τ Canis Majoris (tau Canis Majoris)
τ Canis Majoris is a variable and multiple supergiant star of spectral class O9 in the constellation of Canis Major.
τ Canis Majoris visual magnitude is 4.4. Because of its moderate brightness, τ Canis Majoris 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
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Finder chart for τ Canis Majoris (tau Canis Majoris).
Magnitude, Color, Spectral Class

The red dot in the diagram below shows where τ Canis Majoris is situated in the Hertzsprung–Russell diagram.

Distance, Radial Speed, Proper Motion
τ Canis Majoris is distant 3,196.08 light years from the Sun and it is moving far from the Sun at the speed of 40 kilometers per second.
Alternative Designations
Visibility from Your Location
Today's τ Canis Majoris (tau Canis Majoris) rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):