kengr

It was not deliberate. They made a seemingly normal jump to [somewhere] in the 47th century and arrived in the Sol system in the 17th century (or earlier)

Their records of things that far back are pretty slim in spite of having extensive historical databases (it was an exploration vessel, so they had that sort of thing for references when dealing with "lost colonies" and aliens)

I haven't decided yet if there's evidence that they aren't in their own past, for that matter.

They picked an isolated area away from "civilization" so they wouldn't be noticed coming and going (at least not by anybody who "counts" historically).

They also needed to be able to get in and out with "small" vehicles (your basic "flying car" and "flying large RV) with provisions to get the ship (Type S scout?) out if they *have* to (likely involving blowing open whatever they hid the entrance with)