DENIS J081730.0−615520 (also known as 2MASS 08173001−6155158) is a T-type brown dwarf 17 light-years (5.2 parsecs) away in the constellation Carina.

It was discovered by Etienne Artigau and his colleagues in April 2010.

[failed verification] DENIS J081730.0-615520 is the fourth-nearest isolated T dwarf to the Sun (after UGPS J0722−0540, WISE 1741+2553, and WISE 1506+7027) and the eighth-nearest (also after Luhman 16B, ε Indi Bab and SCR 1845-6357B) if one takes into account T dwarfs in multiple star systems.

[8] 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.

Other molecules detected in the atmosphere of this brown dwarf are methane (CH4), water vapor (H2O), carbon monoxide (CO) and ammonia (NH3).