τ Ophiuchi (tau Ophiuchi)
τ Ophiuchi is a variable and multiple main-sequence star of spectral class F2 in the constellation of Ophiuchus.
τ Ophiuchi visual magnitude is 5.24. Because of its faintness, τ Ophiuchi is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.
Celestial Coordinates
Apparent
J2000
Galactic Coordinates
Finder Chart
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Finder chart for τ Ophiuchi (tau Ophiuchi).
Magnitude, Color, Spectral Class
The red dot in the diagram below shows where τ Ophiuchi is situated in the Hertzsprung–Russell diagram.
Star System Properties
τ Ophiuchi is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the τ Ophiuchi double sysyem:
Distance, Radial Speed, Proper Motion
τ Ophiuchi is distant 169.61 light years from the Sun and it is moving towards the Sun at the speed of 40 kilometers per second.
Alternative Designations
Visibility from Your Location
Today's τ Ophiuchi (tau Ophiuchi) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):