[1] WISE J1711+3500 was discovered in 2011 with the Wide-field Infrared Survey Explorer and with a spectrum from NASA IRTF as a T8 dwarf.
[4] In 2012 it was discovered that this object is a binary from imaging with the Keck telescope.
The individual spectral types were estimated to be T8 for the primary and T9.5 for the secondary.
The pair is separated by 15 ± 2 astronomical units (AU).
The orbital period was poorly constrained, but is larger than 200 years.