Rosetta spacecraft Last visit home for ESA’s comet chaser
ESA's Rosetta comet chaser will swing by Earth on 13 November 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. Closest approach to Earth is expected at 08:45 CET. 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°E, 8°S, 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.
Rosetta spacecraft Instruments in action
While 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.
Follow the swingby live
The Rosetta Blog will be updated regularly for this final planetary swingby. Follow crucial events live via the blog and the dedicated ESA Rosetta mission website.
Critical swingby events
Closest approach is scheduled for 08:45 CET on 13 November, but mission operators will perform a number of critical actions before and after the swingby to ensure that Rosetta is on the right trajectory.
One of the most important will be a trajectory correction manoeuvre (TCM), scheduled for 22 October at 14:30 CET. Results of this manoeuvre will be analysed to determine whether additional TCMs are required to achieve the correct approach trajectory.
Notes: All times are in Central European Time (CET/CEST) TCM: Trajectory correction manoeuvre DSN: Deep Space Network (NASA) DSA: Deep Space Antenna (ESA)
Time Event 22 October 14:30 – 21:30 TCM slot 5 November 12:30 – 19:30 Slot for TCM if needed 6 November Beginning 22:45 Instruments switched on to begin observations of the Earth-Moon system 12 November 10:30 – 17:30 Slot for TCM if needed 13 November 01:00 – 08:00 Slot for TCM if needed 08:45 Earth closest approach 09:04 - 10:55 Swing by confirmation via Maspalomas ground station, Canary Islands 11:00 – 21:00 Start science data download via NASA DSN Goldstone, California 16:41 Moon closest approach 21:13 - 5:04 (14 November) ESTRACK DSA New Norcia ground station pass, Australia 19 November By 12:05 Instruments turned off
All times are subject to change.
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La sonde Rosetta en orbite terrestre.
Cette animation montre le principe de l'assistance gravitationnelle. La courbe rouge représente l'évolution de la vitesse de la sonde dans le temps.

La sonde de l'agence spatiale européenne Rosetta, lancée en mars 2004, effectuera son dernier survol de la Terre (''earth swing-by'', abrégé ESB) le vendredi 13 novembre à 07 h 45 UTC, a annoncé l'ESA.

Ce dernier passage doit lui permettre d'acquérir de la vitesse, selon la méthode de l'assistance gravitationnelle, avant de partir dans l'espace lointain vers la comète 67P/Churyumov-Gerasimenko, qu'elle devrait atteindre en 2014.

Par le passé, deux autres survols ont étés effectués : un en mai 2005 puis un le 13 novembre 2007.

Rosetta a été baptisée d'après la fameuse pierre de Rosette, qui permit il y a près de 200 ans de déchiffrer les hiéroglyphes égyptiens. En 2008, la sonde a survolé l'astéroïde (2867) Šteins et devrait survoler en 2010 (21) Lutèce. L'objectif principal de la mission, dont la fin est prévue pour décembre 2015, est l'étude de la comète 67P/Churyumov-Gerasimenko, sur laquelle la sonde déposera l'atterisseur Philae.