NASA’s Psyche Probe Prepares for High-Stakes Mars Slingshot: 2,800 Miles from the Red Planet

PASADENA, CA — On Friday, May 15, 2026, NASA’s Psyche spacecraft will execute one of the most critical maneuvers of its six-year journey. The probe is set to scream past Mars at over 12,000 mph, coming within just 2,800 miles (4,500 kilometers) of the Martian surface.

While the mission's ultimate destination is the metal-rich asteroid 16 Psyche, this mid-journey "pit stop" is essential for the spacecraft to reach the main asteroid belt by 2029.

---

The "Cosmic Slingshot": Why Mars?

The primary goal of the May 15 flyby is a gravity assist. By flying deep into Mars’ gravitational well, the spacecraft will steal a fraction of the planet's orbital momentum to boost its own speed and tilt its trajectory.

• Propellant Savings: Psyche uses a solar-electric (Hall effect) propulsion system that consumes xenon gas. This gravitational "nudge" allows the probe to gain significant velocity without burning through its limited supply of propellant.

• Trajectory Correction: The encounter will pivot the spacecraft’s path, aiming it precisely toward the asteroid belt between Mars and Jupiter.

---

What to Expect During the Flyby

The mission team at NASA’s Jet Propulsion Laboratory (JPL) is using this rare close encounter to put the spacecraft’s scientific "eyes and ears" to the test.

1. Imaging the Red Planet

The spacecraft’s multispectral imager has already begun capturing raw images of Mars as a tiny point of light. However, the view on May 15 will be unique:

• The Dark Side: Psyche is approaching Mars from its night side. On the approach, scientists expect to see Mars as an incredibly thin, glowing crescent.

• The "Full Mars" Reveal: Once the probe swings around the planet and begins its departure, it will capture a "full" phase view of Mars, providing a perfect opportunity to calibrate the camera's filters and exposure settings.

2. Searching for "Ghost" Rings and Moonlets

Scientists suspect Mars might be surrounded by a faint, elusive dust ring (or torus) created by micrometeorites hitting its moons, Phobos and Deimos. The high-phase angle of the flyby—where sunlight hits the planet from behind—is the ideal lighting to reveal such faint structures. Additionally, the team will perform a "satellite search" to practice the techniques they will use to find moonlets around the asteroid Psyche in 2029.

3. Magnetic and Radiation Testing

• Magnetometer: Will detect how Mars’ magnetic field interacts with the solar wind.

• Gamma-Ray and Neutron Spectrometer: Will monitor cosmic ray flux, helping the team understand the radiation environment of deep space.

---

Mission Timeline: The Road to a Metal World

Launched in October 2023, the Psyche mission is a journey to what scientists believe is the exposed nickel-iron core of an ancient planetesimal—a building block of a planet that lost its rocky outer layers billions of years ago.

Milestone	Date	Status
Launch	Oct 13, 2023	Completed
Mars Flyby	May 15, 2026	Upcoming
Arrival at 16 Psyche	August 2029	Planned
End of Prime Mission	Nov 2031	Planned

---

How to Follow the Event

NASA will track the flyby using the Deep Space Network (DSN). Engineers will monitor the "Doppler shift" in the spacecraft's radio signals—a change in frequency caused by its rapid acceleration—to confirm the maneuver's success in real-time.

While the flyby won't be visible to the naked eye from Earth, NASA is expected to release the first high-resolution processed images and time-lapse footage from the encounter in the days following May 15.

The mission's principal investigator, Lindy Elkins-Tanton, summed up the excitement:

"Ultimately, the only reason for this flyby is to get a little help from Mars... but it’s also our first chance to see our instruments work on a planetary scale. It’s a huge moment for the team."

The Psyche mission represents the first time humans will visit a world made not of rock or ice, but of metal. This week’s Martian encounter is the final major "push" needed to get there.