z_PS1−W1 colour against spectral type. The solid blue circle indicates that the object has an NIR spectrum. All the objects have a spectral type uncertainty of one sub-type, unless specified differently in Table A.1. We adopted the classification of W1810 as esdT3 in Burgasser et al. (2025). W0156 was classified as a T subdwarf without a sub-type, we assigned it with the same late spectral type as Ross 19B. We assigned a Y0–Y2 range for the Accident, according to its effective temperature.