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The Boötes Dwarf Galaxy (Boo dSph) is the faintest galaxy yet discovered, as of 2006, with a total luminosity of 100,000 Suns, and an absolute magnitude of -5.7. It lies 190,000 light-years away in the Bootes constellation. The dwarf spheroidal galaxy is tidally disrupted by the Milky Way Galaxy which it orbits, and has two stellar trails that cross over to form a cross. Tidally disrupted galaxies usually only form one tail.
The galaxy is fainter than the next faintest, the Ursa Major dwarf galaxy (absolute magnitude -6.75). It is also fainter than the star Rigel (absolute magnitude -6.8). This discounts dark galaxies such as VIRGOHI21 in the Virgo cluster of galaxies.
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