Tau Canis Majoris
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| Observation data Equinox J2000.0 |
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|---|---|
| Constellation | Canis Major |
| Right ascension | 07h18m42.4s |
| Declination | −24°57′15″ |
| Apparent magnitude (V) | +4.37 |
| Distance | 3200 ± 2200 ly (980 ± 680 pc) |
| Spectral type | O9Ib |
| Other designations | |
Tau Canis Majoris (τ CMa / τ Canis Majoris) is an eclipsing spectroscopic binary in the constellation Canis Major and the brightest star of an open cluster designated NGC 2362. It is approximately 3200 light years from Earth.
τ Canis Majoris is classified as an O-type blue supergiant with a mean apparent magnitude of +4.37. It is a Beta Lyrae type variable star with a period of 1.28 days, over which time its brightness varies from magnitude +4.32 to +4.37.
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