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" ... Asteroid Apophis has been measured many times over the timespan of multiple years quite precisely, ... [+] leading scientists to determine its orbit to a remarkable precision. Of course, additional effects, such as offgassing or gravitational encounters, have the potential to alter that orbit beyond mere Keplerian effects. ... "
" ... In all known cases, meteor showers arise from a parent body, like a comet or asteroid that’s passed close to the Sun and has heated up to the point where it’s produced tiny particles from a combination of offgassing, tidal forces tearing it apart, and solar wind and radiation striking these loosely-held surface particles. These tiny particles are known as a debris stream, and they get stretched out across the comet’s (or asteroid’s) orbit. Whenever planet Earth itself plows through that debris stream, these particles strike Earth at a tremendous speed — dozens or even close to a hundred km/s — creating the spectacular display known as a meteor shower. ... "
" ... The ESA's Rosetta mission had a close encounter with Comet 67P/Churyumov-Gerasimenko, imaging its ... [+] offgassing of volatiles up close for an extended period of time. ... "