Roman Space Telescope passes checkout and enters its final commissioning phase

NASA's Nancy Grace Roman Space Telescope has cleared its health checks and moved into science commissioning, the last stage before regular observations begin. On October 22, 2026, senior project scientist Julie McEnery said the team has "established that the observatory is fully functional." Roman can point and guide, take exposures, send data home, and slew between targets.

Roman launched on a SpaceX Falcon Heavy on August 30, 2026, and switched on its main camera, the Wide Field Instrument, in September.

Sharper than expected

Through early October, engineers tested the camera's 18 detectors, its wheel of filters, its built-in calibration lights, and its thermal system. Then they fine-tuned the telescope's focus. The adjustment was tiny: the secondary mirror moved by about one-sixteenth the width of a human hair.

The result beat expectations. The requirement for image quality was an optical error of about 90 nanometers; the measured value is 63 nanometers, close to 30% better than predicted. Optical engineer Alden Jurling said Roman's survey images "will be even sharper than we expected."

Roman's second instrument, a coronagraph that blocks starlight to reveal faint planets next to bright stars, needed a small focus correction that was easier than the team feared. It now performs as expected, and the team plans to test its light-blocking ability in the coming weeks.

The team had also worried that crowded star fields or dusty nebulae might confuse Roman's guidance system. Test pointings at those kinds of regions went well.

Why it matters

Roman's strength is speed and width: it can image huge patches of sky quickly while still detecting objects about 100 million times fainter than the human eye can see. That makes it ideal for mapping dark matter and dark energy across billions of galaxies, and for finding exoplanets by the way their gravity briefly brightens background stars. Where Webb looks deeply at small spots, Roman will make big sky maps routine.

What comes next: the team is now calibrating the instruments and polishing image quality. NASA has not given a start date, but says science operations begin once commissioning is complete.