 Detailed follow-up observations on the ditimos dimorphos system measured the dimorphos orbit around ditimos at once every 11 hours and 22 minutes. That's a full 33 minutes shorter than its orbital period before the collision. This dramatic increase turns out to be caused by the production of at least a million kilograms of material ejected by the impact. That's just over 1,000 U.S. tons. In addition, Hubble has detected 37 boulders knocked off the asteroid by the force of the collision. The total mass of these boulders is about 0.1% of the mass of dimorphos. They are drifting away from the asteroid at around 1 kilometer per hour. That's 0.62 miles per hour. In 2024, the European Space Agency's HERA mission plans to launch a spacecraft to the system. It will perform a detailed post-impact survey that will turn the dart experiment into a well-understood and repeatable planetary defense technique that might one day be used for real. We'll see more on this in the 2024 review.