Its main star, Mu Herculis A is fairly similar to the Sun although more highly evolved with a stellar classification of G5 IV.

[20] Consequently, the Chinese name for μ Herculis itself is 天市左垣三 (Tiān Shì Zuǒ Yuán sān, English: the Third Star of Left Wall of Heavenly Market Enclosure), represent Jiuhe (九河, lit.

The brightest star is a well-studied G-type subgiant, whose parameters are precisely determined from asteroseismology.

[8] It was believed to be a close binary with a low-mass stellar or a large substellar companion.

The secondary component, also known as Mu2 Herculis,[12] consists of a pair of stars that orbit about each other with a period of about 43 years.