Color–magnitude diagram showing objects within 30 pc from the Sun. Superimposed are the Montreal cooling tracks for white dwarfs with masses between 0.4 and 1.3 M_⊙ in steps of 0.1 M_⊙ (red is pure H atmosphere or DA WDs, blue is pure He atmosphere or DB WDs). DES J2147-4035 is plotted in red, the green points are four well-studied white dwarfs from left-to-right: LHS 1402, LHS 4033, NLTT 3499, LHS 2229 and the blue point is EDR3 5616323124310350976, all discussed in the text.