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NASA's Psyche Spacecraft Completes Mars Flyby, Continues Toward Metal-Rich Asteroid

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NASA's Psyche Spacecraft Completes Mars Gravity Assist

The spacecraft is now on course to arrive at asteroid 16 Psyche in August 2029, where it will conduct a two-year orbital study.

"The gravity assist increased the probe's velocity by approximately 1,000 miles per hour and shifted its orbital plane by about 1 degree relative to the Sun."

Flyby Details

The Psyche spacecraft performed a successful gravity assist flyby of Mars on May 15, 2026, using the planet's gravitational pull to adjust its trajectory toward the asteroid 16 Psyche.

The spacecraft passed within approximately 2,800 miles (4,500 kilometers) of Mars's surface at a speed of 12,333 mph (19,848 kph). Post-flyby data confirmed a closest approach distance of 2,864 miles (4,609 kilometers).

Radio signals between the spacecraft and NASA's Deep Space Network (DSN) confirmed the correct trajectory following the maneuver. A trajectory correction burn was previously performed on February 23, 2026, involving 12 hours of thruster firing to refine the approach.

Scientific Observations

During the flyby, all of the spacecraft's science instruments were activated, including its multispectral imager, magnetometers, and gamma-ray/neutron spectrometer. The instruments collected data for calibration purposes.

The spacecraft's cameras captured thousands of images of Mars, including:

  • High-resolution views of the south polar cap
  • The Valles Marineris canyon system
  • Wind streaks in the Syrtis Major region
  • Huygens crater

The spacecraft approached Mars at a high phase angle, capturing the planet as a thin crescent before closest approach. The crescent appeared brighter and extended further than expected due to Martian dust scattering light.

Early magnetometer measurements may have detected Mars's "bow shock," a boundary region related to solar wind dynamics.

Coordinated Observations

Multiple Mars orbiters and rovers conducted simultaneous observations for comparison, including:

  • NASA's Perseverance rover and Curiosity rover
  • Mars Reconnaissance Orbiter and Mars Odyssey orbiter
  • ESA's Mars Express and ExoMars Trace Gas Orbiter

Instrument Calibration

The flyby served as a calibration opportunity for the spacecraft's instruments before its arrival at the asteroid. The images will be used to calibrate camera performance and test image-processing tools developed for the asteroid Psyche.

The spacecraft also tested its Deep Space Optical Communications (DSOC) system, which uses laser-beaming to transmit data to Earth.

Mission Background

The Psyche spacecraft launched in October 2023 and uses solar electric propulsion with xenon gas thrusters. The spacecraft is van-sized.

The mission targets asteroid 16 Psyche, located in the main asteroid belt between Mars and Jupiter. The asteroid is approximately 173 miles (278 kilometers) long and 144 miles (232 kilometers) wide, making it the largest known metallic asteroid and the 10th-most massive in the main belt.

Hypotheses on Psyche's Formation

Several hypotheses exist for Psyche's origin:

  • It may be a remnant building block of an early planet, fragmented by collisions
  • It could be a planetary fragment that once had separated layers but lost its rocky outer mantle
  • It might be an ancient remnant that either began as metal-rich or became a mix of rock and metal after repeated impacts

"Scientists hypothesize the asteroid may be the exposed nickel-iron core of a protoplanet that lost its outer layers through collisions."

This could potentially offer insights into the interiors of terrestrial planets like Earth and Mars.

Pre-Mission Simulations

Researchers at the University of Arizona's Lunar and Planetary Laboratory conducted simulations of a large crater near Psyche's north pole to better understand the asteroid's interior structure.

Published in JGR Planets, the study simulated the formation of a crater approximately 30 miles across and 3 miles deep at typical asteroid belt collision speeds (about 3 miles per second).

Key findings include:

  • An impactor approximately 3 miles across would create a crater matching the known dimensions
  • The crater's formation is consistent with both layered (metallic core with thin rocky mantle) and mixed composition scenarios
  • Porosity significantly influences crater formation, leading to deeper, steeper craters with less ejected material in more porous bodies

The simulations predict observable features such as density variations from interior compression by impacts and the distribution of metal-rich debris on the surface.

Mission Management

The Psyche mission is led by Arizona State University. NASA's Jet Propulsion Laboratory manages the mission. Intuitive Machines (formerly Maxar Technologies) provided the spacecraft chassis. The mission is the 14th in NASA's Discovery Program.