Paris, October 21 Reports indicate that the European Sapce Agency's (ESA's) Rosetta comet chaser will swing by Earth on November 13 to pick up orbital energy and begin the final leg of its 10-year journey to the outer Solar System.

Several observations of the Earth-Moon system are planned before the spacecraft heads out to study comet 67/P Churyumov-Gerasimenko. This will be the third Earth swingby, the last of Rosetta's four planetary gravity assists.

The swingby will provide exactly the boost Rosetta needs to continue into the outer Solar System. The craft is scheduled for a close encounter with asteroid 21 Lutetia in July next year. Rosetta is expected to arrive at its final destination in May 2014. There, it will release the Philae lander for in-situ studies on the surface.

The spacecraft will then escort the comet on its journey toward the Sun, studying it closely for up to two years.

As it closes in on Earth next month, Rosetta will have travelled almost 4500 million km since launch.

It will speed past Earth at 13.3 km/s, passing above the Indian Ocean at 109 degrees east, 8 degrees south, just south of the Indonesian island of Java.

The gravity-assist will increase the spacecraft's speed by 3.6 km/s with respect to the Sun. hile the swingby is critical for achieving the velocity required to reach its ultimate destination, the close encounter will also be used to study the Earth-Moon system from Rosetta's unique perspective.

Several instruments that usually hibernate during the long trek will be turned on in the week before the swingby.

Closest approach is scheduled for 08:45 CET on November 13, but mission operators will perform a number of critical actions before and after the swingby to ensure that Rosetta is on the right trajectory. (ANI)