WISE 022âÂÂâÂÂ0211 (also known as WISEPA J022623.98âÂÂ021142.8) 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 T8âÂÂT8.5 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 (acquired by David Ciardi). The H-ch2 colors suggest a spectral type of about T8âÂÂT8.5 for the primary and about Y0 for the secondary. The absolute magnitudes on the other hand suggest spectral types of about T8âÂÂT8.5 for the primary and about T9.5âÂÂY0 for the secondary. It is suspected that the combined spectral type of T7 is in error.
other late T to Y dwarf binaries: