Eta Cassiopeiae

Eta Cassiopeiae is a binary system located 19.4 light years from Sol, located of course in good old, recognizable, W-shaped Cassiopeia.  Star A is a yellow G0V dwarf, very close to Sol in terms of spectral class and probably age as well (estimates range from 3 to 6 billion years).  On the other hand, metallicity is only around 65%.  Star B is a K7V orange dwarf.  The two stars don’t come any closer to each other than 36 AU in their mutual orbit.  This system is a very promising candidate to have a world we could live on.