[14] Consequently, Delta Geminorum itself is known as 天樽二 (Tiān Zūn èr, English: the Second Star of Celestial Wine Cup.).

[citation needed] In 1930, the dwarf planet Pluto was discovered about 0.5° to the east of this star by American astronomer Clyde Tombaugh.

The inner components form a spectroscopic binary with a period of 6.1 years (2,238.7 days) and an orbital eccentricity of 0.3530.

A cooler class K companion is not apparent to the naked eye but clearly visible in a small telescope.

In about 1.1 million years, it will make its closest approach at a separation of roughly 6.7 ly (2.1 pc).