ESO 439-26

ESO 439-26 is the least luminous white dwarf star known.[1][2] Located 140 light years away from the Sun, it is roughly 10 billion years old and has a temperature of 4560 Kelvin. Thus, despite being classified as a "white dwarf", it would actually appear reddish in color.[3]

References
  1. "ESO 439-26". iopscience.iop.org. doi:10.1086/309845/fulltext/5601.text.html.
  2. "The Faintest Known White Dwarf (1Mar96)". www.noao.edu.
  3. Kaler, James B. (May 7, 2006). "The Hundred Greatest Stars". Springer Science & Business Media – via Google Books.
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