Betelgeuse vs Mira
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| Property | Betelgeuse | Mira |
|---|---|---|
| 命名 | 58Alp Ori | 68Omi Cet |
| 星座 | Orion | N/A |
| 光谱类型 | Class M — M-type (Red) | Class M — M-type (Red) |
| 视星等 | +0.45 | +6.47 |
| 绝对星等 | -5.47 | 1.66 |
| 距离 | 498 ly | 299 ly |
| 质量 | 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 famous variable red giants/supergiants of spectral type M, but at very different evolutionary stages.
- ◆ Mira is a low-mass AGB star on its final evolutionary phase before becoming a planetary nebula; Betelgeuse is a massive red supergiant heading for a supernova.
- ◆ Mira has a pulsation period of ~332 days with an enormous magnitude range; Betelgeuse shows semi-regular variability.
- ◆ Betelgeuse is vastly larger at ~887 R☉ versus Mira's ~332 R☉.
- ◆ Mira has a remarkable 13-light-year tail of shed material trailing behind it through the interstellar medium.