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.
Several prominent peaks of the mountain range are visible on the northern and eastern horizons [of Sultan, Washington], including Mount Pilchuck, Mount Index, Mount Persis, and Mount Stickney.