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Monday, June 25 2018 @ 03:41 am EDT

NASA Helps Europe Study a Comet -- Up Close and Personal

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Rosettaís lander Philae will eject from the spacecraft, touch down on the cometís nucleus, and immediately fire a harpoon into the surface to anchor itself so it wonít drift off in the weak gravity.
Click image for larger view
Europeís Rosetta spacecraft is on its way to intercept comet 67P/Churyumov-Gerasimenko. Comets have been intercepted before, but this mission is different. Rosetta aims to make history by landing a probe on the cometís surface while the mother ship orbits overhead.

“Rosetta is the European equivalent of a NASA flagship mission,” explains Claudia Alexander, project scientist for the U.S. Rosetta Project at NASA's Jet Propulsion Laboratory. “It will conduct the most comprehensive study of a comet ever performed.”

Rosettaís payload contains 21 instruments (11 on the orbiter, 10 on the lander) designed to study almost every aspect of the cometís chemistry, structure, and dynamics. Three of the sensors were contributed by the U.S.: Alice (an ultraviolet spectrometer), IES (an ion and electron sensor), and MIRO (a microwave sounder).

The main event of the mission will likely be the landing. The 100-kg lander, which looks a bit like a cross between NASAís old Viking Mars landers and a modern microsatellite, will spend two weeks fastened to the cometís icy surface. The European-built probe will collect samples for analysis by onboard microscopes and take stunning panoramic images from ground level.

“First the lander will study the surface from close range to establish a baseline before the comet becomes active,” explains Alexander. “Then the orbiter will investigate the flow of gas and dust around the comet's active, venting nucleus.”

Rosettaís sensors will perform the experiments that reveal how the chemicals present interact with one another and with the solar wind. Alice and MIRO detect uncharged atoms and molecules, while IES detects the ions and electrons as the solar wind buffets the nucleus.

One problem that often vexes astronomers when they try to study comets is visibility. Itís hard to see through the dusty veil of gas billowing away from the heated nucleus. The microwaves MIRO detects can penetrate the dust, so MIRO can see and measure its target molecules even when other instruments canít.

MIRO is one of several experiments focused on the cometís structural properties. It will determine the cometís dielectric constant, emissivity, and thermal conductivity to determine whether it is made of a powdery loose material, has a detectable layer of loose material, or is hard as rock.

“We want to find out whether comets have retained material from when the solar system formed,” says Alexander. “If the ancient materials are still there, we can get an idea of what conditions were like at the dawn of the solar system.”

Rosetta enters orbit in 2014. Stay tuned for updates!

Check out “Comet Quest,” the new, free iPhone/iPad game that has you operating the Rosetta spacecraft yourself. Get the link at spaceplace.nasa.gov/comet-quest.

This article was provided by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
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