Rosetta orbiting the comet 67P/Churymov–Gerasimenko. Credit: ESA

With the Philae lander’s mission complete, Rosetta will now continue its own extraordinary exploration, orbiting Comet 67P/Churymov–Gerasimenko during the coming year as the enigmatic body arcs ever closer to our Sun.

Last week, ESA’s Rosetta spacecraft delivered its Philae lander to the surface of the comet for a dramatic touchdown– the first probe ever to land on the surface of a comet. Philae performed science measurements before going into hibernation, and initial data suggests the lander found organic molecules in the comet’s atmosphere and discovered the comet’s frigid surface is as hard as ice.

The lander’s planned mission ended after about 64 hours when its batteries ran out, but not before it delivered a full set of results that are now being analyzed by scientists across Europe.

Rosetta’s own mission is far from over and the spacecraft remains in excellent condition, with all of its systems and instruments performing as expected.

“With lander delivery complete, Rosetta will resume routine science observations and we will transition to the ‘comet escort phase’,” says Flight Director Andrea Accomazzo.

“This science-gathering phase will take us into next year as we go with the comet towards the Sun, passing perihelion, or closest approach, on 13 August, at 186 million kilometers from our star.”

On 16 November, the flight control team moved from the large Main Control Room at ESA’s Space Operations Centre in Darmstadt, Germany, where critical operations during landing were performed, to a smaller Dedicated Control Room, from where the team normally flies the craft.

Since then, Rosetta has performed a series of maneuvers, using its thrusters to begin optimizing its orbit around the comet for the 11 scientific instruments.

With the landing performed, all future trajectories are designed purely with science as the driver, explained Laurence O’Rourke and Michael Küppers at the Rosetta Science Operations Center near Madrid, Spain.

“The desire is to place the spacecraft as close as feasible to the comet before the activity becomes too high to maintain closed orbits,” says Laurence.

“This 20 km orbit will be used by the science teams to map large parts of the nucleus at high resolution and to collect gas, dust and plasma at increasing activity.”

Planning the science orbits involves two different trajectories: ‘preferred’ and ‘high-activity’. While the intention is always to fly the preferred path, Rosetta will move to the high-activity trajectory in the event the comet becomes too active as it heats up.

“This will allow science operations to continue besides the initial impact on science planning that such a move would entail,” adds Michael.

Science Takes a Front Seat
“Science will now take front seat in this great mission. It’s why we are there in the first place!” says Matt Taylor, Rosetta Project Scientist.

“The science teams have been working intensively over the last number of years with the science operations center to prepare the dual planning for this phase.”

When solar heat activates the frozen gases on and below the surface, outflowing gas and dust particles will create an atmosphere around the nucleus, known as the coma.

Rosetta will become the first spacecraft to witness at close quarters the development of a comet’s coma and the subsequent tail streaming for millions of kilometers into space. Rosetta will then have to stay further from the comet to avoid the coma affecting its orbit.

In addition, as the comet nears the Sun, illumination on its surface is expected to increase. This may provide sufficient sunlight for the DLR-operated Philae lander, now in hibernation, to reactivate, although this is far from certain.

Early next year, Rosetta will be switched into a mode that allows it to listen periodically for beacon signals from the surface.

Where is Rosetta?
ESA’s animated map is a great way to track the spacecraft.

More about Rosetta
Rosetta is an ESA mission with contributions from its Member States and NASA. Rosetta’s Philae lander is provided by a consortium led by DLR, MPS, CNES and ASI.

Regular updates on Rosetta’s continuing mission and its scientific explorations will be posted in the mission blog.

Posted by: Soderman/SSERVI Staff
Source: ESA

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