τ Herculis (tau Herculis)
τ Herculis is a variable and double sub-giant star of spectral class B5 in the constellation of Hercules.
τ Herculis visual magnitude is 3.89. Because of its moderate brightness, τ Herculis is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.
Celestial Coordinates
Apparent
J2000
Galactic Coordinates
Finder Chart
Magnitude, Color, Spectral Class
The red dot in the diagram below shows where τ Herculis is situated in the Hertzsprung–Russell diagram.
Star System Properties
τ Herculis is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the τ Herculis double sysyem:
Distance, Radial Speed, Proper Motion
τ Herculis is distant 314.37 light years from the Sun and it is moving towards the Sun at the speed of 14 kilometers per second.
Alternative Designations
Visibility from Your Location
τ Herculis (tau Herculis) is circumpolar and transits at 22:15 UTC (altitude: 84.8°)