After a successful liftoff, the US space shuttle Discovery headed for the International Space Station (ISS) early yesterday, carrying a final pair of solar panels due to be installed ahead of the arrival of an expanded space crew. The spacecraft launched from the Kennedy Space Center in Florida at 7:43pm on Sunday and reached orbit a little more than eight minutes later. The journey to the station was expected to take two days.
Mike Leinbach, launch director for the mission, said the liftoff was picture perfect.
“I have seen a lot of launches ... and this was the most visually beautiful,” he told reporters in a briefing. “It was just spectacular. When the orbiter and the tank, booster got up in the sunlight ... It was just gorgeous.”
The mission, one of the last major tasks of the more than decade-long effort to construct the station, has been shortened by a day after a hydrogen leak last week led to a scrub of an earlier launch date.
But National Aeronautics and Space Administration (NASA) officials said that the problem had been cleared up and that there had been no recurrence of the malfunction.
The leak was discovered on Wednesday, when the external tank was 98 percent full of liquid hydrogen, prompting it to be emptied for the checks. In all, the shuttle mission was delayed five times since last month.
Once the Discovery mission installs the solar truss — the last major segment to be attached to the ISS which itself was begun in 1998 — the space station will become fully operational and capable of housing six astronauts, NASA said.
The mission also will allow space officials to make a swap of personnel, exchanging Japanese astronaut Koichi Wakata for US astronaut Sandra Magnus, who will be returning to Earth after four months in space.
Wakata, of the Japan Aerospace Exploration Agency, who is traveling aboard Discovery, will become the first Japanese crew member on the station.
Last week’s scrubbed launch forced space officials to shorten what had been planned as a 14-day mission to 13 days and to scrap one of four planned spacewalks.
However, officials said the scheduling adjustments should not affect the mission to deliver and install a fourth pair of solar panels to the ISS.
Installing the solar panels on the US$100 billion station was to take a two-astronaut team four space walks of more than six hours each to complete, NASA’s original plans showed.
The pairs of solar panels, containing 32,800 solar cells, are each 35m long. The final array, once in place, should boost available energy to the ISS to 120 kilowatts — equivalent to that used in about 50 houses — from the current 90.
The extra power will help run an expanded array of scientific experiments to be conducted in the ISS, which saw the addition over the past year of NASA workspace and a pair of international laboratories — Europe’s Columbus and Japan’s Kibo.
The main purpose of the space station is to provide an environment that is zero-gravity for scientific experiments.
However, at present, there is insufficient staff to simultaneously conduct research and maintain the space station.
Additional energy from the soon-to-be-installed solar panels will supply power for onboard laboratories and for the station’s crew, which will double from three to six in May.
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