WD 0346 246

WD 0346+246 is a white dwarf in the ecliptic constellation of Taurus. It was discovered in 1997 when examination of photographs taken for a survey of brown dwarfs in the Pleiades revealed a faint star with high proper motion. It is one of the coolest white dwarfs known, with an effective temperature estimated to be approximately 3900 K equaling to a spectral type of M0.

Recent studies using NASA's Spitzer Space Telescope and MDM Observatory's 2.4-meter telescope (near Tucson, Arizona, USA) shows that this white dwarf (together with another one: SDSS J110217, 48+411315.4) has a lowest (for white dwarfs) surface temperature about 3700 and 3800 degrees K due to the age of 11 to 12 billion years.