Mira vs पोलारिस

Property Mira पोलारिस
पदनाम 68Omi Cet 1Alp UMi
नक्षत्रमंडल N/A N/A
वर्णक्रम वर्ग Class M — M-type (Red) Class F — F-type (Yellow-White)
आभासी परिमाण +6.47 +1.97
निरपेक्ष परिमाण 1.66 -3.64
दूरी 299 ly 433 ly
द्रव्यमान N/A N/A
त्रिज्या N/A N/A
तापमान N/A N/A
दीप्तिमानता N/A N/A

Key Differences

  • Both are famous variable stars in the northern sky, though entirely different types.
  • Polaris is a Cepheid variable that pulsates predictably and was used to calibrate the Cepheid distance ladder.
  • Mira is a long-period Mira-type variable that can range from naked-eye visibility to complete invisibility.
  • Polaris is celebrated as the North Star for its positional stability near the pole; Mira is celebrated as the first recognized variable star (1596).
  • Polaris's pulsation amplitude has been shrinking over the past century; Mira continues its large-amplitude cycle.

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