Rho Geminorum (ρ Gem) is a star system that lies 59 light-years away in the constellation of Gemini, about 5 degrees west of Castor.

Rho Geminorum A has a spectral type F0V, meaning that it is a main sequence that is over a thousand kelvins hotter, one-third more massive, two-thirds larger and five-and-a-half times more luminous than the Sun.

[14] Peculiarly, the five observations recorded in the WDS date between 1910 and 1935 and none have been made since; even in literature, more recent attempts to resolve Rho Geminorum B have been unsuccessful.

The position of this star relative to the primary has remained consistent over decades, indicating that it has a common proper motion and is therefore a wide tertiary component.

While the derived age for Rho Geminorum A of 2.1 billion years is not particularly young, component E is still very active: It has an S'HK of about 0.5,[17] a value similar to that of the near-analogous Epsilon Eridani whose Log R'HK is -4.45.