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NASA launches mission to crash spacecraft into asteroid

MM News Staff by MM News Staff
November 24, 2021
The DART spacecraft was carried aboard a SpaceX-owned Falcon 9 rocket. Source: NASA/BBC. 

The DART spacecraft was carried aboard a SpaceX-owned Falcon 9 rocket. Source: NASA/BBC. 

LOS ANGELES: A spacecraft that must ultimately crash to succeed was launched from California on a NASA mission to demonstrate the world’s first planetary defense system, designed to deflect an asteroid from a potential doomsday collision with Earth.

The Double Asteroid Redirection Test (DART) spacecraft soared into the night sky at 10:21 PM Pacific time on Tuesday from Vandenberg US Space Force Base, about 150 miles northwest of Los Angeles, carried aboard a SpaceX-owned Falcon 9 rocket.

The DART payload, about the size of a vending machine, was released from the booster a few minutes after launch to begin a 10-month journey into space, some 6.8 million miles (11 million km) from Earth.

Moments later the rocket’s reusable lower stage flew back to Earth and safely touched down on a landing vessel floating in the Pacific in what has become a routine part of the cost-cutting launch sequence pioneered by SpaceX.

DART will fly under the guidance of NASA’s flight directors until the last hours of its odyssey, when control will be handed over to an autonomous onboard navigation system.

The mission’s finale will test spacecraft’s ability to alter an asteroid’s trajectory with sheer kinetic force, plowing into it at high speed to nudge the space boulder off course just enough to keep our planet out of harm’s way.

Cameras mounted on the impactor and on a briefcase-sized mini-spacecraft to be released from DART about 10 days beforehand will record the collision and beam images of it back to Earth.

The asteroid that DART is aiming for poses no actual threat and is tiny compared with the cataclysmic Chicxulub asteroid that struck Earth some 66 million years ago, leading to the extinction of dinosaurs. Scientists say smaller asteroids are far more common and of greater theoretical concern in the near term.

DART’s target is an asteroid “moonlet” the size of a football stadium that orbits a chunk of rock five times larger in a binary asteroid system named Didymos, the Greek word for twin.

READ MORE: NASA launches space probe to study Jupiter’s Trojan asteroids

The team behind DART chose the Didymos system because its relative proximity to Earth and dual-asteroid configuration make it ideal for observing the results of the impact. The plan is to fly the spacecraft directly into the moonlet, called Dimorphos, at 15,000 miles per hour, bumping it hard enough to shift its orbital track around the larger asteroid.

Cameras on the impactor and on a briefcase-sized mini-spacecraft released from DART about 10 days beforehand will record the collision and beam images back to Earth. Ground-based telescopes will measure how much the moonlet’s orbit around Didymos changes.

The DART team expects to shorten Dimorphos’ orbital track by 10 minutes but would consider at least 73 seconds a success. A small nudge to an asteroid millions of miles away would be sufficient to safely reroute it. DART is the latest of several NASA missions of recent years to explore and interact with asteroids, primordial rocky remnants from the solar system’s formation 4.6 billion years ago.

Last month, NASA launched a probe on a voyage to the Trojan asteroid clusters orbiting near Jupiter, while the grab-and-go spacecraft OSIRES-REx is on its way back to Earth with a sample collected last October from the asteroid Bennu.

The Dimorphos moonlet is one of the smallest astronomical objects to receive a permanent name and is one of 27,500 known near-Earth asteroids of all sizes tracked by NASA. Although none poses a foreseeable hazard to humankind, NASA estimates many more asteroids remain undetected in the near-Earth vicinity.

The DART spacecraft, cube-shaped with two rectangular solar arrays, is due to rendezvous with the Didymos-Dimorphos pair in late September 2022. NASA put the entire cost of the DART project at $330 million, well below that of many of the space agency’s most ambitious science missions.

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