The Valve That Lost Fuel and Cost Nozomi Its Mars Window
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The Valve That Lost Fuel and Cost Nozomi Its Mars Window
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The Valve That Lost Fuel and Cost Nozomi Its Mars Window
In this episode, we follow the sequence that turned a precise Mars transfer into a multi‑year odyssey. The story covers the launch, the Earth flybys, the valve failure during the bipropellant burn, and the long rescue plan that hinged on gravity assists and surviving deep space - can calculated patience recover what one valve took?
Person: Nozomi
Date: Launch July 4, 1998; planned Mars arrival October 11, 1999
Location: Earth flybys and heliocentric drift en route to Mars
Event: Valve malfunction during Earth flyby bipropellant burn causing uncontrolled fuel loss
Status: Mission trajectory revised to use additional Earth gravity assists and a multi‑year drift
- Launched July 4, 1998, Nozomi carried 540 kg total mass including 282 kg of propellant dedicated to precise burns.
- The mission used two lunar swingbys and an Earth atmosphere skim to build velocity with minimal fuel expenditure.
- During the December 20, 1998 Earth flyby burn a valve in the bipropellant system failed, allowing uncontrolled fuel loss mid‑burn.
- Controllers attempted correction burns on December 21 that consumed additional propellant and left the spacecraft underfueled for the original October 1999 arrival.
- Engineers replanned a rescue using a four‑year heliocentric drift and two more Earth flybys in 2002 and 2003 to rebuild velocity by gravity assists.
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