[5] CWISEP J1047+5457 was discovered in 2020 from a preliminary CatWISE catalog, initially determined to have a spectral type of Y0.

[5] Follow-up observations with JWST spectroscopy (NIRSpec and MIRI) showed that it had a spectral type of Y1.

This causes the Spitzer ch1-ch2 color to be extremely blue (2.47 ±0.19 mag) for its spectral type and explains the misidentification as a Y0 in the discovery paper.

A low gravity is commonly associated with a young age for brown dwarfs.

The researchers also find a 52% likelyhood that it belongs to the 40 Myr old Argus association, which would lower the mass to around 1 MJ.