WISEPA J022623.98−021142.8

WISE 022−−0211 is a brown dwarf binary with a combined spectral type of T7. Its individual components have a spectral type that is as of now somewhat uncertain at T8–T8.5 for the primary and T9.5-Y0 for the secondary.
The object was first discovered in 2011 with the Wide-field Infrared Survey Explorer and follow-up observations with Keck revealed a spectral type of T7. In 2019 the same team showed that the object is a common proper motion binary with a separation of 2.1 arcseconds from Spitzer images and one H-band Keck image. The H-ch2 colors suggest a spectral type of about T8–T8.5 for the primary and about Y0 for the secondary. The absolute magnitudes on the other hand suggest spectral types of about T8–T8.5 for the primary and about T9.5–Y0 for the secondary. It is suspected that the combined spectral type of T7 is in error.