DENIS-P J1228.2-1547 is a system of two nearly equal brown dwarfs, both are of spectral types L5.5:, located in constellation Corvus at approximately 20.2 parsecs or 66.0 light-years from Earth.
History of observations DENIS-P J1228.2-1547 was one on the first free-floating L dwarfs discovered. It was discovered in 1997 by Xavier Delfosse and colleagues from the DENIS survey.
The second component (B) was discovered by Eduardo L. Martín and colleagues using near-infrared camera NICMOS on Hubble Space Telescope. It was announced in 1999.
See also The other two free-floating L dwarfs, detected by Delfosse et al. and announced in 1997: Deep Near Infrared Survey of the Southern Sky DENIS-P J1058.7-1548 DENIS-P J020529.0-115925 DENIS-P J082303.1-491201 b DENIS-P J101807.5-285931
A free-floating L dwarf, detected by Kirkpatrick et al., announced also in 1997, but earlier: 2MASP J0345432+254023
A free-floating L dwarf, detected by Ruiz et al., announced also in 1997, but later: Kelu-1
References
External links SIMBAD: DENIS-P J122815.2-154733 -- Brown Dwarf (M<0.08solMass)