알골 vs 폴라리스
Intrinsic output is the great divide here. 폴라리스 carries an absolute magnitude of −3.64 to −0.11 for 알골, near 26 times the true luminosity. 알골 trails in apparent brightness at magnitude +2.09 against +1.97, leaving 폴라리스 around 1.1 times the brighter target. 폴라리스 is an F-type star, while 알골 is a B-type star in Perseus. 폴라리스 is the remoter of the pair at 433 light-years, roughly 4.8 times the 89.9 that separates us from 알골.
Property comparison
| Property | 알골 | 폴라리스 |
|---|---|---|
| 명칭 | 26Bet Per | 1Alp UMi |
| 별자리 | Perseus | N/A |
| 분광형 | Class B — B-type (Blue-White) | Class F — F-type (Yellow-White) |
| 겉보기 등급 | +2.09 | +1.97 |
| 절대 등급 | -0.11 | -3.64 |
| 거리 | 89.9 ly | 433 ly |
| 질량 | N/A | N/A |
| 반지름 | N/A | N/A |
| 온도 | N/A | N/A |
| 광도 | N/A | N/A |
Full data for each star: 알골 · 폴라리스
Key differences
Key Differences
- ◆ Both are variable stars, but of different physical types.
- ◆ Polaris is a Cepheid variable that pulsates in radius; Algol dims because a companion eclipses it.
- ◆ Polaris's pulsation amplitude has been decreasing over the past century.
- ◆ Algol varies every 2.87 days (eclipsing); Polaris has a period of about 3.97 days (pulsation).
- ◆ Polaris is near the north celestial pole and vital for navigation; Algol is in Perseus and known as the Demon Star.