Comet Probe Photographs Earth During Flyby

Comet Probe Photographs Earth During Flyby
The Optical Spectroscopic and Infrared Remote Imaging System (OSIRIS) camera on board Rosetta observed Earth during its swing-by on Nov. 13, 2007.
(Image: © ESA/OSIRIS TEAM/MPS.)

A Europeanprobe hunting down a distant comet has beamed back the first images of itsTuesday swing by the planet Earth.

TheEuropean Space Agency?s (ESA) Rosetta spacecraft flew past Earth for the secondtime at about 3:57 p.m. EST (2057 GMT) to nab aspeed boost for the 4.4 billion-mile (7.1 billion-kilometer) trek to thecomet 67/P Churyumov-Gerasimenko.

?The spacecraft will now be catapulted towards the outer solarsystem with its newly-gained energy before coming back to Earth for anotherboost,? ESA officials said in a post-flyby announcement.

Rosetta?sfirst images of its second Earth flyby were recorded by the probe?s navigationcamera and other instruments to reveal its homeplanet in color and a crescent moon in starkblack and white. Views of GrahamLand, Antarctica and a monochrome look at the limbof the Earth were among pictures released today.

Accordingto its flight plan, Rosetta will turn its camera eye on the moon as it departsEarth today. As the probe flies further out, it will look back at the Earth-moonsystem, mission managers said.

Tuesday?sEarth flyby brought Rosetta within 3,290 miles (5,295 kilometers)of the planet's surface and marked Rosetta?s third planetary pass to gain agravity assist for its planned 2014 comet rendezvous. The probe carries a smalllander, dubbed Philae, designed to touch down on 67/PChuryumov-Gerasimenko to take a closer look at the icy wanderer.

The probelaunched in March 2004 and firstflew by Earth one year later before swinging past Mars on Feb. 27 this year.The flybys allow Rosetta to steal a bit of speed from the orbital momentum ofeach planet as it uses gravity to slingshot across the solar system. It wasflying at about 27,961 mph (45,000 kph) as it left the Earth late Tuesday, officialssaid.

Rosettawill return for yet another Earth boost Nov. 13, 2009, after visiting anasteroid called Steins in September 2008.

Rosettaresearchers, meanwhile, are looking forward to sifting through the datacollected by the comet probe?s instruments during the Earth flyby, the ESAsaid.

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