NASA’s Nancy Grace Roman Space Telescope is producing sharper images than scientists expected. After a series of tests and small adjustments, its main camera system, called the Wide Field Instrument, achieved image quality nearly 30% better than predicted. Roman launched on August 30.
Engineers checked the camera’s 18 detectors, which receive incoming light, along with its electronics and temperature controls. They also used adjustable lights inside the instrument to check how the detectors responded. The telescope’s mirrors were already positioned very accurately, so only tiny changes were necessary. One mirror moved by about one-sixteenth of the width of a human hair.
Roman’s second scientific instrument, the coronagraph, now meets the team’s expectations after its focus was corrected. Engineers will continue adjusting its settings and plan to test how well it blocks unwanted light. This ability is important for observing faint objects near brighter ones. Roman’s sharper images should support its surveys of large areas of space, helping scientists investigate mysteries such as dark matter and dark energy.
