NASA's Psyche spacecraft returns unfamiliar views of a familiar world

At a glance:

• NASA's Psyche spacecraft captured Mars from a high phase angle, revealing the planet as a thin crescent with its wispy atmosphere prominently displayed.
• Thousands of images taken during the May 15, 2026 flyby will calibrate the mission's cameras and instruments, ensuring optimal performance.
• This flyby serves as a critical rehearsal for the spacecraft's main event: the 2029 encounter with the metallic asteroid Psyche.

The Mars Flyby

NASA's Psyche spacecraft, en route to the asteroid belt, executed a gravity assist flyby of Mars on May 15, 2026. Approaching from a high phase angle—opposite the Sun—the spacecraft captured images of Mars as a delicate crescent, with sunlight illuminating the thin, diffuse clouds of dust suspended in the Martian atmosphere.

The view extended from the south polar cap northwards to the Valles Marineris canyon system, offering a perspective impossible to achieve from Earth. NASA highlighted the rarity of this viewpoint, noting that such high-phase-angle images provide unique insights into planetary atmospheres.

Instrument Performance and Calibration

Jim Bell, who leads the Psyche imager instrument team at Arizona State University, emphasized the importance of the flyby for instrument health. "The spacecraft took thousands of images during the encounter," Bell said, adding that these observations will help scientists "calibrate and characterize" the performance of the cameras.

Beyond the imagers, Psyche's magnetometer may have detected signatures of the solar wind interacting with Mars' upper atmosphere or its remnant magnetic field. The spectrometers were also active, measuring the chemical composition of the Martian surface beneath the spacecraft's flight path.

Scientific Context and Future Prospects

While numerous missions are continuously exploring Mars, making major discoveries from the Psyche flyby unlikely, the calibration opportunity is invaluable. The data allows researchers to validate instrument models against well-studied Martian phenomena, reducing uncertainties for the asteroid encounter.

This approach leverages existing knowledge to enhance the Psyche mission's scientific return. The real payoff of the Psyche mission awaits in 2029, when the probe will arrive at its namesake asteroid—a Massachusetts-sized object believed to be rich in iron, nickel, and other metals.

Conclusion

The Mars flyby not only provided stunning new views of a familiar world but also served as a practical test for the Psyche spacecraft's systems. Gaining such perspectives underscores the value of space exploration, even when revisiting known destinations.

As the spacecraft journeys onward to asteroid Psyche, the lessons learned from Mars will pave the way for groundbreaking discoveries in uncharted territory. The mission exemplifies how interim milestones contribute to long-term scientific goals.