Dubhe vs Merak
| गुण | Dubhe | Merak |
|---|---|---|
| पदनाम | 50Alp UMa | 48Bet UMa |
| नक्षत्रमंडल | Ursa Major | Ursa Major |
| वर्णक्रम वर्ग | Class F — F-type (Yellow-White) | Class A — A-type (White) |
| आभासी परिमाण | +1.81 | +2.34 |
| निरपेक्ष परिमाण | -1.07 | 0.40 |
| दूरी | 123 ly | 79.7 ly |
| द्रव्यमान | N/A | N/A |
| त्रिज्या | N/A | N/A |
| तापमान | N/A | N/A |
| दीप्तिमानता | N/A | N/A |
मुख्य अंतर
- ◆ 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.