main-sequence star · A5V
Alcor
Alcor is a blue-white main-sequence star (spectral type A5V) about 82 light-years away. With an apparent magnitude of 4 it is easy to see with the naked eye under a dark sky.
The "rider" next to Mizar.
Its light output is roughly 10 times that of the Sun (a rough estimate in visible light, calculated from brightness and distance).
From Germany (52° N) it never sets: it stays above the horizon all year.
Key facts
- Distance
- ≈ 82 light-years
- Spectral type
- A5V (main-sequence star)
- Colour
- Blue-white
- Apparent magnitude
- 4 mag
- Luminosity
- ≈ 10 × Sun
- Position
- Right ascension 13h 25m, declination 55°
More well-known stars
Data: Hipparcos / HYG catalogue (CC BY-SA 4.0). Luminosity and visibility are calculated estimates.