Asteroid 16 Psyche may be the naked core of a protoplanet that lost its mantle billions of years ago in a collision. Normally, a planetary core lies beneath thousands of kilometers of rock. On August 5, 2029, NASA's Psyche spacecraft will directly observe it for the first time. It accomplished an important intermediate step on May 15, 2026: a Mars flyby that gave it sufficient speed for the rest of its journey. The first images are now available.
What is the Psyche mission actually?
NASA's Psyche spacecraft launched from Kennedy Space Center in Florida in October 2023. Its target is asteroid 16 Psyche in the main asteroid belt between Mars and Jupiter, approximately 280 kilometers in diameter. What distinguishes it from most other asteroids: according to radar analysis, it consists primarily of iron and nickel rather than rock or ice.
The prevailing hypothesis holds that Psyche is the exposed core of an early planetesimal. In the solar system's formation era, planetary building blocks called planetesimals formed from material accumulations. When one planetesimal collided with another, enormous collisions could strip away outer layers, leaving only the iron core. If this hypothesis is correct, Psyche offers a unique opportunity: the first direct examination of a planetary core. Earth's core lies more than 5,000 kilometers below the surface and will remain unreachable in any foreseeable future.
The spacecraft carries three scientific instruments. A magnetometer will measure whether Psyche possesses residual magnetism, indicating past dynamo activity like Earth's core. A gamma-ray and neutron spectrometer will analyze surface chemical composition. Two multispectral cameras take images in visible light and near-infrared. Technically, the spacecraft is a premiere: Psyche is the first NASA interplanetary mission powered entirely by solar-driven Hall-effect thrusters. These ion thrusters accelerate xenon gas with electric current for thrust; they are highly efficient but only practical over long distances.
Why this Mars flyby?
A gravity assist uses a planet's gravity as a natural acceleration mechanism without consuming fuel. On May 15, 2026, at approximately 12:03 UTC, Psyche passed Mars at a minimum distance of 4,609 kilometers. This roughly equals the distance from Berlin to Casablanca. The flyby gave the spacecraft a speed increase of approximately 1,600 kilometers per hour and shifted its orbital plane by roughly one degree relative to the sun.
Ion thrusters alone would not have achieved this boost. The gravity assist is therefore not a detour but an integral part of the route. All three scientific instruments actively collected data and images during the flyby, though this is not the mission's primary purpose. Raw data was released with only hours of delay.
What the images show
The most striking image from the Mars passage shows Huygens crater near the Martian equator. It measures 470 kilometers across and exhibits concentric ring structures testifying to an extraordinarily violent early impact. Images of Mars's south polar cap and wide-angle views of the entire planet were also released. Mission scientists noted sharpness that surprised them given the brief encounter duration.
The images also provide scientific data about Mars entering the global archive of Mars research. This was not originally planned as a primary objective, but it illustrates an advantage of deep space exploration: even the path to the actual target generates useful results.
Regarding the often-cited valuation of the asteroid: a 2017 calculation estimates Psyche's theoretical metal value at up to ten quintillion dollars, a number with 19 digits. This figure is a curiosity, not a realistic assessment. Linda Elkins-Tanton, the mission's lead scientist, has repeatedly emphasized that even the hypothetical possibility of bringing the metal to Earth would immediately collapse world metal markets. The mission pursues not economic but scientific questions: how did the rocky planets of the inner solar system form?
August 2029: three years to the surface of a lost core
On August 5, 2029, Psyche will reach the asteroid and enter orbit. The orbital phase will last 817 days according to current plans, concluding in late October 2031. During this period, the spacecraft will gradually descend into tighter orbits to examine the surface from increasingly closer distances. The magnetometer will clarify whether residual magnetism exists, permitting conclusions about the object's thermal history. If Psyche truly is a former planetary core, the mission will deliver what theories have thus far only described: direct measurement of the matter comprising the interior of rocky planets.