NASA’s Psyche spacecraft executed a successful gravitational assist maneuver at Mars, achieving dual objectives of trajectory correction and instrument validation. The May 15 encounter provided the spacecraft with the necessary speed increase and course adjustment to reach its target asteroid in the main asteroid belt between Mars and Jupiter in 2029.
The flyby presented a valuable opportunity for mission teams to evaluate the spacecraft’s scientific instruments using a well-characterized planetary body before they are deployed at the asteroid. The mission’s imager, magnetometer, and gamma-ray and neutron spectrometer all performed as anticipated during the encounter. According to Lindy Elkins-Tanton, principal investigator for the mission, the data collected complemented existing Mars science through the spacecraft’s unique vantage point, though no unexpected discoveries were anticipated given the extent of prior Mars studies.
The gamma-ray and neutron spectrometer detected neutron signatures from Mars at an encounter distance of 2,864 miles, confirming the instrument’s functionality for later elemental analysis at the asteroid. The magnetometer, operational since launch in 2023, recorded the magnetic signature of Mars and observed the planet’s bow shock region where solar wind interacts with the Martian magnetic field. The multispectral imager captured a time-lapse sequence of Mars as Psyche approached and departed, revealing surface features including craters and polar ice caps, and successfully detecting the moons Phobos and Deimos as a test for future satellite detection at the asteroid.
Researchers compared Psyche’s observations with data from multiple Mars orbiters and rovers operated by NASA, the European Space Agency, and the United Arab Emirates to calibrate the imaging system. The navigation team confirmed that Psyche is on its planned trajectory following the gravity assist. The spacecraft is scheduled to resume thrusting with its solar-electric propulsion system later in the year as it continues toward the asteroid rendezvous.
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