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OUTER PLANETS
New Horizons Becomes Closest Spacecraft to Approach Pluto
by Staff Writers
Laurel MD (SPX) Dec 05, 2011


Pluto View (circa 2007): New Horizons' current view of Pluto still resembles this image snapped by the spacecraft's long-range telescopic camera four years ago; that will change exponentially beginning in late 2014, as New Horizons speeds closer and closer to its target planet and its cameras begin to resolve details.

NASA's New Horizons mission reached a special milestone this past week on its way to reconnoiter the Pluto system, coming closer to Pluto than any other spacecraft.

It's taken New Horizons 2,143 days of high-speed flight - covering more than a million kilometers per day for nearly six years-to break the closest-approach mark set by NASA's Voyager 1 in January 1986.

Pluto wasn't on Voyager's mission path, but after making historic flybys of Jupiter in 1979 and Saturn in 1980, the intrepid probe came about 983 million miles (1.58 billion kilometers) from Pluto as it raced to the solar system's outskirts.

Now New Horizons, which is healthy, on course and closer to Pluto than Voyager ever came, will continue to set proximity-to-Pluto records every day until its closest approach - about 7,767 miles (12,500 kilometers) from the planet - on July 14, 2015.

"We've come a long way across the solar system," says Glen Fountain, New Horizons project manager at the Johns Hopkins University Applied Physics Laboratory.

"When we launched [on Jan. 19, 2006] it seemed like our 10-year journey would take forever, but those years have been passing us quickly. We're almost six years in flight, and it's just about three years until our encounter begins."

From New Horizons' current distance to Pluto - as far as Earth is (on average) from Saturn - Pluto remains just a faint point of light. But by the time New Horizons sails through the Pluto system in mid-2015, the planet and its moons will be so close that the spacecraft's cameras will spot features as small as a football field.

"What a cool milestone!" says New Horizons Principal Investigator Alan Stern, of the Southwest Research Institute. "Although we're still a long way - 1.5 billion kilometers from Pluto - we're now in new territory as the closest any spacecraft has ever gotten to Pluto, and getting closer every day by over a million kilometers.

"I wonder how long it will be until the next Pluto spacecraft - perhaps a future orbiter or lander - crosses this distance marker?" he continues. "It could be decades."

New Horizons is currently in hibernation, with all but its most essential systems turned off, speeding away from the Sun at more than 34,500 miles (55,500 kilometers) per hour. Operators at the Applied Physics Lab will "wake" the spacecraft in January for a month of testing and maintenance activities.

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Related Links
New Horizons at APL
The million outer planets of a star called Sol






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OUTER PLANETS
Pluto's Hidden Ocean
Moffett Field CA (SPX) Nov 18, 2011
When NASA's New Horizons cruises by Pluto in 2015, the images it captures could help astronomers determine if an ocean is hiding under the frigid surface, opening the door to new possibilities for liquid water to exist on other bodies in the solar system. New research has not only concluded such an ocean is likely, but also has highlighted features the spacecraft could identify that could help c ... read more


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