Japan’s Akatsuki spacecraft has arrived in orbit around Venus, five years after an engine failure scuttled its first attempt, Japanese Aerospace Exploration Agency (JAXA) officials announced in December 9. The $300 million Akatsuki mission launched in May 2010 along with JAXA’s IKAROS (Interplanetary Kite-craft Accelerated by Radiation Of the Sun) spacecraft, which became the first probe ever to deploy and use a solar sail in interplanetary space.
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On Sunday (Dec. 6), Akatsuki fired its small attittude-control thrusters for 20 minutes to achieve Venus orbit (its main engine was pronounced dead long ago). After a few days of calculations and computations, mission controllers have now determined that the maneuver worked.

“The orbit period is 13 days and 14 hours. We also found that the orbiter is flying in the same direction as that of Venus’s rotation,” JAXA officials wrote in a statement today. “The Akatsuki is in good health.”

Akatsuki’s current path takes it as close as 250 miles (400 kilometers) to Venus, and as far away as 273,000 miles (440,000 km), officials added. This orbit is much more elliptical than the one Akatsuki was supposed to achieve five years ago, which featured a period of 30 hours and an apoapsis (most distant point from Venus) of 50,000 miles (80,000 km) or so.

Akatsuki’s handlers will soon deploy and test three of the probe’s six instruments, to make sure they’re working properly — the other three are already known to be in good condition — and then conduct initial observations with all of this scientific gear for about three months, JAXA officials said.

At the same time, Akatsuki will maneuver to a less-elliptical final science orbit with a period of about nine days and an apoapsis around 193,000 miles (310,000 km). The probe should achieve that orbit, and commence regular operations, by April 2016.

Despite the long delay, the drama and the highly elliptical orbit, Akatsuki should still be able to accomplish most of its science goals, JAXA officials have said.

Akatsuki is the second interplanetary mission in Japan’s history. The country’s first, the Nozomi Mars probe, failed to arrive as planned at the Red Planet in 2003. In 2007, Japan’s Kaguya orbiter successfully launched to the moon to study the lunar surface from orbit. Kaguya’s mission ended in 2009 and it ultimately crashed into the moon’s surface.

by Mike Wall, Space.com