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Pluto-Bound Probe Passes Mars’ Orbit

New Horizons Pluto Probe Readied For Launch
To be dispatched early 2006, the outward bound New Horizons spacecraft will throw new light on distant Pluto and its moon, Charon, as well as Kuiper Belt objects. Image (Image credit: Dan Durda)

NASA's NewHorizons probe has left the inner planets of the Solar System behind as it streakstoward a rendezvous with Pluto and its moons.

The spacecraft, billed as NASA'sfastest-flying probe, hurtled past the orbit of Mars - though not the planetitself - Friday on its way towards a Jupiter flyby and its more distant target Pluto.

"It'spretty amazing," New Horizons principal investigator AlanStern told "It'sa straight line across the Solar System. There are hardly any curves becausethis is so fast."

New Horizons sped past Mars'orbit some 151 million miles (243 million kilometers) from the Sun at a rate ofabout 13 miles (21 kilometers) per second. The red planet, however, trailedbehind the spacecraft at a distance of about 186 million miles (299 millionkilometers), mission managers said, adding that New Horizons was closer toEarth than Mars.

NASA launchedNew Horizons, a piano-sized spacecraft weighing about 1,054 pounds (478 kilogram),atop a Lockheed Martin-built Atlas 5 rocket - its most powerful booster - to flingthe Pluto-probe spaceward on Jan. 19, 2006.

Six of the probe's seven scienceinstruments have already been checkedfor their health as the spacecraft heads towards Jupiter, where it will usethe giant planet's gravity to boost its way on to Pluto and the icyobject-filled Kuiper Belt.

But first, the spacecraft must passthrough the AsteroidBelt, which despite its reputation is primarily made up of empty spacerather than a teeming rock field, mission managers said.

"We won't be hit," said Stern, theexecutive director of the space science and engineering division at theSouthwest Research Institute in Boulder, Colorado. "We won't even come closeenough to make any useful science observations of asteroids. They're reallyvery far apart."

New Horizons is expected to fly pastPluto and its moons July 2015. The spacecraft is due to make its closestapproach to Jupiter on Feb. 28, 2007.

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