Boötes I (dwarf galaxy)

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Boötes Dwarf Galaxy
Observation data (J2000 epoch)
Right ascension14h 00m 06s[1]
Declination+14° 30′ 00″ ± 15″[1]
Distance197 ± 18 kly (60 ± 6 kpc)[1]
Apparent magnitude (V)13.1[a]
Apparent size (V)26′.0 ± 1′.4[1]
Other designations
Boo dSph, Boötes Satellite, Boötes Dwarf Spheroidal Galaxy, Boötes dSph galaxy,[2] PGC 4713553
See also: Galaxy, List of galaxies

The Boötes Dwarf Galaxy (Boo I dSph) is a galaxy, which appears faint, with a luminosity of 100,000 L and an absolute magnitude of –5.8. It lies about 197 thousand light-years (60.4 kiloparsecs) away in the constellation Boötes. This dwarf spheroidal galaxy appears to be tidally disrupted[1] by the Milky Way Galaxy, which it orbits, and has two stellar tails that cross over to form a cross.[citation needed] Tidally disrupted galaxies usually only form one tail.[citation needed]

Like many of the ultrafaint dwarf spheroidals, the entire galaxy appears fainter than the Rigel system (absolute magnitude –7.84).[3]



  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Belokurov, V.; Zucker, D. B.; Evans, N. W.; Wilkinson, M. I. et al. (2006). "A Faint New Milky Way Satellite in Bootes". The Astrophysical Journal 647 (2): L111–L114. arXiv:astro-ph/0604355. Bibcode 2006ApJ...647L.111B. doi:10.1086/507324.
  2. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  3. Shultz, M.; Wade, G. A.; Petit, V.; Grunhut, J.; Neiner, C.; Hanes, D.; MiMeS Collaboration (2014). "An observational evaluation of magnetic confinement in the winds of BA supergiants". Monthly Notices of the Royal Astronomical Society 438 (2): 1114. arXiv:1311.5116. Bibcode 2014MNRAS.438.1114S. doi:10.1093/mnras/stt2260.

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