55 Cancri

55 Cancri is a binary star system located 41 light-years away from the Sun in the zodiac constellation of Cancer. It has the Bayer designation Rho Cancri (ρ Cancri); 55 Cancri is the Flamsteed designation (abbreviated 55 Cnc). The system consists of a K-type star (designated 55 Cancri A, also named Copernicus /koʊˈpɜːrnɪkəs/) and a smaller red dwarf (55 Cancri B).

As of 2025, four extrasolar planets, designated 55 Cancri Ab, Ac, Ae and Af, named Galileo, Brahe, Janssen, and Harriot, respectively, and two planet candidates 55 Cancri Ad (named Lipperhey) and 55 Cancri Ag are known to orbit 55 Cancri A; alongside two extrasolar planets, designated Bb and Bc, which are known to orbit 55 Cancri B.