τ Orionis (tau Orionis)
τ Orionis is a multiple giant star of spectral class B5 in the constellation of Orion.
τ Orionis visual magnitude is 3.6. Because of its moderate brightness, τ Orionis 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 Orionis is situated in the Hertzsprung–Russell diagram.
Star System Properties
τ Orionis 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 Orionis double sysyem:
Distance, Radial Speed, Proper Motion
τ Orionis is distant 554.42 light years from the Sun and it is moving far from the Sun at the speed of 20 kilometers per second.
Alternative Designations
Visibility from Your Location
Today's τ Orionis (tau Orionis) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):