WD 0346+246

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WD 0346+246
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Taurus
Right ascension  03h 46m 46.508s[1]
Declination +24° 56′ 02.82″[1]
Apparent magnitude (V) 19.0[1]
Proper motion (μ) RA: 547[1] mas/yr
Dec.: -1182[1] mas/yr
Parallax (π)36 ± 5[1] mas
Distanceapprox. 90 ly
(approx. 28 pc)
Mass0.77[2] M
Radius0.011 ± 0.001[3] R
Temperature3,800 ± 100[3] K
Age11 - 12 [3] Gyr
Other designations
WD 0346+246, WD J0346+249[1]
Database references

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.[4]

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 K due to the age of 11 to 12 billion years. [3]


  1. ^ a b c d e f g "WD 0346+246". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 5, 2007.
  2. ^ https://arxiv.org/pdf/1204.2570v1.pdf
  3. ^ a b c d http://www.spacedaily.com/reports/12_Billion_Year_Old_White_Dwarf_Stars_Only_100_Light_Years_Away_999.html
  4. ^ WD 0346+246: A Very Low Luminosity, Cool Degenerate in Taurus, N. C. Hambly, S. J. Smartt, and S. Hodgkin, Astrophysical Journal Letters 489 (November 1997), pp. L157–L160.