Pasadena, California — NASA’s Psyche spacecraft is back on course, resuming its full propulsion capabilities after a pause due to an unexpected issue earlier this year. Engineers successfully addressed a pressure drop in the propulsion system, allowing the spacecraft to continue its journey toward a unique, metal-rich asteroid located in the main asteroid belt.

In April 2025, the Psyche mission experienced a disruption when engineers detected a significant drop in pressure within the thruster system. Although the spacecraft remained stable, the malfunction raised concerns over its trajectory and potential delays in its timeline. The mission team undertook a detailed investigation, ultimately discovering a valve issue within the primary xenon propulsion line. With no straightforward solution to fix the primary system, they swiftly implemented a contingency plan, redirecting operations to a backup xenon line designed into the spacecraft.

This quick adjustment paid off on June 16, when propulsion activities resumed under the backup system. With full propulsion restored, engineers plan to maintain thruster activity for the upcoming months, ensuring that Psyche remains on track for a critical gravity-assist flyby of Mars in May 2026. This flyby is pivotal for increasing the spacecraft’s velocity, enabling it to reach its destination in the asteroid belt without having to recalibrate its trajectory.

Bob Mase, project manager at NASA’s Jet Propulsion Laboratory, praised the mission team’s systematic approach and dedication. “Their thorough diagnosis and recovery demonstrate exceptional teamwork and the robustness of the spacecraft’s design,” he stated, highlighting the importance of redundancy during deep space missions.

The Psyche spacecraft relies on electric propulsion powered by ionized xenon gas, which provides continuous thrust over long durations. This efficient method gradually builds momentum, essential for the spacecraft’s deep space journey. However, maintaining stability in xenon flow and pressure is critical. The recent switch to a backup line underscores the necessity of built-in redundancy in spacecraft engineering—a lesson that reinforces NASA’s proactive approach to designing for potential faults.

Despite this mid-mission hiccup, Psyche is still on schedule to encounter its asteroid target in August 2029. The probe aims to study a rare solar system object that may represent the metallic core of an early planetesimal, offering insights into the origins of rocky planets like Earth. Once achieved, the spacecraft will embark on a comprehensive examination of the asteroid’s surface, magnetic field, and composition.

With propulsion now back online, the team can concentrate on preparing the spacecraft for its scientific mission without worrying about significant trajectory corrections. This swift recovery reflects not only technical expertise but also the mission’s inherent resilience.

The incident exemplifies how effective design and teamwork can turn potential setbacks into success stories. As Psyche continues its voyage across the solar system, it stands as a testament to NASA’s innovative spirit and commitment to exploring the unknown, now boldly powered and ready for the challenges ahead.