Tags: Star.
HD 17156 is a yellow subgiant star approximately 240 light-years away in the constellation of Cassiopeia. The apparent magnitude is 8.17 which means it is not visible to the naked eye but can be seen with good binoculars. A search for a binary companion star using adaptive optics at the MMT Observatory was negative.The star is more massive and larger than our Sun while Its absolute magnitude of 3.70 and spectral type of G0 show that it is both hotter and more luminous.