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El impacto de DART cambió el movimiento de un asteroide en el espacio
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By NASA
The asteroid Dimorphos was captured by NASA’s DART mission just two seconds before the spacecraft struck its surface on Sept. 26, 2022. Observations of the asteroid before and after impact suggest it is a loosely packed “rubble pile” object.NASA/Johns Hopkins APL After NASA’s historic Double Asteroid Redirection Test, a JPL-led study has shown that the shape of asteroid Dimorphos has changed and its orbit has shrunk.
When NASA’s DART (Double Asteroid Redirection Test) deliberately smashed into a 560-foot-wide (170-meter-wide) asteroid on Sept. 26, 2022, it made its mark in more ways than one. The demonstration showed that a kinetic impactor could deflect a hazardous asteroid should one ever be on a collision course with Earth. Now a new study published in the Planetary Science Journal shows the impact changed not only the motion of the asteroid, but also its shape.
DART’s target, the asteroid Dimorphos, orbits a larger near-Earth asteroid called Didymos. Before the impact, Dimorphos had a roughly symmetrical “oblate spheroid” shape – like a squashed ball that is wider than it is tall. With a well-defined, circular orbit at a distance of about 3,900 feet (1,189 meters) from Didymos, Dimorphos took 11 hours and 55 minutes to complete one loop around Didymos.
“When DART made impact, things got very interesting,” said Shantanu Naidu, a navigation engineer at NASA’s Jet Propulsion Laboratory in Southern California, who led the study. “Dimorphos’ orbit is no longer circular: Its orbital period” – the time it takes to complete a single orbit – “is now 33 minutes and 15 seconds shorter. And the entire shape of the asteroid has changed, from a relatively symmetrical object to a ‘triaxial ellipsoid’ – something more like an oblong watermelon.”
This illustration shows the approximate shape change that the asteroid Dimorphos experienced after DART hit it. Before impact, left, the asteroid was shaped like a squashed ball; after impact it took on a more elongated shape, like a watermelon.NASA/JPL-Caltech Dimorphos Damage Report
Naidu’s team used three data sources in their computer models to deduce what had happened to the asteroid after impact. The first source was aboard DART: The spacecraft captured images as it approached the asteroid and sent them back to Earth via NASA’s Deep Space Network (DSN). These images provided close-up measurements of the gap between Didymos and Dimorphos while also gauging the dimensions of both asteroids just prior to impact.
The second data source was the DSN’s Goldstone Solar System Radar, located near Barstow, California, which bounced radio waves off both asteroids to precisely measure the position and velocity of Dimorphos relative to Didymos after impact. Radar observations quickly helped NASA conclude that DART’s effect on the asteroid greatly exceeded the minimum expectations.
The third and most significant source of data: ground telescopes around the world that measured both asteroids’ “light curve,” or how the sunlight reflecting off the asteroids’ surfaces changed over time. By comparing the light curves before and after impact, the researchers could learn how DART altered Dimorphos’ motion.
As Dimorphos orbits, it periodically passes in front of and then behind Didymos. In these so-called “mutual events,” one asteroid can cast a shadow on the other, or block our view from Earth. In either case, a temporary dimming – a dip in the light curve – will be recorded by telescopes.
See the DART impact with NASA’s Eyes on the Solar System “We used the timing of this precise series of light-curve dips to deduce the shape of the orbit, and because our models were so sensitive, we could also figure out the shape of the asteroid,” said Steve Chesley, a senior research scientist at JPL and study co-author. The team found Dimorphos’ orbit is now slightly elongated, or eccentric. “Before impact,” Chesley continued, “the times of the events occurred regularly, showing a circular orbit. After impact, there were very slight timing differences, showing something was askew. We never expected to get this kind of accuracy.”
The models are so precise, they even show that Dimorphos rocks back and forth as it orbits Didymos, Naidu said.
Orbital Evolution
The team’s models also calculated how Dimorphos’ orbital period evolved. Immediately after impact, DART reduced the average distance between the two asteroids, shortening Dimorphos’ orbital period by 32 minutes and 42 seconds, to 11 hours, 22 minutes, and 37 seconds.
Over the following weeks, the asteroid’s orbital period continued to shorten as Dimorphos lost more rocky material to space, finally settling at 11 hours, 22 minutes, and 3 seconds per orbit – 33 minutes and 15 seconds less time than before impact. This calculation is accurate to within 1 ½ seconds, Naidu said. Dimorphos now has a mean orbital distance from Didymos of about 3,780 feet (1,152 meters) – about 120 feet (37 meters) closer than before impact.
“The results of this study agree with others that are being published,” said Tom Statler, lead scientist for solar system small bodies at NASA Headquarters in Washington. “Seeing separate groups analyze the data and independently come to the same conclusions is a hallmark of a solid scientific result. DART is not only showing us the pathway to an asteroid-deflection technology, it’s revealing new fundamental understanding of what asteroids are and how they behave.”
These results and observations of the debris left after impact indicate that Dimorphos is a loosely packed “rubble pile” object, similar to asteroid Bennu. ESA’s (European Space Agency) Hera mission, planned to launch in October 2024, will travel to the asteroid pair to carry out a detailed survey and confirm how DART reshaped Dimorphos.
More About the Mission
DART was designed, built, and operated by the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland, for NASA’s Planetary Defense Coordination Office, which oversees the agency’s ongoing efforts in planetary defense. DART was humanity’s first mission to intentionally move a celestial object.
