Gliese 318

Template:Short description Template:Starbox begin Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end 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 Template:Convert 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 Template:Val, yielding a distance of Template:Val; 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 Template:Val 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 (Template:Earth radius),Template:Efn 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.