Gliese 318

Gliese 318 is a white dwarf in the constellation Pyxis. Its spectral type is DA5.5 and it has a visual magnitude of 11.85, and lies away.
The star was too faint to have had its parallax measured by the Hipparcos satellite. Earth-based measurement in 2009 gave its parallax as, yielding a distance of ; this parallax measurement has since been substantially improved by Gaia.
Gliese 318 is a rather young white dwarf with an age estimated to be 590 million years. Its temperature is around and it shines with 0.13 percent of the luminosity of the Sun. Like all white dwarfs, Gliese 318 is small, with just 1.5 percent the Sun's radius, but has around half the Sun's mass.
Bragaglia et al. suspect this star to be a double white dwarf due to strong spectral line variations. From Gaia DR2 it was not possible to confirm this claim. It is still possible that Gliese 318 is a double white dwarf and additional spectroscopic observations are needed in order to confirm this claim. Gliese 318 could be the closest double white dwarf to earth.