NASA’s Psyche spacecraft executed a planned gravitational assist maneuver at Mars on May 15, successfully adjusting its course toward its ultimate destination: the metal-rich asteroid Psyche in the main asteroid belt. The encounter provided mission scientists with an invaluable opportunity to evaluate the spacecraft’s instruments against a well-studied planetary body before the probe reaches its target in 2029.
During the close approach, which occurred at an altitude of 2,864 miles, the spacecraft’s suite of scientific instruments performed successfully across multiple tests. The gamma-ray and neutron spectrometer, designed to identify chemical elements on asteroid Psyche’s surface, detected an anticipated count-rate enhancement of neutrons from Mars. Though the spacecraft’s distance prevented detection of gamma rays, the instrument demonstrated it could function as intended. The spectrometer works by measuring neutrons and gamma rays released when cosmic rays interact with surface elements, allowing researchers to determine an object’s composition.
The magnetometer, which has been operational since the spacecraft’s launch in 2023, registered significant readings as it passed through Mars’ magnetic bow shock region—the area where the solar wind collides with the planet’s magnetic field. This marked the first time the instrument measured a celestial body’s magnetic signature during its cruise phase. The multispectral imager captured detailed photographs of Mars throughout the month-long encounter, including views of surface features such as craters and the south polar ice cap, as well as distant detections of the Martian moons Phobos and Deimos.
Researchers are comparing the imagery and data from the Psyche flyby with observations from multiple other Mars missions, including NASA’s Mars Reconnaissance Orbiter and Curiosity rover, as well as spacecraft from the European Space Agency and United Arab Emirates. These comparative analyses will help calibrate the instruments before they begin investigating the largely unknown asteroid. Following the successful gravity assist, Psyche is now on its correct trajectory toward the asteroid, with plans to resume solar-electric propulsion thrusting in the fall.
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