Luyten's Star /ˈlaɪtənz/[citation needed] (GJ 273) is a red dwarf in the constellation Canis Minor located at a distance of 12.35 light-years (3.79 parsecs) from the Sun.

It is named after Willem Jacob Luyten, who, in collaboration with Edwin G. Ebbighausen, first determined its high proper motion in 1935.

[11] It has a stellar classification of M3.5V,[3] with the V luminosity class indicating this is a main-sequence star that is generating energy through the thermonuclear fusion of hydrogen at its core.

[19] If all four planets are present, their true masses must be close to their minimum masses for the system to be stable, with upper limits of 3.03 M🜨 for b, 1.24 M🜨 for c, 11.35 M🜨 for d, and 9.70 M🜨 for e.[4] In October 2017, "Sónar Calling GJ273b", a project by METI and the Sónar music festival in Barcelona, Spain[20] transmitted a series of radio signals towards Luyten's star from a radar antenna at Ramfjordmoen, Norway.

[21] The signal consisted of a scientific and mathematical tutorial on how to decode the messages and was accompanied by 33 encoded musical compositions by various musicians.