Scientists overjoyed after DART smashes into asteroid Dimorphos, contact lost
- Reference: 1664243169
- News link: https://www.theregister.co.uk/2022/09/27/dart_nasa_asteroid_oimpace/
- Source link:
The Double Asteroid Redirection Test ( [1]DART ) spacecraft, with a mass of 570 kilograms before impact, fired up its hydrazine thrusters and slammed into the space rock at a speed of 6.4 km per second around 2314 UTC on Monday.
Scientists at mission control and netizens around the world watched in anticipation as the egg-shaped Dimorphos slowly came into view during a [2]livestream of DART's camera. The asteroid appeared as a small dot that got larger overtime as DART approached the space rock. At first, only Dimorphos' larger companion asteroid Didymos was visible as the spacecraft guided itself to the binary asteroid system.
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But as the DART craft closed in on Dimorphos, Didymos disappeared from view and Dimorphos' grainy surface features became visible. The camera stream continued until impact destroyed the hero probe.
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Here's an animated recap of the crash:
Don't want to miss a thing? Watch the final moments from the [6]#DARTMission on its collision course with asteroid Dimporphos. [7]pic.twitter.com/2qbVMnqQrD — NASA (@NASA) [8]September 26, 2022
The group of engineers and scientists from NASA and Johns Hopkins University's Applied Physics Laboratory whooped and clapped as they confirmed a loss of communication with DART. "We have impact," they confirmed just moments after. And there was much rejoicing.
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Sequence of images from DART DRACO camera, from left to right, 20 seconds from impact to moments before crashing into Dimorphos ... Click to enlarge. Source: Livestream
The historic achievement marks the first time humanity has – hopefully – moved an asteroid in space. If the team's calculations are correct, the kinetic energy imparted from the collision nudged Dimorphos closer to Didymos. This was a test to see if we can hit and shift a future asteroid, such as one imperiling our fragile planet.
Dimorphos is a moonlet of Didymos, and orbits the larger rock, while both orbit the Sun. The collision is expected to cut the time it takes for Dimorphos to orbit around Didymos by ten minutes.
The binary system doesn't pose a danger to Earth, and was chosen as target practice. The cosmic prang's effects – altering Dimorphos's path of travel – will be observed, measured, and verified using readings from ground-based telescopes on Earth.
[10]This hero probe will smash into an asteroid to see if we can deflect future killer rocks
[11]NASA boffins seem to think we're worth saving from fiery asteroid death so they're shooting a spaceship at one
[12]Research into deflecting potentially world-destroying asteroids is apparently not a 'national priority' for the UK
[13]Euro space boffins hatch comms satellite hijack plan to save Earth from extinction
The DART craft was launched from Earth on November 24, 2021 from the Vandenberg Space Force Base in California atop a SpaceX Falcon 9 rocket. It spent about ten months orbiting the Sun waiting for the right moment for the closest approach with the binary asteroid system. Although the DART mission is over, the experiment continues. A smaller dual-camera cubesat, LICIACube, was launched along with the main DART probe and will now observe the aftermath of the collision.
The European Space Agency is also going to fly out another spacecraft, Hera, to study and measure the details of the smash. The data gathered on both the asteroid's shape, and composition, will help confirm whether the models simulating the DART collision were accurate or not; it's crucial to check whether such an experiment can be refined and repeated, especially if a similar maneuver is to be carried out against a real threat.
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Located 6.8 million miles away at impact, just beyond the orbit of Mars, Didymos and Dimorphos won't ever hit our home world, but space rocks closer to our planet, classified as near-Earth objects, are more risky. Astronomers have discovered nearly 30,000 of these objects to date, and continue to find thousands more every year," [15]according to NASA.
The American space agency's Administrator Bill Nelson congratulated the team in a pre-recorded [16]message : "It's been a successful completion of the first part of the world's first planetary defense test. And there were years of hard work. There was a lot of innovation and creativity that went into this mission.
"And I believe it's going to teach us how one day to protect our own planet from an incoming asteroid. I really look forward to learning all about what's happening from the observatories, so they can tell us about the changes in this asteroid's orbit.
