Which star system is the Hail Mary crew traveling toward?

The Hail Mary crew is traveling toward the Tau Ceti star system.

Tau Ceti is a real, Sun-like star located just under 12 light-years from Earth in the constellation Cetus. In Project Hail Mary, it appears to be the only nearby star not suffering the catastrophic dimming affecting the Sun and many other stars. That apparent immunity makes it the destination for the international rescue mission.

The question asks for the star system, not a planet. Tau Ceti is the star’s name; Tau Ceti e is a fictional planet orbiting it and later receives the informal name Adrian. Alpha Centauri and Proxima Centauri are real nearby stellar destinations, but they are not the target of the Hail Mary.

Tau Ceti’s real astronomical identity gives the novel and film a scientific anchor. Although the story invents the astrophage crisis and the mission’s events, Tau Ceti itself is a genuine G8 main-sequence star often discussed in connection with searches for exoplanets and extraterrestrial life.