Epsilon Đại Hùng vs Dubhe

Property Epsilon Đại Hùng Dubhe
Ký Hiệu 77Eps UMa 50Alp UMa
Chòm Sao Ursa Major Ursa Major
Phân Loại Quang Phổ Class A — A-type (White) Class F — F-type (Yellow-White)
Cấp Sao Biểu Kiến +1.76 +1.81
Cấp Sao Tuyệt Đối -0.26 -1.07
Khoảng Cách 82.5 ly 123 ly
Khối Lượng N/A N/A
Bán Kính N/A N/A
Nhiệt Độ N/A N/A
Độ Sáng N/A N/A

Key Differences

  • Both are the two brightest stars of the Big Dipper in Ursa Major, but they differ in type and motion.
  • Alioth (Epsilon UMa) is an A-type chemically peculiar variable; Dubhe (Alpha UMa) is a K-type giant.
  • Alioth is a member of the Ursa Major Moving Group; Dubhe is not and moves in the opposite direction.
  • Dubhe forms the 'pointer pair' with Merak that indicates Polaris.
  • Alioth is slightly brighter than Dubhe despite the Alpha/Epsilon designations.

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