A basic timeline illustrating milestones from Rosetta's launch to its encounter with the comet 67P/Churyumov-Gerasimenko.
Rosetta is a mission of the European Space Agency, Paris, with contributions from its member states and NASA. Rosetta's Philae lander is provided by a consortium led by the German Aerospace Center, the Max Planck Institute for Solar System Research, the French National Space Agency and the Italian Space Agency. NASA's Jet Propulsion Laboratory, Pasadena, Calif., manages the U.S. contribution to the Rosetta mission for NASA's Science Mission Directorate in Washington. The Microwave Instrument for the Rosetta Orbiter was built at JPL, and JPL is home to its principal investigator, Samuel Gulkis. The Southwest Research Institute, San Antonio, developed the Rosetta orbiter's Ion and Electron Sensor (IES) and is home to its principal investigator, James Burch. The Southwest Research Institute, Boulder, Colo., developed the Alice instrument and is home to its principal investigator, Alan Stern.