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All hail the Ariane 5 rocket, which doubled the Webb telescope?s lifetime


the James Webb Space Telescope
NASA
Mission Systems
the European Space Agency
The Interplanetary Podcast
Vulcain
it."A
Ars Orbital Transmission
CNMN Collection WIRED Media Group
Condé Nast


Eric Berger
Webb
Mike Menzel
Rudiger Albat
Ariane
Ars


European


Earth
Europe

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Lagrange
Ariane

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Positivity     34.00%   
   Negativity   66.00%
The New York Times
SOURCE: https://arstechnica.com/science/2022/01/all-hail-the-ariane-5-rocket-which-doubled-the-webb-telescopes-lifetime/
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Summary

NASA's Mission Systems Engineer for the Webb telescope, Mike Menzel, said the agency had completed its analysis of how much "extra" fuel remained on board the telescope. Roughly speaking, Menzel said, Webb has enough propellant on board for 20 years of life.This is twice the conservative pre-launch estimate for Webb's lifetime of a decade, and it largely comes down to the performance of the European Ariane 5 rocket that launched Webb on a precise trajectory on Christmas Day.Prior to launch, the telescope was fueled with 240 liters of hydrazine fuel and dinitrogen tetroxide oxidizer. NASA and the European Space Agency reached an agreement more than a decade ago by which Europe would use its reliable Ariane 5 rocket to lift the telescope into space, and in exchange, European scientists would get time to use the telescope.During an interview with The Interplanetary Podcast, Ariane 5 program manager Rudiger Albat explained how European rocket scientists approached the Webb launch.

As said here by Eric Berger