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NASA’s DART spacecraft collides with an asteroid in the world’s first planetary defence test

by TLAteam September 27, 2022September 27, 2022
written by TLAteam September 27, 2022September 27, 2022
NASA’s DART spacecraft collides with an asteroid in the world’s first planetary defence test

NASA’s Double Asteroid Redirection Test (DART) spacecraft made history by colliding with an asteroid, completing the world’s first planetary defence test.

DART successfully collided with asteroid Dimorphos at around 4:44 am IST on Tuesday, September 27. The spacecraft’s DRACO (Didymos Reconnaissance and Asteroid Camera for optical navigation) instrument captured images of Dimorphos as DART approached the asteroid. Moments before the crash, DRACO imaged the rocky terrain of Dimorphos, which is a football-sized asteroid.

Dimorphos, which is a part of a binary, near-Earth asteroid system called Didymos, posed no threat to Earth. DART demonstrated a first-of-its-kind planetary defence technique by deflecting Dimorphos. This is the world’s first mission to test technology for defending Earth against potential asteroid or comet hazards.

Before DART’s impact with Dimorphos, the asteroid orbited Didymos, the other asteroid in the binary system. Didymos has a diameter of around 780 metres, and is located at a distance of 487,446,221 kilometres from Earth. Smaller in size, Dimorphos had a diameter of around 160 metres. This binary asteroid system Didymos was DART’s target.

Though Dimorphos posed no threat to Earth, DART was made to collide with it to change the asteroid’s speed and path, as a test of NASA’s ability to achieve a kinetic impact on an asteroid and observe its response.

NASA selected Dimorphos because it did not pose any threat to Earth, and hence, served as the perfect testing ground to see if the intentional crash of a spacecraft into an asteroid is effective in changing its speed and direction.

The results of DART’s kinetic impact with Dimorphos will be analysed by the DART Investigation Team. The team will use telescopes on Earth to study how much the spacecraft’s impact changed the asteroid’s motion in space.

DART was launched on November 24, at 1:20 am EST (November 24, at 10:50 am IST) aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base.

If the DART mission is successful, it will provide critical data to help Earth better prepare for an asteroid that may pose a threat to the planet in the future.

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