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Rosetta at a glance 
After entering orbit around Comet 67P/Churyumov-Gerasimenko in 2014, the spacecraft will release a small lander onto the icy nucleus, then spend the next two years orbiting the comet as it heads towards the Sun. On the way to Comet Churyumov-Gerasimenko, Rosetta will receive gravity assists from Earth and Mars, and will fly past main belt asteroids.
The main spacecraft, the orbiter, has dimensions of 2.8 x 2.1 x 2.0 metres, on which all subsystems and payload equipment are mounted. There are two 14-metre solar panels with a total area of 64 square metres. On one side of the orbiter is a 2.2-metre diameter communications dish – the steerable high-gain antenna. The lander is attached to the opposite face. Instruments The Rosetta orbiter has eleven scientific instruments:
The 100-kilogram Rosetta lander is provided by a European consortium under the leadership of the German Aerospace Research Institute (DLR). Other members of the consortium are ESA and institutes from Austria, Finland, France, Hungary, Ireland, Italy and the UK. Instruments The Rosetta lander has nine scientific instruments:-
Rosetta was launched as flight 158 on 2 March 2004 by an Ariane-5G rocket from Kourou, French Guiana. After burn-out of the lower stage, the spacecraft and upper stage remained in Earth parking orbit (4000 x 200 kilometres) for about two hours. Ariane's upper stage then ignited to boost Rosetta into its interplanetary trajectory, before separating from the spacecraft.
The payload weighs approximately 3000 kilograms (fully fuelled) including 1670 kilograms of propellant, 165 kilograms of scientific payload for the orbiter and 100 kilograms for the lander.
Rosetta's journey takes it out to 5.25 AU (about 790 million kilometres from the Sun).
The journey to Comet 67P/Churyumov-Gerasimenko lasts 10 years:
The orbiter continues to orbit Comet 67P/Churyumov-Gerasimenko, observing what happens as the icy nucleus approaches the Sun and then travels away from it. The mission ends in December 2015. Rosetta will once again pass close to Earth’s orbit, more than 4000 days after its adventure began.
Comet 67P/Churyumov-Gerasimenko has a nucleus about 4 kilometres wide. It orbits aroud the Sun every 6.6 years, between 186 million kilometres and 857 million kilometres from the Sun. It was discovered in 1969 by K. Churyumov (University of Kiev, Ukraine) and S. Gerasimenko (Institute of Astrophysics Dushanbe, Tajikistan)
Rosetta’s industrial team involves more than 50 contractors from 14 European countries and the United States. The prime spacecraft contractor is Astrium Germany. Major subcontractors are Astrium UK (spacecraft platform), Astrium France (spacecraft avionics) and Alenia Spazio (assembly, integration and verification). The 100-kilogram Rosetta lander is provided by a European consortium under the leadership of the German Aerospace Research Institute (DLR).
The cost of the Rosetta project is around 1000 million Euros (including the scientific instruments funded by national agencies)
Mission Operations Centre: European Space Operations Centre (ESOC), Darmstadt, Germany Prime Ground Station: New Norcia, near Perth, Australia Science Operations Centre: Collocated at ESOC (Darmstadt, Germany) and ESTEC (Noordwijk, Netherlands) Lander Control Centre: DLR, Cologne, Germany Lander Science Centre: CNES, Toulouse, France
Planned operational duration: 12 years Last update: 17 November 2009
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