ESA Operations's tweet - "Initial observations sometimes show the newly discovered #asteroid has a chance of impacting Earth, and in these cases researchers use their early orbit calculation to predict where their asteroid might have appeared in the past, in archival images sometimes decades old ..."

What's an asteroid "precovery"?☄️👻

Calculating an asteroid's orbit, and so the risk it poses to Earth, requires measuring its position on multiple occasions. For newly discovered asteroids, only a few days or weeks of data are available, so just a preliminary path can be traced pic.twitter.com/BFc6BdwWtc

ESA Operations

@esaoperations | 332,115 followers

Replying to @esaoperations

Initial observations sometimes show the newly discovered #asteroid has a chance of impacting Earth, and in these cases researchers use their early orbit calculation to predict where their asteroid might have appeared in the past, in archival images sometimes decades old ...

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