Astronomy and Space

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 Rho1 Cancri (ρ1 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 ) and a smaller red dwarf (55 Cancri B). As of 2025, five extrasolar planets, designated 55 Cancri Ab, Ac, Ae, Af, and Ad, named Galileo, Brahe, Janssen, Harriot and Lipperhey, respectively, and one planet candidate, 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.

Also on this shelf

See also

• ▸Delta (rocket family)
• ▸John Ruskin (Millais)
• ▸Alfvén surface

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