[BurningFrog]

Seems like a bigger problem for turtles than for asteroids.

I mean, asteroids don't deliberately hide.

Sure, some are darker and/or have a less visible radar profile or whatever, but the variations seem manageable.

[craftyguy]

They don't deliberately hide, but (as mentioned in the article) they can vary dramatically in how visible they are to us over time if, for example, they have a highly eccentric orbit.