WD 0346+247

WD 0346+247 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, equivalent to a spectral type of M0. Although referred to as WD 0346+246 in the discovery paper, it is more correctly designated WD 0346+247.
Recent studies using NASA's Spitzer Space Telescope and MDM Observatory's 2.4-meter telescope shows that this white dwarf has a low surface temperature between 3,700 and due to it being 11 to 12 billion years old.