Posted: Tue, Feb 24, 2004, 8:49 PM ET (0149 GMT)
Rosetta, ESA's ambitious mission to rendezvous with and land on a comet, is on track for a launch early Thursday. Rosetta is scheduled for launch at 2:36 am EST (0736 GMT) on an Ariane 5 booster from Kourou, French Guiana. The spacecraft, composed of an orbiter and a lander named Philae, will spend ten years traveling through the solar system, adjusting its trajectory through a series of flybys — three of Earth and one of Mars — before reaching the comet Churyumov-Gerasimenko. Rosetta will then spend more than a year studying the comet and deploying Philae to land on the surface of the comet's nucleus. Rosetta was scheduled to launch in January 2003 on a mission to another comet, Wirtanen, but the launch was delayed to allow time to investigate an Ariane 5 launch failure in December 2002. The delay meant the spacecraft missed its narrow launch window, requiring ESA to redesign the mission to visit another comet.
