Alcyone
25Eta Tau
Alcyone is a B-type (Blue-White) star located in the constellation Taurus. It carries the designation 25Eta Tau.
Located approximately 403.2 light-years from Earth, Alcyone resides within the broader disk of our Milky Way galaxy.
Alcyone is classified as a spectral class B star (B-type (Blue-White)) on the Harvard spectral classification system.
At an apparent magnitude of +2.85, Alcyone is visible to the naked eye under reasonably clear skies. It may require dark-sky conditions to be seen comfortably in areas with significant light pollution. Observers will note its blue hue, which corresponds to a B-V color index of -0.086.
Physical Properties
| Spectral Class | Class B — B-type (Blue-White) |
| Color Index (B−V) | -0.086 |
Observation
| Apparent Magnitude | +2.85 |
| Absolute Magnitude | -2.61 |
| Distance | 403 ly |
| Constellation | Taurus |
Position
| Right Ascension | 3h 47.48m |
| Declination | 24° 6.31′ |
Frequently Asked Questions
What type of star is Alcyone?
Alcyone is a Class B — B-type (Blue-White) star.
How far is Alcyone from Earth?
Alcyone is approximately 403.2 light-years from Earth.
Can you see Alcyone with the naked eye?
With an apparent magnitude of 2.85, Alcyone is visible to the naked eye.
What constellation is Alcyone in?
Alcyone is located in the constellation Taurus.