Tau Ceti is the prime candidate among known star
s for having habitable planet
s, because of its observed dust disk
, and its similarity to our Sun
It's a type G8 star with a mass 90% of our Sun's, luminosity a bit less than a half ours, and at a distance of only 12 light years, it's reachable!
Tau Ceti is thus a popular destination in science fiction and RPGs, from Barbarella to Marathon.