If a space ship entered Earth orbit, how likely is it to be seen?

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Mostly what it says on the tin. If a spaceship, let's say about 200 meters long and 100 meters wide (made of modern materials) was approaching Earth and slowing down (say from 100 km/s to 3km/s), how far out would it be noticed? How clear of a picture could something take of it? Is is possible it wouldn't be seen until it reached the atmosphere?

The ship in question is not announcing its presence, but it also isn't trying to hide (and has no means of stealth), so it can probably be treated similarly to an asteroid.

posted over 4 years ago

Aetherfox‭

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If a space ship entered Earth orbit, how likely is it to be seen?

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