Eta Geminorum (η Geminorum, abbreviated Eta Gem, η Gem), formally named Propus /ˈproʊpəs/, is a triple star system in the constellation of Gemini. It is a naked-eye variable star around 380 light years from the Sun.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/astronomy/stars/propus/en.wikipedia.org.md