UGPS J072227.51−054031.2

UGPS J072227.51−054031.2 is a sub-brown dwarf or rogue planet of late T type, located approximately from Earth. It is the second closest known object of this type, after WISE 0855-0714.
The object is roughly the volume of Jupiter, but is estimated to have 3–11 Jupiter masses. This would make it less massive than ε Indi Ba. As objects of this type below 13 Jupiter masses are thought to be more likely to be planets than Brown Dwarfs, it would either be classified as a planet or a sub-brown dwarf, depending on how it formed and the definition used. Infrared spectra shows the object contains water vapor and methane and has a surface temperature of approximately 480–560 kelvins.

History of observations

UGPS 0722-05 was discovered by Philip Lucas at the University of Hertfordshire and announced in 2010. The discovery image was taken on 28 November 2006 by the UKIRT Infrared Deep Sky Survey with a recovery image confirming the object's proper motion on 2 March 2010.
It was initially reported to be at an even closer distance of, which would have placed it among the ten nearest astronomical objects to the Sun, but later measurements revealed that the object was in fact located at a greater distance than initially thought, at .

Space motion

UGPS 0722−05 has proper motion of about 970 milliarcseconds per year.
Radial velocity of UGPS 0722-05, measured by Bochanski et al. and published in 2011, is.