First study : water ice
The first work, carried out by S. Fornasier, astrophysicist at the Paris Observatory and lecturer at the University, highlights, thanks to the data furnished by the imaging system OSIRIS, seasonal and even daily colour variations of the nucleus.

Second study : carbon ice
Thanks to the data furnished by the spectro-imager VIRTIS, a second piece of research to which have contributed scientists from the Paris Observatory highlights the first ever dection of CO2 ice on the surface of a cometary nucleus.
- Read the full paper->art3543]