JPL, a division of Caltech in Pasadena, California, manages the DSN for NASA’s Space Communications and Navigation (SCaN) program within the Space Operations Mission Directorate at the agency’s headquarters in Washington.
NASA’s Asteroid-Striking DART Mission Team Has JPL Members Classroom Activity: How to Explore an Asteroid NASA’s Planetary Radar Captures Detailed View of Oblong Asteroid News Media Contacts
Ian J. O’Neill
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-2649
ian.j.oneill@jpl.nasa.gov
Karen Fox / Charles Blue
NASA Headquarters
karen.c.fox@nasa.gov / charles.e.blue@nasa.gov
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Last Updated Mar 19, 2024 Related Terms
DART (Double Asteroid Redirection Test) Asteroids Jet Propulsion Laboratory Modeling Near-Earth Asteroid (NEA) Planetary Defense Planetary Defense Coordination Office Explore More
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By European Space Agency
ESA’s Hera spacecraft for planetary defence is being prepared for a journey to the distant asteroid moon Dimorphos orbiting around its parent body Didymos. One of the first features Hera will look for is the crater left on Dimorphos by its predecessor mission DART, which impacted the asteroid to deflect its orbit. Yet a new impact simulation study reported in Nature Astronomy today suggests no crater will be found. The DART impact is likely to have remodelled the entire body instead – a significant finding for both asteroid science and planetary defence.
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By NASA
3 min read
DART Team Earns Smithsonian Michael Collins Trophy for Successful Planetary Defense Test Mission
Eric Long, Smithsonian’s National Air and Space Museum NASA’s Double Asteroid Redirection Test (DART) will be honored with the 2024 Michael Collins Trophy for Current Achievement. For its work developing and managing the first-ever planetary defense test mission, the team comprised by NASA’s Planetary Defense Coordination Office (PDCO) and the Johns Hopkins Applied Physics Laboratory (APL) is being lauded for outstanding achievements in the fields of aerospace science and technology.
Designed, built and operated by APL for NASA’s PDCO, which oversees the agency’s ongoing efforts in planetary defense, DART was humanity’s first mission to intentionally move a celestial object, impacting the asteroid Dimorphos on Sept. 26, 2022. DART’s collision with Dimorphos changed the asteroid’s orbit period around its companion asteroid, Didymos, by 33 minutes.
“Our planetary defense objective is to find any potential asteroid impact many years to decades before it could happen so that, if ever necessary, the object could be deflected with technology tested by DART,” said Lindley Johnson, planetary defense officer at NASA Headquarters. “The DART team was an international collaboration of planetary defenders who turned the kinetic impact concept of asteroid deflection into reality. Their efforts have taken a giant leap forward for humanity’s ability to address the asteroid impact hazard.”
The Smithsonian’s National Air and Space Museum awards its Michael Collins Trophy yearly for both Current and Lifetime Achievements. The DART mission has earned the former, joining astronaut Peggy Whitson, who will collect the 2024 Lifetime Achievement Award for her distinguished space career.
Since 1985, the organization has been recognizing extraordinary accomplishments in aeronautics and spaceflight, and it selected DART for its “extraordinary technological advancements and new scientific breakthroughs in space science.”
Launched in November 2021 from Vandenberg Space Force Base in California atop a SpaceX Falcon 9 rocket, DART embarked on a 10-month journey to Dimorphos. This historic mission showcased the world’s first planetary defense technology demonstration in action as it was live streamed by NASA online when the DART spacecraft intentionally collided with its target asteroid.
Scientists worldwide monitored the aftermath through telescopes and radar facilities to assess the impact on Dimorphos’ orbit around Didymos. Pre-impact projections estimated a range of possible deflections, and the postimpact observations revealed a significant deflection of the target asteroid at the high-end of the pre-impact models, a promising result for applying the technique in the future if needed.
Images captured by DART’s onboard Didymos Reconnaissance and Asteroid Camera for Optical navigation(DRACO) and the Italian Space Agency’s ride-along Light Italian CubeSat for Imaging of Asteroids(LICIACube), complemented by observations from ground-based telescopes as well as NASA’s James Webb Space Telescope, Hubble Space Telescope and the Lucy spacecraft, provided critical data. These observations allowed scientists to analyze Dimorphos’ surface composition, the material ejection velocity and quantity due to the collision, and the distribution of particle sizes within the ensuing dust cloud. Scientists on the mission confirmed in four subsequent papers published in Nature the effectiveness of the kinetic impactor technique in altering asteroid trajectories, making it a groundbreaking milestone for planetary defense. Look back at all of DART’s milestones and science successes in the year since impact.
More information about the Michael Collins Trophy and a complete list of past winners is available. The DART team will accept the award on March 21, 2024, at the museum’s Steven F. Udvar-Hazy Center in Chantilly, Virginia.
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By European Space Agency
The NASA/ESA Hubble Space Telescope captured a series of photos of rapid changes to the asteroid Dimorphos when it was deliberately hit by a 545-kilogram spacecraft on 26 September 2022. The primary objective of the NASA mission, called DART (Double Asteroid Redirection Test), was to test our ability to alter the asteroid’s trajectory as it orbits its larger companion asteroid, Didymos. Though Dimorphos poses no threat to Earth, data from the mission could help inform researchers how to potentially change an asteroid’s path away from Earth, if ever necessary.
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