Dubhe vs Merak
| Özellik | Dubhe | Merak |
|---|---|---|
| Adlandırma | 50Alp UMa | 48Bet UMa |
| Takımyıldız | Ursa Major | Ursa Major |
| Spektral Sınıf | Class F — F-type (Yellow-White) | Class A — A-type (White) |
| Görünür Parlaklık | +1.81 | +2.34 |
| Mutlak Parlaklık | -1,07 | 0,40 |
| Mesafe | 123 ly | 79.7 ly |
| Kütle | N/A | N/A |
| Yarıçap | N/A | N/A |
| Sıcaklık | N/A | N/A |
| Parlaklık | N/A | N/A |
Temel Farklılıklar
- ◆ Both form the famous 'pointer stars' of the Big Dipper — drawing a line through them leads to Polaris.
- ◆ Dubhe is a K-type giant at ~123 light-years; Merak is an A-type main-sequence star at ~80 light-years.
- ◆ Merak is a member of the Ursa Major Moving Group and hosts a debris disk; Dubhe is not a member and moves separately.
- ◆ Dubhe has a radius of ~30 R☉, having evolved off the main sequence; Merak remains on the main sequence at ~3 R☉.
- ◆ Despite their pairing in navigation lore, the two stars are at quite different distances and unrelated physically.