HD 187123 is a single,[7] yellow-hued star with two exoplanetary companions in the northern constellation of Cygnus.

The system is located at a distance of 150 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −17 km/s.

[3] The physical properties of this star are sufficiently similar to the Sun that it has been considered a solar analog, although the metallicity is higher.

It is radiating 1.44 times the luminosity of the Sun from its photosphere at an effective temperature of 5,853 K.[4] In 1998 the California and Carnegie Planet Search team, after following a suggestion by Kevin Apps, a Briton who at the time was an undergraduate student[9] found a possible planet orbiting the star.

[10] There were also indications of another, more distant body orbiting the star and this claim was published in 2006.