Could be, but its orbit means limited time frame and missions that you have only one chance per save and it will depend how close it is to its Periapsis once you've started a new save. In short, you will only have a single window for an encounter per game*. You don't want to waste that by just sending a simple unmanned probe/lander assembly, right? So you then start building your massive interplanetary ship for this one-off encounter. But if you miscalculated and saw that the body was still a couple of thousand years away, are you willing to timewarp (given that it would still take a couple of hours at maximum warp**) until a transfer window arrives? If you don't care about not launching a space vehicle or a new mission for a few in-game millenia, METs of your active missions getting stamped with T+9999 (even your "Sedna" ship will get it if it's already built) and leaving a kerbal inside a ship in orbit for more than a thousand years*** (TL;DR: throwing your space program out of whack) then that would be fine for you to warp-it-up. *unless the warpmatics option is used. **current (0.20) timewarp scaling. ***assuming that life support isn't implemented yet in-game, and the kerbals still rely on "photosynthesis" by the time a planetoid with "that" orbit gets introduced.