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Mizar

Zeta UMa (BS5054)

Estrela Dupla Observável Excelente (71/100)

Sep: 14.4", Companion: mag 3.9

HIP 65378; Zeta UMa; 79 UMa DoubleStar UMa Visível Nível 2 Small telescope (4") - Requires steady seeing
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Propriedades Físicas

Magnitude 2.27
Tipo Espectral A1VpSrSi
Cor da Estrela Branco (B-V 0.02)
Distância 69.4 ly

Posição e Identificadores

RA 13h 23m 55.5s
Dec +54° 55' 31.0"
Constelação UMa
HR 5054
HIP 65378
Bayer Zeta
Flamsteed 79 UMa
Double Cat 8891

Visibilidade

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Sistema Estelar Múltiplo

Componentes 4
IDs dos Componentes AP
Separação 14.4″
Mag da Companheira 3.9
Ângulo de Posição 153°
Cores das Estrelas A: Branco B: Branco
Descobridor STF1744

Vista pela Ocular

80x Dawes: 1.9″ TFOV: 0.6°
Realista = tamanho angular verdadeiro
N E 153° A (2.3) B (3.9)

Sep: 14.4″ · PA: 153° · N cima, L esquerda

Resolvido · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″

Comparação de Tamanho

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Ciclo de vida estelar

Classificação Espectral

Diagrama Hertzsprung-Russell

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Espectro de corpo negro

Espectro de absorção estelar

Espectro de absorção simulado com base no tipo espectral. Passe o mouse sobre as linhas para identificar os elementos.

Notas Estelares

Aa = AP 3.0 A2V, 3.0 A2V, sep. 0.0115", 0.056y, a = 0.012". Combined mag., colors AP. Binary with HR 5055. Alcor, | HR 5062, at 709", CPM.
ADS 8891Aa, 20.5386d, K 68.8k/s, V0 -5.6k/s, msin3i 1.60, asini 16.4. i 60d. vsini both components 32k/s. The | first SB to have been discovered, by Pickering in 1889. First resolved by 20-foot interferometer at Mt. Wilson by Pease | in 1925, sep. 0.01".
"Dipper Stars;" Sirius group; UMa moving cluster.
Combined spectrum for Aa also classified A1VpSrSi.
0.046".
MIZAR; Mizat; Mirza.

Imagem de Levantamento

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Sobre Mizar

Descrição

Mizar is a white star of spectral type A1VpSrSi at magnitude 2.27 in Ursa Major, famous as one of the most celebrated double stars in history. Its naked-eye companion Alcor (magnitude 4.0) sits just 12 arcminutes away. Mizar itself was the first telescopic double star discovered (1617), and each component is a spectroscopic binary — making the system at least a sextuple.

Dicas de Observação

Mizar is the middle star of the Big Dipper's handle. Look carefully with the naked eye for the fainter companion Alcor just beside it — the Mizar-Alcor pair is one of the oldest known naked-eye double star tests. A small telescope at moderate magnification splits Mizar itself into two components separated by about 14 arcseconds. Best observed March through August.

História

The name Mizar comes from the Arabic 'mi'zar,' meaning 'girdle' or 'waistcloth.' The ability to see Alcor beside Mizar was used as an eyesight test by many cultures, including the Arabs, Romans, and Native Americans. Mizar A was the first spectroscopic binary star discovered, by Edward Pickering in 1889.

Curiosidades

Mizar holds multiple 'firsts' in stellar astronomy: first telescopic double (1617), first photographed star (1857, along with Vega), and its component Mizar A was the first spectroscopic binary discovered (1889). The Mizar-Alcor system may contain six or more stars all gravitationally bound.