Galáxia anã de Cassiopeia

Galáxia Anã de Cassiopeia
Galáxia anã de Cassiopeia
Dados observacionais (J2000)
Constelação Cassiopeia
Tipo Sph?[1]
Asc. reta 23h 26m 31.0s[1]
Declinação +50° 41′ 31″[1]
Distância 2.58 ± 0.13 Mal (790 ± 40 kpc)[2][3]
Redshift -307 ± 2 km/s[1]
Magnit. apar. 12.9[1]
Dimensões 2′.5 × 2′.0[1]
Outras denominações
Andromeda VII,[1] And VII,[4] Cas dSph,,[4] PGC 2807155

Cassiopeia Dwarf Galaxy[4]

Mapa

A Galáxia Anã de Cassiopeia (também conhecida como Andrômeda VII) é uma galáxia anã esferoidal a aproximadamente 2,58 milhões de anos-luz de distância na constelação de Cassiopeia. A Anã de Cassiopeia faz parte do Grupo Local de galáxias e é uma galáxia satélite da Galáxia de Andrômeda (M31).

A Anã de Cassiopeia foi encontrada em 1998, juntamente com o Anã de Pegasus, por uma equipe de astrônomos (Karachentsev e Kashibadze)[5] na Rússia e na Ucrânia. A Anã de Cassiopeia e a Anã de Pegasus estão mais longe de M31 que suas outras galáxias companheiras conhecidas, mas ainda aparecem vinculadas a ela pela gravidade. A galáxia tampouco contém quaisquer jovens, massivas estrelas ou mostra vestígios de formação estelar recente. Em vez disso, ambas parecem dominadas por estrelas muito antigas, com idades de até 10000 milhões de anos.

Ver também

Ligações externas

Referências

  1. ↑ a b c d e f g «NASA/IPAC Extragalactic Database». Results for Cassiopeia Dwarf. Consultado em 30 de novembro de 2006 
  2. ↑ I. D. Karachentsev, V. E. Karachentseva, W. K. Hutchmeier, D. I. Makarov (2004). «A Catalog of Neighboring Galaxies». Astronomical Journal. 127: 2031–2068. doi:10.1086/382905 
  3. ↑ Karachentsev, I. D.; Kashibadze, O. G. (2006). «Masses of the local group and of the M81 group estimated from distortions in the local velocity field». Astrophysics. 49 (1): 3–18. doi:10.1007/s10511-006-0002-6 
  4. ↑ a b c «SIMBAD Astronomical Database». Results for Andromeda V. Consultado em 30 de novembro de 2006 
  5. ↑ Pritzl, Barton J.; Armandroff, Taft E.; Jacoby, George H.; Da Costa, G. S. (maio de 2005), «The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda I and Andromeda III», The Astronomical Journal, 129 (5): 2232–2256, doi:10.1086/428372 
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