Mu Leonis

Based upon an annual parallax shift of 0.02628 arc seconds as measured by the Hipparcos satellite,[1] this system is 124 light-years (38.1 parsecs) from the Sun.

[11] Mu Leonis is an evolved K-type red giant star with a stellar classification of K2 IIIb CN1 Ca1.

[3] The trailing notation indicates that, for a star of its type, it has stronger than normal absorption lines of cyanogen and calcium in its spectrum.

This planet was detected by measuring radial velocity variations caused by gravitational displacement from the orbiting body.

[7] Later in 2024, a study using astrometry from the Gaia spacecraft find a mass of 12.6 MJ, which the authors interpret as a likely upper limit, as the large level of RUWE in the astrometric solution—which could be caused by a companion around the star—might be just the result of systematic calibration errors.