Mira vs पोलारिस
| गुण | 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 |
मुख्य अंतर
- ◆ 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.