spacecraft Gets a Life 'Boost'

Mercury Seen by Messenger in 2013
A far-off view of Mercury taken by the orbiting MESSENGER spacecraft on April 23, 2013. (Image credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)

Engineers have figured out a way to buy some time for NASA's Mercury-orbiting MESSENGER spacecraft, which was due to end its four-year mission with a suicidal plunge into the innermost planet in March.

Launched in 2004, MESSENGER — an acronym for Mercury Surface, Space Environment, Geochemistry and Ranging — is about out of hydrazine fuel for its steering thrusters. The spacecraft became the first to put itself into orbit around Mercury in March 2011.

NEWS: Help NASA Spacecraft Name Mercury's Craters

It's already flying quite low. Engineers estimate its altitude will be just 15 miles above the surface on Jan 21. But on that day, despite its empty gas tan, MESSENGER will attempt a reboost. Engineers instead devised a maneuver using leftover helium from the system that keeps the propulsion system pressurized. [Stunning Mercury Photos by NASA's MESSENGER]

"To my knowledge this is the first time that helium pressurant has been intentionally used as a cold-gas propellant through hydrazine thrusters," MESSENGER lead propulsion engineer Stewart Bushman, with Johns Hopkins University Applied Research Laboratory, said in a statement. 

NEWS: Spacecraft Watched the Lunar Eclipse from Mercury

With its low mass, helium "doesn't get you much bang for your buck," he added.

But the boost should buy scientists about another month of time to learn about variations in Mercury's internal magnetic field and study water ice inside craters in the planet's northern latitudes.

This article was provided by Discovery News.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: