NASA’s Psyche spacecraft successfully completed a gravity-assist flyby of Mars on May 15, 2026, capturing rare images and testing scientific instruments while gaining speed toward its 2029 destination. The mission, currently en route to a metal-rich asteroid, used the planet’s gravity to adjust its trajectory and save fuel.
Mars Flyby Maneuver and Gravity Assist
The Psyche spacecraft, which launched in October 2023, is currently on a 2.2 billion-mile journey to study a metallic asteroid located between Mars and Jupiter. To reach its target by 2029, the probe performed a critical gravity-assist maneuver at Mars on May 15, 2026. According to Usatoday, this slingshot-like maneuver allowed the spacecraft to harness Mars’ gravitational pull to increase its speed and adjust its trajectory without consuming significant amounts of propellant.
At the time of the encounter, the spacecraft was traveling at approximately 12,333 mph. While the primary goal was navigation, the mission team at NASA’s Jet Propulsion Laboratory utilized the opportunity to conduct a full-scale rehearsal for the science operations planned for the asteroid Psyche. The probe maintained a safe distance, coming no closer than 2,864 miles (4,609 kilometers) from the Martian surface, as reported by NASA.
Instrument Calibration and Scientific Findings
The flyby provided a unique environment to test the suite of instruments that will eventually study the asteroid’s composition and magnetic history. Scientists used the event to calibrate equipment under dynamic, real-world conditions. The mission’s imager, magnetometer, and gamma-ray and neutron spectrometer teams worked overtime to make full use of this planetary encounter, and all instruments delivered great results,
said Lindy Elkins-Tanton, principal investigator for Psyche at the University of California, Berkeley, via NASA.
The spectrometer, managed by the Johns Hopkins Applied Physics Laboratory, successfully detected neutrons escaping from the Martian surface. Around the time of Mars closest approach, the neutron spectrometer detected a count-rate enhancement close to what we anticipated. It was very gratifying to see,
noted David Lawrence, the science lead for Psyche’s spectrometer. While the distance prevented the detection of gamma rays, the team confirmed the instrument performed as designed.
Additionally, the magnetometer recorded its first magnetic field signature from a celestial body. Ben Weiss, deputy principal investigator and the magnetometry investigation lead at the Massachusetts Institute of Technology, explained that the instrument detected a sharp increase in magnetic activity as the probe crossed the Martian bow shock—the turbulent region where the solar wind meets the planet’s magnetic environment. This flyby calibration effort validated the instrument’s performance under dynamic conditions while also revealing the fascinating physics of planetary magnetism,
Weiss stated.
Rare Perspectives of the Martian Surface
The spacecraft’s multispectral imager captured a sequence of images that NASA has since compiled into a time-lapse video. As ZME Science reported, the approach offered an unusual perspective: the planet initially appeared as a thin, bright crescent before expanding into a globe showing geological details like the Valles Marineris canyon system and the southern ice cap.
The imagery also revealed impact basins and wind-swept dust patterns on the Martian plains. Jim Bell, the Psyche imager instrument lead at Arizona State University, noted the quality of the data, stating, The imager performed brilliantly, delivering some rarely seen views of the Red Planet.
These images, along with data regarding the planet’s moons, Phobos and Deimos, will be compared against existing records from other orbiters and rovers to refine the spacecraft’s camera calibration.
Mission Outlook and Future Trajectory
With the Mars flyby successfully behind it, the Psyche spacecraft continues its cruise toward the main asteroid belt. The data collected during the encounter serves as a proof-of-concept for the upcoming study of the metallic asteroid Psyche, which scientists hope to study in order to glean valuable insights about Earth’s own core. By confirming that the instruments can detect surface elements and magnetic signatures from a planetary body, the team has increased confidence in the probe’s readiness for its 2029 arrival.
While the flyby was a technical success, the mission remains a long-term endeavor. The spacecraft is currently on a multi-year path to reach its target, with mission controllers continuing to monitor the vehicle’s health as it travels deeper into the solar system. The primary question remaining for the team is how the instruments—now proven at Mars—will function when they finally encounter the unique, metal-rich environment of the asteroid itself, an object far different from the rocky, atmospheric world of Mars.
Related reading
