HD 17156, named Nushagak by the IAU,[7] is a yellow subgiant star approximately 255 light-years away in the constellation of Cassiopeia.
[8] The star is more massive and larger than the Sun while Its absolute magnitude of 3.70 and spectral type of G0, show that it is both hotter and more luminous.
Based on asteroseismic density constraints and stellar isochrones, it was found that the age is 3.37 +0.20−0.47 billion years making it about two thirds as old as the Sun.
[3][5] An extrasolar planet, HD 17156 b, was discovered with the radial velocity method in 2007, and subsequently was observed to transit the star.
[3][9] The star was given the name Nushagak by the IAU, chosen by United States representatives for the NameExoWorlds content, with the comment that "Nushagak is a regional river near Dilingham, Alaska, which is famous for its wild salmon that sustain local Indigenous communities.