The Bayer designation Phi Hydrae (φ Hya / φ Hydrae) is shared by three star systems, in the constellation Hydra: φ1, 43 Hydrae φ2, 1 Crateris φ3, 2 Crateris The three stars form a triangle between the brighter μ Hydrae and ν Hydrae. Hydrae, Phi Hydra (constellation)