Astronomy and Space

51 Eridani

51 Eridani is a star in the constellation Eridanus. It has an apparent magnitude of 5.22, meaning it is just visible to the unaided eye in suburban and rural skies. The primary star's absolute magnitude is 2.87. There is also a binary star named GJ 3305 which shares the same proper motion through space with it, making it overall a triple star system. The primary star is significant as the host to one of the first planets to have been directly imaged in a wide orbit, and the first detected by the Gemini Planet Imager.

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See also

• ▸Heliophysics Science Division
• ▸Coptos Decrees
• ▸Comet Encke

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