Venus as captured by the Akatsuki spacecraft's Ultraviolet Imager instrument on Dec. 6, 2015, from a distance of about 44,700 miles (72,000 kilometers).

A Japanese Venus probe took advantage of its long-awaited second chance.

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 today (Dec. 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. [See photos of Venus and IKAROS from Japan's Akatsuki]

Venus as seen by the Akatsuki probe's 1-Micron Camera on Dec. 6, 2015, from a distance of 42,250 miles (68,000 km). (Image credit: JAXA)

Akatsuki was originally supposed to enter Venus orbit on Dec. 6, 2010, then study the planet's clouds, weather and atmosphere from above for at least two years to learn more about how the world became so hot and seemingly inhospitable to life. But the spacecraft's main engine conked out during a crucial orbit-insertion burn, and Akatsuki went zooming off into space.

The spacecraft — whose name means "Dawn" in Japanese — had been circling the sun for five years, waiting for another shot at Venus. That shot came exactly five years to the day after the first opportunity.

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.

Diagram showing the orbit of Japan's Akatsuki spacecraft, which arrived at Venus on Dec. 6, 2015. (Image credit: JAXA)

"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.

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