Psyche’s Mars detour tested more than navigation

Historical report — NASA reported that Psyche passed 4,609 kilometres above Mars on May 15, 2026. The gravity assist increased its speed and changed its orbital plane. The mission team used Deep Space Network radio signals to confirm the resulting trajectory, a navigation check on the route to its target asteroid. ^[1]

The encounter fitted a longer propulsion plan. NASA’s May 8 preview explained that the spacecraft, launched in October 2023, used solar-electric propulsion with xenon propellant. Letting Mars supply part of the speed and trajectory change conserved propellant. The team also planned instrument observations while passing a comparatively well-studied planet. ^[2]

By July 17, NASA described calibration work using the returned images. The imager team was comparing them with observations from other Mars missions to characterize its cameras. A familiar world supplied a reference for interpreting instrument response, rather than an early measurement of the still-distant asteroid’s composition. ^[3]

The mission’s October 22 update reported that nearly continuous electric thrusting had begun on September 28, with weekly pauses for contact with Earth. Arrival at the asteroid remained planned for summer 2029. The completed Mars encounter and resumed propulsion were progress toward that investigation, with asteroid findings still to come. ^[4]

About this item: Retrospective report. No first-hand reporting or independent testing is claimed. Corrections policy.