hip-90289

Its story

21 Sagittarii is a pair of bright K2 giants some 410 light-years away, set against the dense skies of the Archer. The system's estimated mass is around eight times the Sun's, and both components drift gently toward us at roughly twelve kilometres per second. Beyond astronomy, the BBC turned it into the setting of its 2022 docu-drama «First Contact: An Alien Encounter», imagining an extraterrestrial artefact arriving precisely from here.