supergiant · F8Ib
Sadr
Sadr is a yellow-white supergiant (spectral type F8Ib) about 1,800 light-years away. With an apparent magnitude of 2.23 it is easy to see even from a city.
The centre of the "Northern Cross", the breast of the Swan.
Its light output is roughly 33,400 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
- ≈ 1,800 light-years
- Spectral type
- F8Ib (supergiant)
- Colour
- Yellow-white
- Apparent magnitude
- 2.23 mag
- Luminosity
- ≈ 33,400 × Sun
- Position
- Right ascension 20h 22m, declination 40.3°
More well-known stars
Data: Hipparcos / HYG catalogue (CC BY-SA 4.0). Luminosity and visibility are calculated estimates.