GJ 3305 is a binary star system in the constellation of Eridanus, notable for being bound to 51 Eridani, an exoplanet-hosting F-type main-sequence star. Based on parallax measurements, it is located at a distance of .
Characteristics The two components of GJ 3305 are red dwarfs with a combined spectral type of M1.1V. They orbit around each other with a period of 29.4 years, following a slightly eccentric orbit with and a semi-major axis of . The orbit is seen nearly edge-on, with an inclination of . The primary, , has a mass of , while the secondary, , has a mass of . Both components are young, estimated to be between 20 and 30 million years old.
GJ 3305 was first noted as a physical companion to 51 Eridani in 2006. The two systems are separated by 66", yielding a projected separation of .
See also 51 Eridani b
References