Gliese 454/HD 104304

A K0IV star in Virgo, 42 light years away, metallicity about one and a half times that of Sol.  Between 5 and 6 billion years old.  Has a companion about 20 times the size of Jupiter.

Here is an interesting look at IV subgiants (among others) as possible suns for habitable worlds:http://www.centauri-dreams.org/?p=4886