GJ 1128

GJ 1128 is a star in the constellation Carina. It is somewhat nearby, located about away from Earth.
GJ 1128 is a red dwarf star with a mere 0.43% of the solar luminosity, and an estimated mass 17.5% of the mass of the Sun. It has 19% of the solar radius and its effective temperature is around 3,100 K, values comparable to the Barnard's Star. It is a long-term variable with the prominent 5-year starspot cycle comparable to that of Sun's.
The discovery designation of GJ 1128 is L 100-115, from a 1944 catalogue of high-proper-motion stars. It was then included in the 1979 Gliese–Jahreiss catalogue of nearby stars with an estimated parallax of. The small distance from Sun to the GJ 1128 was confirmed by later direct measurements of its parallax.