Venus probe and solar sail join H-2A rocket for launch
BY STEPHEN CLARK
Posted: May 10, 2010
An interplanetary weather satellite bound for Venus and a device to test new propulsion techniques were trucked across Japan's island space center Sunday to meet the H-2A rocket that will launch the payloads into space next week.
Once inside the VAB, the nearly 40-foot-tall fairing was lifted atop the H-2A rocket and firmly bolted to the booster.
After engineers complete testing of the rocket, the 17-story vehicle will roll on rail tracks about 1,500 feet to the launch pad next Monday. Once the rocket arrives at the launch pad, workers will load liquid hydrogen and liquid oxygen propellant into the H-2A's first and second stages.
Flying for the 17th time, the H-2A rocket on this mission carries a pair of powerful solid rocket boosters and no smaller strap-on motors. This configuration is called the "202" version.
The launch will occur at 6:44 a.m. local time at Tanegashima, a narrow strip of land off the coast of Japan's Kyushu Island, the southernmost of the country's four largest land masses.
About the size of a small car, the Akatsuki spacecraft arrived at the launch site March 19 to begin final testing and fueling operations. The Ikaros solar sail, a secondary payload, was shipped to Tanegashima in early April.
The 1,100-pound Venus probe was attached to an apparatus containing Ikaros and other small satellites April 30. The payloads were encapsulated inside the fairing May 4.
The probe will enter an equatorial orbit around Venus stretching from just above the planet's blanketing atmosphere to an altitude of nearly 50,000 miles. It will be ideally placed to observe the whipping winds that drive massive storm systems in the Venusian atmosphere.
Ikaros will be released on the same course as Akatsuki, but its mission will be to demonstrate applying light pressure from the sun as a source of interplanetary propulsion. Although never before tested in deep space, solar sails could provide efficient propulsion for future missions traveling between planets and stars.