NASA's Psyche Spacecraft to Skim Mars at Razor-Thin Distance for Asteroid Trajectory Boost
NASA's Psyche spacecraft will execute a high-risk gravity assist flyby of Mars on May 15, 2026, passing within 2,800 miles of the planet's surface -- a margin so tight it will thread between the orbits of both Martian moons. The maneuver is essential to redirect the probe toward its destination: a metal-rich asteroid in the main belt thought to be the exposed core of a proto-planet.
The spacecraft has already begun its approach sequence, capturing crescent-phase images of Mars on May 11 as it streaks toward the planet at approximately 23,000 miles per hour. This gravity assist is not optional refinement -- it is the mechanism that will inject Psyche onto its final trajectory, roughly 1.5 billion miles from Earth. Without this single Mars encounter, the mission cannot reach its target asteroid by 2029.
Psyche launched in October 2023 and has been coasting through interplanetary space for more than two years. The mission aims to study a singular astronomical object: asteroid 16 Psyche, a 140-mile-wide body of largely exposed iron and nickel orbiting in the asteroid belt between Mars and Jupiter. Scientists believe 16 Psyche is the shattered remnant of a planetary core from the early solar system -- a window into the composition of terrestrial planet interiors. The asteroid's metallic composition alone has drawn outsized public attention, with speculative valuations in the quintillions of dollars, though extracting ore from deep space remains purely theoretical.
The May 15 closest approach places Psyche at 1.3 Mars radii from the planet's center, a distance that brings it well inside the orbital paths of Phobos and Deimos, Mars' two small moons. To contextualize the tightness of this encounter: the International Space Station orbits Earth at roughly 250 miles altitude. Psyche will be 2,800 miles from Mars' surface, technically in deep space but substantially closer than most planetary flybys conducted in recent decades. The spacecraft's trajectory is controlled through a combination of pre-loaded commands and autonomous navigation systems that interpret radio signals from Earth and stellar observations.
The margin for error is unforgiving. A navigational deviation of even tenths of a degree could push Psyche off course by hundreds of thousands of miles downstream, jeopardizing the entire asteroid rendezvous scheduled for late 2029. Mission control at NASA's Jet Propulsion Laboratory has used optical navigation techniques and Deep Space Network observations to refine the approach vector repeatedly over the past months. The spacecraft will conduct course corrections as needed, but the core trajectory is now essentially locked in.
Success of the Mars flyby will validate the mission's capability to execute precision celestial mechanics at interplanetary scales. It will also mark a critical inflection point for the Psyche mission itself -- clearing the final major navigation hurdle before the science phase begins in earnest around the metal asteroid.
The spacecraft will transmit detailed data from the Mars encounter, providing updated imagery and instrument readings that will help engineers confirm the vehicle's health before the long, quiet coast toward the asteroid belt begins in earnest.