Guardians of the Stars
DENIS J081730.0-615520 (also known as 2MASS 08173001-6155158) is a T brown dwarf about 5 pc (16 light years) away in the constellation Carina. It was discovered by Etienne Artigau and his colleagues in April 2010. The star belongs to the T6 spectral class implying a photosphere temperature of about 950 K. It has a mass of about 15 MJ (Jupiter masses) or about 1.5% the mass of the Sun.
DENIS J081730.0-615520 is the second nearest isolated T dwarf to the Sun (after UGPS J0722-05) and the fifth nearest (also after ε Indi Bab and SCR 1845-6357B) if one takes into account T dwarfs in multiple star systems. It is also the brightest T dwarf in the sky (in the J-band); it had been missed before due to its proximity to the galactic plane.