DENIS-P J082303.1-491201 b

DENIS-P J082303.1-491201 b (alias 2MASS J08230313-4912012 b) is a substellar object, classified as either an exoplanet or a brown dwarf, orbiting DENIS-P J082303.1-491201, an L1.5-type brown dwarf in the constellation Vela. As of March 2014, DENIS-P J082303.1-491201 b, with a mass of nearly 29 MJ, is listed as the most massive exoplanet so far discovered.

Discovery
DENIS-P J082303.1-491201 b was discovered by Sahlmann et al. (2013) using the ESO telescopes at the La Silla Paranal Observatory. It is part of an ultracool binary system.

Physical
DENIS-P J082303.1-491201 b is located 20.77 parsecs (67.7 ly) from Earth. At 28.5±1.9 MJ, it is listed as the most massive planet in the NASA Exoplanet Archive, although, according to most definitions, this object is too massive to be a planet and is more properly classified as a brown dwarf.

Orbital
DENIS-P J082303.1-491201 b orbits the nearby L1.5-type brown dwarf DENIS-P J082303.1-491201, which is 7.5±0.7% the mass of our Sun, and has an orbital period of about 246 days.