SCR 1845−6357

SCR 1845−6357 is a binary system, away in the constellation Pavo. The primary is a low-mass red dwarf and the secondary is a brown dwarf. It is one of the nearest stellar systems, as well as the closest red dwarf-brown dwarf binary.

System

The primary, SCR 1845−6357A, is an ultra-cool red dwarf, one of the smallest and coolest stars so far discovered, with a mass of about 7% of the Sun's, a radius 9.4% of the Sun's, and an effective temperature of. It is very faint, at an apparent magnitude of 17.4 due to its low luminosity, equivalent to 0.03% of the Sun's luminosity across all wavelengths. It was discovered in 2004 by the SuperCOSMOS survey.
This star has been found to have a brown dwarf companion in 2006, designated. The companion has an observed distance of 4.1 AU from the primary and is classified as a T-dwarf. It is estimated to have 25 to 65 times the mass of Jupiter, but its radius is 30% smaller than that of Jupiter, about 50,000 km. It has an effective temperature around.