Groombridge 34 (SAO 36248)
m = 8.31 / 11.36; sep. = 34.1"; distance 11.61 light-years; photo (single frame) taken on 12/06/2019 with 140/980 mm SD Doublet Refractor, ISO 6400, 1 second exposure time
With a distance of only 11.61 light-years, the two red dwarfs of the binary Groombridge 34 (GRB 34, located near 26 Andromedae) are among the nearest stars to the Solar System. GRB 34 A, the brightest star in the picture, is a main sequence red dwarf of spectral type M1.4V with a mass of 0.38 and a luminosity of 0.005 times of that of the Sun. The faint GRB 34 B is of spectral type M3.5V. Its mass is 0.19 and its luminosity is only 0.0003 times of that of the Sun. GRB A and B orbit their common center of mass once every 1200 years. The current linear separation of the red dwarfs is 146 AU (about 5 times the distance of the planet Neptune from the Sun). In August 2014, the discovery of a planet orbiting around GRB 34 A - discovered using the radial velocity method - was announced. The white-blue star (in the picture to the right of GRB 34 A) is not a physical member of the system.