τ Persei (tau Persei)
τ Persei is a variable and multiple giant star of spectral class G4 in the constellation of Perseus.
τ Persei visual magnitude is 3.95. Because of its moderate brightness, τ Persei 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 Persei is situated in the Hertzsprung–Russell diagram.
Star System Properties
τ Persei 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 Persei double sysyem:
Distance, Radial Speed, Proper Motion
τ Persei is distant 247.91 light years from the Sun and it is moving far from the Sun at the speed of 2 kilometers per second.
Alternative Designations
Visibility from Your Location
τ Persei (tau Persei) is circumpolar and transits at 10:46 UTC (altitude: 88.6°)