[8] The star is somewhat over-luminous for its class,[7] radiating 2.33[2] times the Sun's luminosity from its photosphere at an effective temperature of 5,876 K.[3] In 2001, a brown dwarf candidate companion was announced by Anglo-Australian Planet Search program.
[9] This is a suspected common proper motion companion with 52% of the Sun's mass[10] and a physical separation of as much as 1,090 AU.
[7] HD 164427 b was initially thought to be a brown dwarf based on its minimum mass of 46 times that of Jupiter.
[7] In 2023, an astrometric orbit for this object was published using data from Gaia, showing its true mass to be 0.34 M☉, making it a likely red dwarf star.
It has a very high semi-amplitude of almost 1400 m/s, because this is a very massive object which exerts strong gravitational pull on its tugging star.