HD 131664 is an 8th magnitude star in the southern constellation of Apus with an orbiting brown dwarf or stellar companion.
Parallax measurements by the Gaia space observatory provide an estimated distance of 172.5 light years from the Earth.
It is radiating 160%[2] of the Sun's luminosity from its photosphere at an effective temperature of 5,901 K.[6] The discovery of a brown dwarf in orbit around HD 131664 was announced on October 26, 2008 and designated HD 131664 b.
[10] The object was detected from Doppler measurements of the host star between 2004 and 2008.
[4] Follow-up studies with data from the Hipparcos and Gaia satellites further constrained the predicted mass of the companion, providing a best estimate of 127.8±17.9 MJ, or about 0.12 times the mass of the Sun.