SCR 1845−6357 is a binary system, 13.1 light-years (4.0 parsecs) away in the constellation Pavo.

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 2,400 K (2,100 °C; 3,900 °F).

[9] This star has been found to have a brown dwarf companion in 2006, designated SCR 1845-6357 B.

[10] The companion has an observed distance of 4.1 AU from the primary and is classified as a T-dwarf.

[3] It is estimated to have between 25 to 65 times the mass of Jupiter (2.4 to 6.2% of the Sun's mass), but its radius is 30% smaller than that of Jupiter, about 50,000 km (31,000 miles).