NASA has released new findings from its 2022 planetary defense mission, the Double Asteroid Redirection Test (DART), which aimed to assess the feasibility of diverting potentially hazardous asteroids. The mission involved a 570 kg spacecraft colliding with a 170-meter-wide asteroid named Dimorphos, which orbits a larger asteroid, Didymos.
The analysis indicates that the collision not only altered Dimorphos’s orbit but also moved it closer to Didymos, resulting in a reduction of the orbital period of the smaller asteroid. The findings were published in the journal Science Advances under the title “Direct detection of an asteroid’s heliocentric deflection: The Didymos system after DART.”
Impact and Momentum Enhancement
NASA’s summary highlights the concept of the momentum enhancement factor, which quantifies the thrust generated when one object collides with another in space. The momentum enhancement factor for the DART impact was approximately two, indicating that the debris ejected during the collision effectively doubled the impact’s force.
Measurable Changes in Orbital Dynamics
One of the significant findings from the study was that the impact ejected enough material to alter the binary system’s orbital period around the Sun by 0.15 seconds. According to Rahil Makadia, the study’s lead author from the University of Illinois Urbana-Champaign, the change in the binary system’s orbital speed was measured at about 11.7 microns per second, or 1.7 inches per hour.
Long-Term Implications for Planetary Defense
While this change may seem minor, Thomas Statler, NASA’s lead scientist for solar system small bodies, emphasized that even a small alteration in an asteroid’s trajectory can accumulate over time, potentially preventing a hazardous impact with Earth. Statler stated, “This is a tiny change to the orbit, but given enough time, even a tiny change can grow to a significant deflection.”
The methodology employed in this analysis was notable, as it relied on observations from volunteer astronomers who recorded 22 stellar occultations between October 2022 and March 2025. These observations, combined with years of existing data, were crucial in determining how DART affected Didymos’s orbit. Steve Chesley, a senior research scientist at JPL and co-lead of the study, acknowledged the essential role of these volunteers, stating, “This result would not have been possible without the dedication of dozens of volunteer occultation observers around the world.”
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
