Polaris
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Polaris holds the Alpha designation in Ursa Minor, the Little Bear, and is additionally listed as 1 Ursae Minoris in the Flamsteed system. It is a yellow-white F-type star, an intermediate spectral class whose colour index of 0.636 reflects a surface cooler than white A stars but warmer than the orange K types. Though it appears at a moderate apparent magnitude of 1.97, its absolute magnitude of −3.64 reveals substantial intrinsic luminosity, a brightness muted by its distance of some 433 light-years. That gap between apparent and true brightness is typical of luminous stars observed across several hundred light-years of space.
物理特性
| 光谱类型 | F Class F — F-type (Yellow-White) |
| 色指数 (B−V) | 0.636 |
观测
| 视星等 | +1.97 |
| 绝对星等 | -3.64 |
| 距离 | 433 ly |
位置
| 赤经 | 2h 31.79m |
| 赤纬 | 89° 15.85′ |
Related Chemistry
Explore the chemical elements connected to Polaris on our sister site ChemFYI.
Hydrogen lines still prominent in F-type supergiant spectra
Helium from core fusion, now in evolved shell-burning phase
Metallic absorption lines strengthen in F-type stars
Ca II H & K lines become visible in late-F spectra
Part of the Science FYI Family