Doppler spectroscopy
The status of Gliese 570 D as a brown dwarf was confirmed by Doppler spectroscopy at the Cerro Tololo Interamerican Observatory in Chile. The surface temperature of this substellar object was found to be a relatively cool 500 degrees Celsius, making it cooler and less luminous than any other known brown dwarf (including the prototype ), and classifying the object as a T7-8V brown dwarf. No X-rays have been reported from this brown dwarf.