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Rosetta Comet is Darker than Charcoal
by Staff Writers
Pasadena CA (JPL) Sep 08, 2014

Artist's impression of the Rosetta orbiter at comet 67P/Churyumov-Gerasimenko. The image is not to scale. Image courtesy ESA/ATG Medialab.

Rosetta scientists also discovered the comet's surface so far shows no large water-ice patches. The team expected to see ice patches on the comet's surface because it is too far away for the sun's warmth to turn its water into vapor.

"We're a bit surprised at just how unreflective the comet's surface is and how little evidence of exposed water-ice it shows," said Alan Stern, Alice principal investigator at the Southwest Research Institute in Boulder, Colorado.

Alice is probing the origin, composition and workings of comet 67P/Churyumov-Gerasimenko, to gather sensitive, high-resolution insights that cannot be obtained by either ground-based or Earth-orbiting observation.

It has more than 1,000 times the data-gathering capability of instruments flown a generation ago, yet it weighs less than nine pounds (four kilograms) and draws just four watts of power. The instrument is one of two full instruments on board Rosetta that are funded by NASA. The agency also provided portions of two other instrument suites.

Other U.S. contributions aboard the spacecraft are the Microwave Instrument for Rosetta Orbiter (MIRO), the Ion and Electron Sensor (IES), part of the Rosetta Plasma Consortium Suite, and the Double Focusing Mass Spectrometer (DFMS) electronics package for the Rosetta Orbiter Spectrometer for Ion Neutral Analysis (ROSINA). They are part of a suite of 11 total science instruments aboard Rosetta.

MIRO is designed to provide data on how gas and dust leave the surface of the nucleus to form the coma and tail that gives comets their intrinsic beauty. IES is part of a suite of five instruments to analyze the plasma environment of the comet, particularly the coma.

To obtain the orbital velocity necessary to reach its comet target, the Rosetta spacecraft took advantage of four gravity assists (three from Earth, one from Mars) and an almost three-year period of deep space hibernation, waking up in January 2014 in time to prepare for its rendezvous with 67P/Churyumov-Gerasimenko.

Rosetta also carries a lander, Philae, which will drop to the comet's surface in November 2014.

The comet observations will help scientists learn more about the origin and evolution of our solar system and the role comets may have played in providing Earth with water, and perhaps even life.


Related Links
US instruments aboard Rosetta
Asteroid and Comet Mission News, Science and Technology

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Historic comet landing site to be unveiled on Sept 15
Paris (AFP) Sept 04, 2014
The European Space Agency (ESA) will on September 15 unveil which of five possible sites it has chosen for the first-ever landing of a probe from Earth on a comet, it said Thursday. "At present, the landing is scheduled for November 11," added an ESA statement. The agency's Rosetta spacecraft met up with Comet 67P/Churyumov-Gerasimenko last month after a 10-year chase through the Solar S ... read more

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