139 Tau
139 Tau
139 Tau is a B-type (Blue-White) star located in the constellation Taurus. It carries the designation 139 Tau.
At a distance of roughly 1,553 light-years, 139 Tau is a distant star lying deep within the Milky Way galaxy.
139 Tau is classified as a spectral class B star (B-type (Blue-White)) on the Harvard spectral classification system.
With an apparent magnitude of +4.81, 139 Tau sits near the limit of naked-eye visibility. It can be glimpsed without optical aid under dark skies, but binoculars will make observation much easier. Observers will note its blue hue, which corresponds to a B-V color index of -0.088.
Physical Properties
| Spectral Class | Class B — B-type (Blue-White) |
| Color Index (B−V) | -0.088 |
Observation
| Apparent Magnitude | +4.81 |
| Absolute Magnitude | -3.58 |
| Distance | 1,553 ly |
| Constellation | Taurus |
Position
| Right Ascension | 5h 57.99m |
| Declination | 25° 57.23′ |
Frequently Asked Questions
What type of star is 139 Tau?
139 Tau is a Class B — B-type (Blue-White) star.
How far is 139 Tau from Earth?
139 Tau is approximately 1,553.1 light-years from Earth.
Can you see 139 Tau with the naked eye?
With an apparent magnitude of 4.81, 139 Tau is visible to the naked eye.
What constellation is 139 Tau in?
139 Tau is located in the constellation Taurus.