NASA's Psyche Spacecraft Makes Close Mars Flyby Today 2026

NASA's Psyche spacecraft is making a close flyby of Mars today, using the Red Planet's gravity to slingshot itself toward its ultimate destination: a metal-rich asteroid. The flyby marks a significant milestone in the mission, which launched in 2023 and is expected to reach the asteroid Psyche in 2029.

At 3:28 PM EDT (21:28 Spanish peninsular time), the spacecraft will pass just 4,500 kilometers from Mars—a stone's throw in cosmic terms. During the encounter, Psyche will snap photos and calibrate its instruments, while also gaining speed for the journey ahead.

Why NASA's Psyche Spacecraft Is Flying by Mars

Psyche's primary goal is to study the asteroid Psyche, a unique metallic world that may be the exposed core of a failed planet. But to get there, the spacecraft needs a gravity assist from Mars. This maneuver will alter its trajectory and boost its speed without expending precious propellant.

Gravity assists are a common technique in space exploration. By flying close to a planet, a spacecraft can steal some of the planet's orbital energy, effectively getting a free ride. In Psyche's case, Mars will act as a slingshot, flinging the spacecraft toward the asteroid belt.

What Happens During the Flyby

As Psyche approaches Mars, its instruments will be turned on to collect data. The spacecraft will use its multispectral imager to take pictures of the Martian surface, which will help engineers calibrate the camera for the asteroid encounter. The magnetometer and gamma-ray spectrometer will also be tested.

These observations are not just practice—they provide valuable scientific data about Mars. The images and measurements will be analyzed by scientists to study the planet's atmosphere and surface composition.

The Gravity Assist Explained

When a spacecraft flies near a planet, it is attracted by the planet's gravity. The planet is also moving around the Sun, so the spacecraft's path is bent, and it gains speed relative to the Sun. This is similar to a ball bouncing off a moving train: the ball picks up speed from the train's motion.

For Psyche, the flyby will change its velocity by about 1.5 kilometers per second, putting it on a faster track to the asteroid. Without this assist, the mission would require significantly more fuel to reach its target.

What This Means for the Psyche Mission

The flyby is a critical step in Psyche's journey. It tests the spacecraft's systems and provides an opportunity to practice operations before the main event. The data collected will help the team fine-tune their plans for the asteroid rendezvous.

After the flyby, Psyche will continue its cruise phase, with another gravity assist from Earth planned for 2026. The spacecraft is scheduled to arrive at the asteroid in 2029 and will spend 21 months orbiting and studying it.

Key Takeaways from the Mars Flyby

• Psyche will pass 4,500 km from Mars, using its gravity to gain speed.
• The flyby allows instrument calibration and tests spacecraft systems.
• Images and data from Mars will be used for scientific research.
• The gravity assist saves fuel and time on the way to the asteroid.
• This is the first of two planned gravity assists for the mission.

Comparing Gravity Assists: Psyche vs. Other Missions

Gravity assists have been used since the early days of space exploration. The Voyager missions used Jupiter's gravity to slingshot past Saturn and Uranus. Cassini used multiple assists to reach Saturn, and New Horizons used Jupiter to get to Pluto faster. The background to this story is set out in Apophis Asteroid 2029 Flyby: Earth's Space Junk Risk Explained. A related thread runs through NASA Voyager 2 Power Boost: Extending Interstellar Mission. Earlier coverage in NASA Gravity Map Reveals Earth's True Lumpy Shape shows how the argument developed.

What to Watch Next for Psyche

After today's flyby, the Psyche team will analyze the data and prepare for the next phase of the mission. The spacecraft will continue to be monitored and tested as it cruises toward the asteroid. In 2026, Psyche will fly by Earth for another gravity assist, which will further adjust its trajectory. A closer look at the same subject appears in NASA Starliner: Astronauts Stranded 9 Months, NASA Still Trusts Boeing. Anyone following the wider picture can start with NASA Sends Three Fully Autonomous Robots to the Moon. The same theme surfaces in NASA Launches Artemis II First Crewed Moon Flyby in Over 50 Years, which takes a different angle.

The mission is expected to reveal new insights into planetary formation and the nature of metallic asteroids. Psyche's target is believed to be the exposed core of a protoplanet, offering a unique window into the building blocks of rocky planets like Earth. Context on how this played out before sits in NASA Perseverance Completes First Fully Autonomous Mars Drives. A companion piece, Geomagnetic Storm Saturation Myth Debunked by NASA Study, approaches the same subject from another angle.

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