main-sequence star · A1V
Yildun
Yildun is a blue-white main-sequence star (spectral type A1V) about 172 light-years away. With an apparent magnitude of 4.37 it is easy to see with the naked eye under a dark sky.
A star in the Little Dipper; the name comes from the Turkish word for "star".
Its light output is roughly 40 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
- ≈ 172 light-years
- Spectral type
- A1V (main-sequence star)
- Colour
- Blue-white
- Apparent magnitude
- 4.37 mag
- Luminosity
- ≈ 40 × Sun
- Position
- Right ascension 17h 32m, declination 86.6°
More well-known stars
Data: Hipparcos / HYG catalogue (CC BY-SA 4.0). Luminosity and visibility are calculated estimates.