NASA's Nancy Grace Roman Space Telescope is gliding toward its distant observation post on a trajectory so precise that engineers now estimate the spacecraft has enough fuel for 22 years of science operations — more than double the 10-year baseline mission the agency planned.
The $4.3 billion observatory launched August 30 aboard a SpaceX Falcon Heavy rocket from Kennedy Space Center, Florida. Roman's designers originally loaded fuel for a minimum five-year mission with a possible five-year extension. The spacecraft arrived so light — about two tons under its maximum allowable weight — that ground crews could fill all four fuel tanks to capacity rather than partial fill.
The day after launch, the first course correction burn consumed just 40 pounds of hydrazine, versus the 441 pounds preflight planners had budgeted. "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, center director at NASA's Goddard Space Flight Center.
Roman's Wide Field Instrument — equipped with 18 near-infrared detectors producing images equivalent to a 300-megapixel camera — will provide the same resolution as Hubble but with 100 times the field of view. The observatory will map galactic clusters, filaments of matter and dark matter, and help researchers study the nature of dark energy, the force driving the accelerating expansion of the universe.
The telescope opened its aperture cover on September 1, and all 18 detectors are performing well during preliminary checkouts. A coronagraph instrument for direct imaging of exoplanets has also passed initial tests.
Roman's lower fuel burn also lowers the urgency of any future servicing mission. The observatory was designed with a grapple fixture and magnetic-closure fueling port for potential robotic refueling, though no servicing spacecraft capable of reaching Roman's L2 orbit — roughly a million miles from Earth — currently exists.
A second course correction planned for later this month and a final orbit-insertion maneuver in early December are both expected to consume less fuel than budgeted, potentially extending the mission even further.
Roman launched nine months ahead of its original schedule and will arrive at L2 within about three months, where it will begin what promises to be a decades-long survey of the cosmos.
