Aliens any day now

I'm not sure how accurate this estimate could be, given that this is the first interstellar asteroid/alien star destroyer detected swanning through the solar system, but The Guardian reports:

The other group of astronomers, led by David Jewitt, University of California Los Angeles, estimated how many other interstellar visitors like it there might be in our solar system.

The other group of astronomers, led by David Jewitt, University of California Los Angeles, estimated how many other interstellar visitors like it there might be in our solar system.Surprisingly, they calculate that another 10,000 could be closer to the sun than the eighth planet, Neptune, which lies 30 times further from the sun than the Earth. Yet these are currently undetected.

Each of these interstellar interlopers would be just passing through. They are travelling too fast to be captured by the gravity of the sun. Yet it still takes them about a decade to cross our solar system and disappear back into interstellar space.

If this estimate is correct, then roughly 1,000 enter and another 1,000 leave every year – which means that roughly three arrive and three leave every day.

Presumably, this means that, despite decades of attempts to detect asteroids around the solar system, we could find that on any day of the week one that comes from interstellar space does a braking burn and our alien overlords will have arrived.