Eta Geminorum is a red giant, about 50 times the size of the Sun, at a distance of 280 light years. It is a visual binary and a variable (details below).
[3944] eta Geminorum is a triple star that also goes by the names Tejat Prior, Propus and Praepes.
[3946] delta Geminorum, a binary star, has the traditional name Wasat ("the middle").
PROPUS (Eta Geminorum). Gemini, the Twins, represented by Castor (Alpha Geminorum) and Pollux (Beta Gem) at its northern end, is anchored at the bottom by Alhena (Gamma) and at the southwest corner by a pair of similar stars, ...
Castor's pelvis is represented by the star epsilon Geminorum, Castor's left foot by nu Geminorum, and Castor's right foot by mu Geminorum and eta Geminorum: epsilon, mu, and eta Geminorum are of the third magnitude.
Reference
* H. A.
Tejat Prior Eta Geminorum
Thabit Upsilon Orionis
Theemin Upsilon-2 Eridani
Thuban Alpha Draconis
Tien Kuan Zeta Tauri
Toliman Alpha Centauri
Torcularis Septentrionalis Omicron Piscium
Tseen Kee Phi Velorum
Tureis Pi Puppis
Tyl Epsilon Draconis ...
Unlike the twins that they represent, the stars Castor and Pollux are not related since they lie at different distances from us. Eta Geminorum is called Propus, meaning ‘forward foot' in Greek, a name that first appears with Eratosthenes.
 See also: Castor, Sky, Pollux, Distance, Night
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