In reply to @esaoperations
... these past images are searched to see if the 'new' asteroid has in fact been lurking. If they spot it, researchers can extend the 'arc of observation' back through time and space, to project forwards a very precise path for the object.
@esaoperations | 332,082 followers
Replying to @esaoperations
Many asteroids have been removed from ESA's #AsteroidRiskList like this: looking for signs of seemingly new asteroids lurking in old observations, to better understand their future #PlanetaryDefence

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