WISE J1206+8401 (WISE J120604.38+840110.6, WISE 1206+8401) is a brown dwarf or planetary-mass object, discovered in 2015 with WISE and the Hubble Space Telescope. It has the spectral type Y0.
The object was found to be metal-rich in a work from 2017 and the research team found a mass of 6−14 . A later work from 2023 found a mass of 17 ±5 . It was observed with JWST, using NIRSpec and MIRI spectroscopy. This object is not discussed in detail in this work, but the researchers report the detection of molecular absorption features in their sample, including water vapor, methane, ammonia, carbon monoxide and carbon dioxide. None of their objects have any detection of phosphine. One paper mentions that WISE J1206+8401 does have deeper carbon dioxide and carbon monoxide features, when compared to other Y-dwarfs. This makes this Y-dwarf similar to CWISEP J1047+5457.