[elihu]

It's probably more interesting to study the object itself.

I assume its orbital period is long enough that it won't be back near the central solar system for a very long time. But similar objects could have interesting uses.

One thought experiment is to consider what it would take to be able to live on such an object, perhaps even a rogue planet just floating between the stars.

It would be very cold. Presumably you'd be reliant on nuclear fission or fusion for power, so you'd need a significant fuel supply that could effectively last indefinitely. And you'd want to have a ready supply of all the basic elements you need. Which seems more realistic the bigger the object is. Like, an Earth or Mars-sized rogue planet might be ideal.