Viewing a single comment thread. View all comments

BartyDeCanter t1_itney45 wrote

Reply to comment by HardShelledTurt in Deflecting asteroids is not enough — we need to know when they approach by burtzev

That is, of course, an excellent point. What we do have is estimates from a few different methods (mass distribution, perturbation analysis, discovery curve, etc) and they are converging on <1000 NEOs larger than 1km. Here's a nice, though slightly outdated, graphic: https://www.nasa.gov/mission_pages/WISE/multimedia/gallery/neowise/pia14734.html

And a recent paper giving an estimate of 940+-10. https://www.sciencedirect.com/science/article/abs/pii/S0019103521001342

&#x200B;

Edit: Article link

12