45,000 is close to 56,000, as compared to 4,600 or 460,000, or even 4,600,000, which are each an order of magnitude or more different. In your original post you suggested they might be off by one or two zeroes.
If you have a better number for the speed of asteroids, please share your expertise with us.
You are not reading critically. I did not post 45,000 nor did the article. The amount given in the article was 45,0000. They are off by one zero, and 45,0000 is a nonsensical number, especially for a scientific report.