Acamar
HIP 13847; Theta1 Eri
Sep: 8.2", Companion: mag 4.1
Propriedades Físicas
Posição e Identificadores
Visibilidade
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Sistema Estelar Múltiplo
Vista pela Ocular
Sep: 8.2″ · PA: 90° · N cima, L esquerda
Resolvido · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Comparação de Tamanho
Ciclo de vida estelar
Classificação Espectral
Diagrama Hertzsprung-Russell
Espectro de corpo negro
Espectro de absorção estelar
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Notas Estelares
Imagem de Levantamento
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Sobre Acamar
Descrição
Acamar is a binary star system at magnitude 3.24 in Eridanus, consisting of two white stars (A4III and A1V) separated by about 8 arcseconds. Located about 161 light-years from Earth, the pair makes one of the finest double stars in the southern sky.
Dicas de Observação
Acamar lies in the middle of Eridanus's long winding course. A small telescope reveals a beautiful pair of nearly white stars. Before Achernar was known to European astronomers, Acamar marked the end of the River. Best observed November through February.
História
The name Acamar comes from the Arabic 'akhir al-nahr,' meaning 'the end of the river' — the same root as Achernar. For ancient Greek and Arabic observers at northern latitudes, Acamar was the southernmost visible star of Eridanus, and thus the river's end.
Curiosidades
Acamar once marked the end of Eridanus for classical astronomers who could not see farther south. The discovery of the more southerly Achernar pushed the river's terminus farther toward the south celestial pole.