Mira vs Полярная звезда
| Свойство | Mira | Полярная звезда |
|---|---|---|
| Обозначение | 68Omi Cet | 1Alp UMi |
| Созвездие | N/A | N/A |
| Спектральный класс | Class M — M-type (Red) | Class F — F-type (Yellow-White) |
| Видимая звёздная величина | +6.47 | +1.97 |
| Абсолютная звёздная величина | 1,66 | -3,64 |
| Расстояние | 299 ly | 433 ly |
| Масса | N/A | N/A |
| Радиус | N/A | N/A |
| Температура | N/A | N/A |
| Светимость | N/A | N/A |
Ключевые различия
- ◆ 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.