NASA said on September 14 that its Nancy Grace Roman Space Telescope has enough propellant for at least 22 years of potential science operations, more than twice the 10 years for which the mission was originally designed.
The estimate follows a highly efficient first mid-course correction manoeuvre, a launch mass below the spacecraft's maximum design allowance and expected savings during further manoeuvres. NASA says each of those factors could add roughly four years to Roman's operating life.
Roman lifted off in August 2026 aboard a SpaceX Falcon Heavy from Kennedy Space Center and is travelling towards the Sun-Earth L2 Lagrange point, approximately 1 million miles from Earth. The telescope's original fuel allocation covered a five year primary mission and five years of extended operations.
The operations team fired Roman's thrusters on August 31, the day after liftoff. The first course correction used 40 pounds (18 kilograms) of propellant, or nine percent of the 441-pound (200-kilogram) fuel budget assigned to that manoeuvre. NASA said the burn achieved better than 99 percent accuracy.
That performance alone is expected to provide roughly four additional years of science operations beyond Roman's design life. Jamie Dunn, centre director at NASA's Goddard Space Flight Center in Greenbelt, Maryland, said: “As a result of exquisite planning by our orbital dynamics team, brilliant execution by the operations team, and a precise launch from SpaceX, Roman has fuel for at least 22 years of potential science operations”.
NASA also pointed to the spacecraft's mass at launch. Roman weighed 8,056 kilograms, while the team had planned its fuel budget around a maximum mass of 9,800 kilograms. The lower mass is expected to add another four years of operations.
Strategic over-filling at launch is projected to provide a further roughly four years of potential science work. NASA expects the second mid-course correction and the manoeuvre to insert Roman into its final L2 orbit to use less propellant than planned. Those projected savings account for another roughly four years in the agency's estimate.
The second mid-course correction is planned for later in September 2026. Roman's insertion into its final L2 orbit is currently projected for early December, about 100 days after launch. NASA has not given an exact date for that insertion, and the propellant use of either remaining manoeuvre is not yet known.
Once Roman reaches its orbit, it will need a brief engine burn every 28 days to hold its position. The telescope is intended to survey billions of galaxies and search for exoplanets with its wide-field infrared instrument.
The 22-year figure remains an estimate based on the mission's progress so far. It will depend on the performance of the second correction burn, the L2 insertion manoeuvre and the propellant required for operations after Roman arrives in orbit.
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