  We present the discovery of what appears to be both a uniquely cool and old
white dwarf within 30 parsecs of the sun. DES J214756.46-403529.3 is detected
in four separate surveys, 50 degrees away from the Galactic Plane. The
combination of its very low luminosity and spectral energy distribution
suggests an object unlike any other astrophysical body currently known. Among
8,000 of the nearest single objects in the immediate solar neighbourhood, it
appears completely isolated in multiple colour-magnitude diagrams. The data
seem compatible with an extremely old and cool white dwarf with a helium
dominated atmosphere and a mass around 0.7-0.8\,\msun\ but spectroscopic
follow-up is required to confirm its nature.
