NASA’s DART spacecraft changed Dimorphos’s orbit around its companion asteroid Didymos by more than half an hour, and its impact also nudged the pair’s orbit around the Sun. Follow-up studies reveal why: Dimorphos is a young, weak body made largely of loose rock and rubble, so material blasted into space added recoil to the spacecraft’s impact. The mission demonstrated a way to deflect an asteroid, not a guarantee that every asteroid would respond the same way.
What did DART hit, and when?
DART—NASA’s Double Asteroid Redirection Test—deliberately struck Dimorphos, an approximately 160-meter (530-foot) moonlet orbiting the larger asteroid Didymos. The collision took place on September 26, 2022, at 23:14 UTC (September 27 in Eastern Daylight Time). It was the first full-scale test of using a kinetic impactor to change an asteroid’s motion.
Launched aboard a SpaceX Falcon 9 on November 24, 2021, DART traveled for more than 10 months. Near its target, it used onboard DRACO imaging and SMART Nav autonomous navigation to identify and steer toward Dimorphos. The spacecraft hit at roughly 22,530 km/h. The Italian Space Agency’s LICIACube satellite, along with telescopes on Earth and in space, observed the resulting plume and tails.
How much did DART move Dimorphos?
The orbit around Didymos
Dimorphos orbits Didymos; the mission did not knock the moonlet out of the binary system. NASA’s first post-impact measurements found that Dimorphos’s orbital period had shortened by 32 ± 2 minutes. That surpassed the mission’s minimum success criterion of a 73-second change by more than 25 times.
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As more material continued to escape after the collision, the period decreased further before settling at 11 hours, 22 minutes, and 3 seconds—33 minutes and 15 seconds shorter than before impact. The final NASA/APL technical report gives a refined change of −33.24 ± 1.4 minutes. JPL scientist Steve Chesley described the pre-impact timing of orbital events as regular, consistent with a circular orbit.
The binary system’s orbit around the Sun
A separate result concerns the motion of the Didymos–Dimorphos pair around the Sun, not Dimorphos’s orbit around Didymos. NASA’s 2026 analysis found that DART changed the pair’s roughly 770-day solar orbital period by 0.15 seconds. NASA describes this as the first measured human-made alteration of a celestial body’s orbit around the Sun. The change is tiny, but a small alteration can accumulate over time; NASA scientist Thomas Statler noted that, given enough time, it can grow into a significant deflection.
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Why did the impact move Dimorphos so much?
DART’s spacecraft transferred momentum directly when it hit. The collision also blasted rock and dust away from Dimorphos. That ejecta carried momentum in the opposite direction, adding recoil and amplifying the change in the moonlet’s motion beyond the spacecraft’s push alone.
The size of that amplification depends on how it is calculated and which result is being discussed. NASA’s analysis of the pair’s solar orbit describes a momentum enhancement of about two. The final NASA/APL technical report records a momentum-transfer enhancement factor, beta, of 3.6 for its refined period analysis. These are results from different analyses, so they should not be collapsed into one universal value for every asteroid impact.
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What do the newer studies reveal about the asteroids?
Dimorphos is a young rubble pile
A 2024 NASA Science synthesis of five Nature Communications papers describes Dimorphos as a weak, boulder-strewn body with loose surface material. NASA estimates its surface age at less than 300,000 years—young compared with Didymos, whose estimated surface age is about 12.5 million years. This structure helps explain why the impact produced substantial ejecta and why the ejecta’s recoil mattered.
The synthesis also points to thermal fatigue as a process that may crack Dimorphos’s boulders rapidly. The impact therefore tested deflection on a surface and interior that are not like a single solid block.
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Dimorphos may have formed from Didymos
The studies support a formation scenario in which Didymos spun up, developed an equatorial ridge, and shed material that gathered into Dimorphos. This rotational mass-shedding explanation links the younger moonlet’s origin to the older primary asteroid rather than treating the pair as unrelated bodies.
The two asteroids also have different observed surface features. Didymos appears smoother at low elevations and more heavily cratered at high elevations. NASA’s synthesis estimates that its bearing capacity is at least 1,000 times lower than that of dry sand or lunar soil, an indication of how weak the material is under load. Statler said the findings offer new insight into how asteroids change over time.
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Does DART prove asteroid impacts can protect Earth?
DART validates kinetic impact as a real deflection technique: a spacecraft can deliberately collide with an asteroid and measurably change its motion. But the test does not establish that the same spacecraft, impact speed, or momentum enhancement would work equally well on a stronger, more coherent asteroid. Dimorphos’s weak rubble-pile structure and the large contribution from escaping ejecta are important to interpreting the result.
Neither Didymos nor Dimorphos threatens Earth. DART was a planetary-defense demonstration, not an emergency response to an incoming object. Its broader lesson is that a deflection must be understood in terms of a particular target’s size, structure, and orbit; the outcome measured at Dimorphos cannot simply be assumed for every potential threat.
What happens next at the impact site?
ESA’s Hera mission was planned to revisit the Didymos system in 2026 to measure the impact crater, the bodies’ mass, and how the collision reshaped Dimorphos. Those measurements can help connect the observed orbital change to the physical damage and the asteroid’s internal structure.
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