Faulty Valve Caused Akatsuki Failure at Venus

By Nancy Atkinson - December 28, 2010 at 11:13 AM UTC | Planetary Science
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The Japanese space agency has deduced that a faulty engine valve was the reason the Akatsuki spacecraft did not go into orbit around Venus as planned on December 6, 2010. According to the Daily Yomiuri, a malfunctioning valve in the probe's fuel pressure system caused the engine to function abnormally. The valve is a standard component in many previous space missions, JAXA said, and it was not modified at all for Akatsuki.

Earlier, JAXA reported that Akatsuki's engine did perform a burn

to slow it down, but 152 seconds into the burn the fuel pressure dropped and the probe became unbalanced. Because the retrofiring of the rockets failed to slow down the probe enough for Venus to capture it, it was unable to enter into orbit around the planet, and then went into safe mode.

The JAXA investigation identified five possible causes of the mishap and all stemmed from the valve's failure to open. JAXA also said they intend "to further investigate why the valve did not open, and how much damage was caused to Akatsuki's thruster nozzle, by conducting tests that also will indicate whether the probe will be able to go into orbit around Venus when it comes near the planet six years from now."

After Akatsuki's launch in May, the functions of its main engine were tested in June. However, the engine was fired for too short a time to detect the problem with the valve, JAXA said.

The findings were presented to the Education, Culture, Sports, Science and Technology Ministry's Space Activities Commission.

Source: Daily Yomiuri

Nancy Atkinson

Nancy Atkinson

Nancy Atkinson is a space journalist and author with a passion for telling the stories of people involved in space exploration and astronomy. She is currently retired from daily writing, but worked at Universe Today for 20 years as a writer and editor. She also contributed articles to The Planetary Society, Ad Astra (National Space Society), New Scientist and many other online outlets.

Her 2019 book, "Eight Years to the Moon: The History of the Apollo Missions,” shares the untold stories of engineers and scientists who worked behind the scenes to make the Apollo program so successful, despite the daunting odds against it. Her first book “Incredible Stories From Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos” (2016) tells the stories of 37 scientists and engineers that work on several current NASA robotic missions to explore the solar system and beyond.

Nancy is also a NASA/JPL Solar System Ambassador, and through this program, she has the opportunity to share her passion of space and astronomy with children and adults through presentations and programs. Nancy's personal website is nancyatkinson.com