Mu2 Octantis

Mu2 Octantis (μ2 Oct) is a binary star system of two G-type main-sequence stars. It shares the designation μ with μ1 Octantis, from which it is separated by 50 arcminutes.

Mu2 Octantis has a 29% higher mass than the sun, and is slightly hotter. Its radius is 73% more than the Sun's and it is nearly four times as luminous.

This star is a member of a wider binary star system. The two components are gravitationally bound and separated at $-10.9$ in our sky, corresponding to 740 astronomical units (AU). The semimajor axis of the stars' orbit is 932 AU. The companion star is HD 196068, another G-type main-sequence star with an apparent magnitude of 7.18.

Planetary system
From 1998 to 2012, the system was observed using the CORALIE instrument, at the ESO's La Silla Observatory.

In November 2012, a long-period, wide-orbiting planet was deduced by radial velocity around HD 196067. The planet has been pulled to an eccentric orbit by the B star HD 196068. The planet's true mass, as measured by astrometry, is, placing it right on the boundary between planets and brown dwarfs.