NASA's Nancy Grace Roman Space Telescope has cleared two major milestones less than a month after launch, and mission planners now say the observatory could operate for more than two decades — far longer than originally planned.
The spacecraft, launched on August 30, is en route to the L2 Lagrange point nearly one million miles from Earth. Its 300-megapixel infrared camera, the Wide Field Instrument, was powered up on September 11, and the coronagraph designed to directly image exoplanets came online on September 1, just two days after launch.
NASA reports that onboard fuel could support at least 22 years of science operations, more than double the initial estimate of roughly a decade. The original plan called for a five-year primary mission with a possible five-year extension contingent on fuel usage.
«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,» said Jamie Dunn, director of NASA's Goddard Space Flight Center.
The fuel savings stem from several factors. Before launch, the spacecraft came in under weight, allowing NASA to load additional fuel into its tanks. A mid-course correction burn executed the day after launch was hit with 99% accuracy, using only a tenth of the hydrazine budgeted for the maneuver and saving nearly 400 pounds of fuel. If the next course correction goes equally well, even more fuel could be preserved.
Fuel efficiency is critical because Roman's destination at L2 is so distant that a crewed rescue mission is out of the question with current technology. Every burn must be carefully managed.
The Wide Field Instrument, about the size of a laptop, has a field of view roughly 100 times larger than Hubble's. It contains 18 infrared detectors designed to sharply capture large patches of deep space. Baseline images were taken to confirm the instrument is working as designed.
The coronagraph, described by the mission team as a system of masks, prisms, detectors, and self-flexing mirrors, blocks the glare of distant stars to directly image planets and disks in orbit around them. It now requires 30 days to warm up and decontaminate as trace water and chemicals boil off its surface.
Before full science operations can begin, both instruments will undergo months of calibration and comprehensive testing. The next mid-course correction is scheduled for later this month, with orbital insertion at L2 expected in early December, about 100 days after launch. The first images from Roman are anticipated in early 2027.
Roman's primary mission is to study dark energy and search for new exoplanets across billions of nearby galaxies. The unexpectedly long fuel life could allow the telescope to continue those investigations for far longer than the mission's original design lifetime.
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