DART Mission Plaudits and Review
upstart writes:
NASA's DART mission was a smashing success:
The Double Asteroid Redirection Test ended last year with the spacecraft colliding with an asteroid known as Dimorphos. NASA announced in the following weeks that DART had altered the asteroid's trajectory, and now we have four peer-reviewed papers that explore just how successful the mission was. The news is good - NASA has confirmed that DART validates kinetic impact as a viable way to deflect dangerous asteroids.
[...] Scientists are working to reconstruct the impact to evaluate DART's autonomous targeting ability. The authors of this study concluded that a DART-like mission to redirect a dangerous asteroid could theoretically do so without an advanced reconnaissance flight. [...]
Another of the four studies confirmed via two different measurement techniques that Dimorphos' orbit shifted by 33 minutes. NASA had expected the impact to push the asteroid by at least seven minutes, but the recoil effect of ejecta blasted off the surface had a greater effect than predicted. [...]
A separate study looked at the momentum transfer from the impact. The researchers found that DART instantly altered Dimorphos' orbit, slowing it by 2.7 millimeters per second. [...] The final study discusses what we can learn from DART beyond the planetary defense angle. Dimorphos it's now an "active asteroid" surrounded by a cloud of dust. The authors say analysis of this comet-like tail could help us learn more about the natural processes at work on asteroids.
Luckily, there are no known asteroid threats for at least the next century, but our catalog of near-Earth objects is incomplete. We could discover an asteroid with a high chance of impact tomorrow. It's happened before, and it'll happen again. For decades, kinetic redirection was seen as a potential way to save Earth from those rare but inevitable events, but no one knew if it would work. Now we do - humanity has the tools to prevent at least one kind of doomsday.
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