σ Herculis (sigma Herculis)
σ Herculis is a variable and double main-sequence star of spectral class B9 in the constellation of Hercules.
σ Herculis visual magnitude is 4.2. Because of its moderate brightness, σ 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 σ Herculis is situated in the Hertzsprung–Russell diagram.
Star System Properties
σ 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 σ Herculis double sysyem:
Distance, Radial Speed, Proper Motion
σ Herculis is distant 302.13 light years from the Sun and it is moving towards the Sun at the speed of 11 kilometers per second.
Alternative Designations
Visibility from Your Location
σ Herculis (sigma Herculis) is circumpolar and transits at 22:13 UTC (altitude: 80.9°)