GJ 1128 is a star in the constellation Carina. It is somewhat nearby, located about 21.212 light-years away from Earth.

GJ 1128 is a red dwarf star with a mere 0.43% of the solar luminosity,^[6] and an estimated mass 17.5% of the mass of the Sun.^[5] It has 19% of the solar radius and its effective temperature is around 3,100 K, values comparable to the Barnard's Star.^[3] It is a long-term variable with the prominent 5-year starspot cycle comparable to that of Sun's.^[11]

The discovery designation of GJ 1128 is L 100-115,^[12] from a 1944 catalogue of high-proper-motion stars.^[13] It was then included in the 1979 Gliese–Jahreiss catalogue of nearby stars with an estimated parallax of 125 mas.^[14] The small distance from Sun to the GJ 1128 was confirmed by later direct measurements of its parallax.^[11]

See also

• List of star systems within 20–25 light-years

References