NASA's DART Mission Successfully Alters Asteroid's Orbit
NASA's DART spacecraft has successfully changed the orbit of asteroid Dimorphos, marking the first time a human-made object has altered a celestial body's trajectory.
NASA's Double Asteroid Redirection Test (DART) mission has achieved a significant milestone by successfully altering the orbit of the asteroid Dimorphos. This marks the first instance of a human-made object changing the trajectory of a celestial body.
In September 2022, the DART spacecraft intentionally collided with Dimorphos, a 560-foot-wide asteroid that orbits a larger companion, Didymos. The impact not only shortened Dimorphos' orbit around Didymos by approximately 33 minutes but also affected the binary system's orbit around the Sun, reducing it by 0.15 seconds.
"This is a tiny change to the orbit, but given enough time, even a tiny change can grow to a significant deflection," said Thomas Statler, lead scientist for solar system small bodies at NASA Headquarters in Washington.
The collision ejected a substantial amount of debris into space, effectively doubling the momentum transferred to Dimorphos. This outcome underscores the potential of kinetic impactors as a viable method for planetary defense against hazardous asteroids.
To enhance future planetary defense capabilities, NASA is developing the Near-Earth Object (NEO) Surveyor mission. Managed by NASA's Jet Propulsion Laboratory, this next-generation space survey telescope aims to detect and characterize near-Earth objects, including those that are difficult to observe due to low reflectivity.