- Source: WISEPA J022623.98-021142.8
WISE 0226−0211 (also known as WISEPA J022623.98−021142.8) 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 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 (acquired by David Ciardi). 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.
See also
List of Y-dwarfs
other late T to Y dwarf binaries:
WISE 1217+1626 T9+Y0
WISE J0336−0143 Y+Y
CFBDSIR J1458+1013 T9+Y0
WISE 0146+4234 T9+Y0
WISE J1711+3500 T8+T9.5
