NASA's Nancy Grace Roman Space Telescope, launched Aug. 30 from Cape Canaveral, may now have enough propellant for at least 22 years of science operations — more than double the observatory's original 10-year design life, mission managers said this month.
The extra runway comes from two sources. First, Roman's initial mid-course correction on Aug. 31 nailed its trajectory with better than 99 percent accuracy while burning only about 18 kilograms of fuel, a fraction of the 200 kilograms budgeted for the maneuver. Second, the spacecraft weighed in at 8,056 kilograms at liftoff, well under the 9,800-kilogram ceiling engineers had planned for, which let technicians top off the propellant tanks beyond what a standard 10-year mission required. Together, NASA says the savings could push Roman's potential total mission life to 22 years or more, according to a NASA Goddard blog post.
A Wide-Field Successor to Hubble
Roman carries a mirror the same size as Hubble's but pairs it with a much wider field of view, letting it survey large swaths of sky to study dark energy's effect on the universe's expansion, catalog thousands of exoplanets through gravitational microlensing, and image faint, distant galaxies. The telescope launched roughly nine months ahead of its original schedule and is now headed toward the Earth-sun L2 point, where it is expected to settle into orbit about 100 days after launch, followed by routine station-keeping burns roughly every 28 days.
Jamie Dunn, center director at NASA's Goddard Space Flight Center, said the mission's precise execution so far is what unlocked the extra fuel margin.
Roman has fuel for at least 22 years of potential science operations.
Jamie Dunn, Center Director, NASA Goddard Space Flight Center
A second mid-course correction is planned later this month, with NASA expecting further, though smaller, fuel savings once the spacecraft settles into its final orbit, according to a report from ScienceDaily. Officials caution that a mission's potential lifetime is not a guarantee — instrument health, future budget decisions and unforeseen anomalies could still shorten Roman's run — but for a telescope designed to operate for a decade, the current fuel reserve gives NASA far more flexibility than most flagship missions have had this early in their lives.
