TY Coronae Borealis

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TY Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 16h 01m 23.17s[1]
Declination +36° 48′ 35.2″[1]
Apparent magnitude (V) 14.53[2]
Distance101[1] ly
(31 pc)
Spectral typeDA4.4[1]
Other designations
TY CrB, Ross 808, WD 1600+369, LTT 14769, NLTT 41782, 2MASS J16012317+3648351

TY Coronae Borealis, also known as Ross 808, is a variable white dwarf star of the DAV (or ZZ Ceti) type in the constellation Corona Borealis. It has a surface temperature of 11,213 ± 130 K and a mass around 70% times that of the Sun, but only 1.1% of its diameter.[3] It is around 100 light-years distant from Earth.[1] It was confirmed as a variable star in 1976.[4]


  1. ^ a b c d e "TY CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 December 2016.
  2. ^ Watson, Christopher (4 January 2010). "TY Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 23 November 2014.
  3. ^ Romero, A. D.; Córsico, A. H.; Althaus, L. G.; Kepler, S. O.; Castanheira, B. G.; Miller Bertolami, M. M. (2012). "Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models". Monthly Notices of the Royal Astronomical Society. 420 (2): 1462–80. arXiv:1109.6682. Bibcode:2012MNRAS.420.1462R. doi:10.1111/j.1365-2966.2011.20134.x.
  4. ^ McGraw, John T.; Robinson, Edward L. (1976). "High-speed photometry of luminosity-variable DA dwarfs: R808, GD 99, and G 117-B15A". Astrophysical Journal Letters. 205: L155–58. Bibcode:1976ApJ...205L.155M. doi:10.1086/182112.