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"So thank you to this international team. We are showing that planetary defense is a global endeavor, and it is very possible to save our planet." ®
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[1] https://www.theregister.com/2022/09/24/dart_spacecraft_asteroid_nasa/
[2] https://www.youtube.com/watch?v=-6Z1E0mW2ag
[3] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=2&c=2YzJ1XMYZdf8Rislwh2RhzgAAAE8&t=ct%3Dns%26unitnum%3D2%26raptor%3Dcondor%26pos%3Dtop%26test%3D0
[4] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44YzJ1XMYZdf8Rislwh2RhzgAAAE8&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
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[6] https://twitter.com/hashtag/DARTMission?src=hash&ref_src=twsrc%5Etfw
[7] https://t.co/2qbVMnqQrD
[8] https://twitter.com/NASA/status/1574546758822084608?ref_src=twsrc%5Etfw
[9] https://regmedia.co.uk/2022/09/27/handout_nasa_dart_impact.jpg
[10] https://www.theregister.com/2022/09/24/dart_spacecraft_asteroid_nasa/
[11] https://www.theregister.com/2021/11/24/double_asteroid_redirection_test/
[12] https://www.theregister.com/2020/09/16/esa_hera_contract/
[13] https://www.theregister.com/2021/07/13/airbus_commsat_crashing_plan/
[14] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=4&c=44YzJ1XMYZdf8Rislwh2RhzgAAAE8&t=ct%3Dns%26unitnum%3D4%26raptor%3Dfalcon%26pos%3Dmid%26test%3D0
[15] https://www.nasa.gov/planetarydefense/faq
[16] https://twitter.com/SenBillNelson/status/1574539944827183104
[17] https://pubads.g.doubleclick.net/gampad/jump?co=1&iu=/6978/reg_offbeat/science&sz=300x50%7C300x100%7C300x250%7C300x251%7C300x252%7C300x600%7C300x601&tile=3&c=33YzJ1XMYZdf8Rislwh2RhzgAAAE8&t=ct%3Dns%26unitnum%3D3%26raptor%3Deagle%26pos%3Dmid%26test%3D0
[18] https://whitepapers.theregister.com/
There's no altered path - they hit a 'moon'
This binary 'system' of asteroids was chosen particularly because that's not an issue. Who knows what will happen in billions of years (butterfly effect) but for now it's just as likely to make it more likely to not hit Earth as to make it hit Earth (effectively zero for both).
First, Didymos and Dimorphos are on a 2.1 year orbit around the sun with minimal interactions. They come nowhere near Earth (10.6M km at the closest).
The second key here is that Dimorphos orbits Didymos with a period of about 12 hours. What they did is hit Dimorphos head on with the force of about 3-4 kilotons of TNT. This will make Dimorphos slow down slightly so it takes a few more minutes to orbit, which will cause it to orbit slightly closer to Didymos (by the rules of orbital dynamics, slower = closer). That's it! The total mass of the two is unchanged except for the negligible size of the DART probe, which may be made up for by the ejecta. Didymos will continue to orbit the sun just as before.
Understanding this is crucial to why they chose this pair as posing no danger.
Take only photos, leave only footprints
!!!BLAM!!!
sorry
Should have flung a sheep
Little disappointed at the lack of standardised units Reg’o (Aussie, Aussie, Aussie)
Seems the little bugger was only travelling at 0.2135% of the maximum velocity of a sheep in a vacuum.
https://www.youtube.com/watch?v=5k3UPct2cqI
170!
I'm impressed by the aim and I had a 170 finish at darts when I was 12. If you don't know darts that is like a hole in one in golf, or England beating Germany in football.
There goes the prime directive... Murica Successfully Saves the world AGAIN with a bomb
Something there is that doesn't love a bomb. Aside from the Murican Celebrations, this bloody asteroid didn't move a millimetre, do the math. Not that, that matters. Awards and prizes will still be given out, the Space Farce will be declared a fundable success. The story will grow over time as to how Murica saved Europe once again. Of course, Europeans will be allowed to participate in future experiments, through their generous contributions.
Why not celebrate with a big Bill "Deliverance Kid" Nelson smile, as blowing up celestial objects, or attempting to do so, is not only acceptable but will save mankind from the next earth extinction... Isn't the solar system lucky today....? Man and his bombs will be around for another 450 million years... I hope all you European junior scientists know which nation buttered your bloody bread today.
Re: There goes the prime directive... Murica Successfully Saves the world AGAIN with a bomb
Keep taking the dried frog pills.
Megalomaniac Plan
When I was six, my father explained the duality of light to me. That night I took a flashlight out into our back yard and gleefully shot it at the Moon. Since light was, in some sense, particles, I was pushing the Moon out of its orbit! (Though by just a picoscopic amount.) Muu-ha-ha-ha-ha-haaaah!
If it actually did alter its path, one has to then wonder if that new path might somehow alter the path of another object which then might alter another object which somewhere down the line would cause a major impact with Earth. Sometimes, leaving things alone, is the smart move.