The near-Earth asteroid population from two decades of observations · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1604.06328/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTThe near-Earth asteroid population from two decades of observations — mentioned by ben_whttps://news.ycombinator.com/item?id=29030268urn:hackerpapers:mention:1604.06328:29030268Thu, 28 Oct 2021 19:11:31 GMT<p>Sideways motion is harder to determine than motion towards us; the former needs angular resolution, the latter doppler radar. And the sort of rock that could shift 67P from a safe to a dangerous path (LEO to 45 degrees one year ahead) would be about 13 metres radius. The Wikipedia citation is 5 years old, so I don’t know what we know today, but in 2016 the estimate was we only knew somewhere around 1.3% of asteroids between 40m and 3.5m diameter (and 0.003% of smaller than that, because things get harder to spot as you get smaller). Wiki…</p><p><a href="https://hackerpaper.kaipfister.de/p/1604.06328/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.EP