アルゴル vs ポラリス (恒星)

Property アルゴル ポラリス (恒星)
名称 26Bet Per 1Alp UMi
星座 Perseus N/A
スペクトル型 Class B — B-type (Blue-White) Class F — F-type (Yellow-White)
見かけの等級 +2.09 +1.97
絶対等級 -0.11 -3.64
距離 89.9 ly 433 ly
質量 N/A N/A
半径 N/A N/A
温度 N/A N/A
光度 N/A N/A

Key Differences

  • ◆ Both are variable stars, but of different physical types.
  • ◆ Polaris is a Cepheid variable that pulsates in radius; Algol dims because a companion eclipses it.
  • ◆ Polaris's pulsation amplitude has been decreasing over the past century.
  • ◆ Algol varies every 2.87 days (eclipsing); Polaris has a period of about 3.97 days (pulsation).
  • ◆ Polaris is near the north celestial pole and vital for navigation; Algol is in Perseus and known as the Demon Star.

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