main-sequence star · B2.5V
Nunki
Nunki is a blue main-sequence star (spectral type B2.5V) about 228 light-years away. With an apparent magnitude of 2.05 it is easy to see even from a city.
The second-brightest star in Sagittarius.
Its light output is roughly 630 times that of the Sun (a rough estimate in visible light, calculated from brightness and distance).
From Germany (52° N) it rises and sets; it is best seen in the evening in July.
Key facts
- Distance
- ≈ 228 light-years
- Spectral type
- B2.5V (main-sequence star)
- Colour
- Blue
- Apparent magnitude
- 2.05 mag
- Luminosity
- ≈ 630 × Sun
- Position
- Right ascension 18h 55m, declination -26.3°
More well-known stars
Data: Hipparcos / HYG catalogue (CC BY-SA 4.0). Luminosity and visibility are calculated estimates.