Mu2 Octantis
Mu2 Octantis is a binary star system in the constellation Octans, whose primary and secondary stars have apparent magnitudes of +6.481 and 7.153, respectively. Based on parallax measurements, it lies 130.3 light-years away.
The two stars, HD 196067 and HD 196068, are separated at in the sky, corresponding to 740 astronomical units. The semimajor axis of the stars' orbit is 932 AU.
Component A is a G-dwarf star with 1.33 and 1.73 times of the Sun's mass and radius, respectively. Component B also a G-type main-sequence star with a radius 1.19 times larger than the Sun. Their effective temperatures are similar. HD 196068 has a higher metallicity than its companion, the reasons for this are uncertain.
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 traditionally adopted boundary between planets and brown dwarfs.
A second, innermost planet was detected using radial velocity observations with the CORALIE, HARPS, and ESPRESSO observatories. Despite its small orbit, it does not transit the host star.