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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HD 155358 is a low metallicity yellow dwarf star approximately 43 light years away in the constellation Hercules. This star is known to be orbited by two extrasolar planets. The star is 11.9 billion years old and has a mass 0.89 times that of the Sun. It is notable for being the lowest metallicity planet-bearing star known, with an iron-to-hydrogen ratio 21% of the solar value. With a visual magnitude of 7.5, this star can not be observed with the unaided eye. Hence it was discovered only after the introduction of the telescope. In 1859 it was catalogued in the Bonner Durchmusterung by the Prussian astronomer F. W. Argelander, who listed an estimated visual magnitude of 7.2.