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This image depicts the footprint of the Double Asteroid Redirection Test (DART) spacecraft and its two long solar panels over the spot where it impacted asteroid Dimorphos. The largest boulder near the impact site is about 6.5 meters (21 feet) across. DART took the underlying image three seconds before impact. Credit: NASA/Johns Hopkins APL
Since NASA's Double Asteroid Redirection Test (DART) successfully impacted its target over five months ago, on Sept. 26 — altering the orbit of the asteroid moonlet Dimorphos by a whopping 33 minutes — the DART team has been hard at work analyzing the data collected from the world's first planetary defense test mission.
The DART mission employed an asteroid-deflection technique known as a "kinetic impactor," which in simplest terms means smashing a thing into another thing — in this case, a spacecraft into an asteroid. From the data, the DART investigation team, led by the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, found that a kinetic impactor mission like DART can be effective in altering the trajectory of an asteroid, a big step toward the goal of preventing future asteroid strikes on Earth. These findings were published in four papers in the journal Nature.
"I cheered when DART slammed head on into the asteroid for the world's first planetary defense technology demonstration, and that was just the start," said Nicola Fox, associate administrator for the Science Mission Directorate at NASA Headquarters in Washington. "These findings add to our fundamental understanding of asteroids and build a foundation for how humanity can defend Earth from a potentially hazardous asteroid by altering its course."
The first paper reports DART's successful demonstration of kinetic impactor technology in detail: reconstructing the impact itself, reporting the timeline leading up to impact, specifying in detail the location and nature of the impact site, and recording the size and shape of Dimorphos.
The authors, led by Terik Daly, Carolyn Ernst and Olivier Barnouin of APL, note DART's successful autonomous targeting of a small asteroid, with limited prior knowledge, is a critical first step on the path to developing kinetic impactor technology as a viable operational capability for planetary defense.
Their findings show that intercepting an asteroid with a diameter of less than a kilometer, such as Dimorphos, can be achieved without an advance reconnaissance mission, although advance reconnaissance would give valuable information for planning and predicting the outcome. What is necessary is sufficient warning time — several years at a minimum, but preferably decades. "Nevertheless," the authors state, DART's success "builds optimism about humanity's capacity to protect the Earth from an asteroid threat."
When the DART spacecraft slammed into asteroid Dimorphos, the spacecraft body hit between two large boulders while its two solar panels impacted those boulders. The yellow surface is a digital terrain model of the impact site made from DART images, and the rendering of the DART spacecraft depicts its position a few tens of microseconds before impact. The white line extending from the back of the spacecraft shows the spacecraft’s trajectory. The spacecraft body, or bus, was about 1.3 meters (4.3 feet) from front to back.
Credit: NASA/Johns Hopkins APL
This video shows images acquired by the Hubble Space Telescope starting at 1.3 hours before DART’s impact to 18.5 days after impact.
Download MP4 | Credit: NASA/European Space Agency/Space Telescope Science Institute/Hubble Space Telescope
In the second paper, using two independent approaches based on Earth-based light curve and radar observations, the investigation team, led by Cristina Thomas of Northern Arizona University, arrived at two consistent measurements of the period change from the kinetic impact: 33 minutes, plus or minus one minute. This large change indicates the recoil from material excavated from the asteroid and ejected into space by the impact (known as ejecta) contributed significant momentum change to the asteroid, beyond that of the DART spacecraft itself.
The key to kinetic impact is that the push to the asteroid comes not only from colliding spacecraft but also from this ejecta recoil. The authors conclude: "To serve as a proof-of-concept for the kinetic impactor technique of planetary defense, DART needed to demonstrate that an asteroid could be targeted during a high-speed encounter and that the target's orbit could be changed. DART has successfully done both."
In the third paper, the investigation team, led by Andrew Cheng of APL, calculated the momentum change transferred to the asteroid as a result of DART's kinetic impact by studying the change in the orbital period of Dimorphos. They found that the impact caused an instantaneous slowing in Dimorphos' speed along its orbit of about 2.7 millimeters per second — again indicating that the recoil from ejecta played a major role in amplifying the momentum change directly imparted to the asteroid by the spacecraft. That momentum change was amplified by a factor of 2.2 to 4.9 (depending on the mass of Dimorphos), indicating the momentum change transferred because of ejecta production significantly exceeded the momentum change from the DART spacecraft alone.
This finding "[validates] the effectiveness of kinetic impact for preventing future asteroid strikes on the Earth," the authors conclude.
DART's scientific value goes beyond validating kinetic impactor as a means of planetary defense. By smashing into Dimorphos, the mission has broken new ground in the study of asteroids. DART's impact made Dimorphos an "active asteroid" — a space rock that orbits like an asteroid but has a tail of material like a comet — which is detailed in the fourth paper led by Jian-Yang Li of the Planetary Science Institute.
Although scientists had proposed that some active asteroids are the result of impact events, until now no one had ever observed the activation of an asteroid. The DART mission activated Dimorphos under precisely known and carefully observed impact conditions, enabling the detailed study of the formation of an active asteroid for the first time.
"DART, as a controlled, planetary-scale impact experiment, provides a detailed characterization of the target, the ejecta morphology and the entire ejecta evolution process," the authors write. "DART will continue to be the model for studies of newly discovered asteroids that show activity caused by natural impacts."
"We are so proud of the DART team and the investigation's latest results," said Jason Kalirai, Civil Space Mission Area Executive at APL. "With the core analysis activities starting after the impact of Dimorphos, the results demonstrate how successful the kinetic impactor technique can be — paving the way for a bright future for planetary defense."
"I'd like to thank and congratulate the team for all the work that went into producing these studies," said Andy Rivkin, an APL planetary scientist who leads the DART investigation team. "A mere five months after impact, we've published key results from our pioneering planetary defense mission. I am grateful to everyone who has contributed to this achievement, and to those who will continue to extend DART's legacy into the future."
Johns Hopkins APL manages the DART mission for NASA's Planetary Defense Coordination Office as a project of the agency's Planetary Missions Program Office. The LICIACube project is managed by ASI Robotic Exploration Mission Office, with industrial contractor Argotec S.r.I. and a scientific team from the National Institute of Astrophysics, Polytechnic University of Milan, the University of Bologna, the University of Naples Parthenope and CNR-IFAC.