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Rosetta monitors Deep Impact
 
20 June 2005

Rosetta spacecraft
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Credits: ESA/AOES Medialab
 
 
ALICE
The ALICE ultraviolet imaging spectrometer analyses gases in the coma and tail and measures the comet’s production rates of water and carbon monoxide/dioxide. Also provides information on the surface composition of the nucleus.

The orbiter's scientific payload includes 11 experiments, in addition to the Lander. Scientific consortia from institutes across Europe and the United States have provided these state-of-the-art instruments. All of them are located on the side of the spacecraft that will permanently face the comet during the main scientific phase of the mission.

Credits: ESA/AOES Medialab

 
 
Deep Impact Spots Quarry
Sixty-nine days before it gets up-close-and-personal with a comet, NASA's Deep Impact spacecraft successfully photographed its quarry, Comet 9P/Tempel 1, at a distance of about 60 million kilometres. The image, taken on 25 April 2005, is the first of many comet portraits Deep Impact will take leading up to its historic comet encounter on 4 July.

At the distance of the comet, each pixel is about 600 km across, so the coma is quite extensive. This was a great milestone for the project. Although many images of the comet have been taken by Earth-based observers, including amateurs, this was the first one taken by the spacecraft. In this orientation, north is at the bottom and east is on the right.

Credits: NASA/JPL/UMD

 
 
ESA's comet chaser
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