Tau Canis Majoris

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τ Canis Majoris
Observation data
Epoch J2000.0
Constellation
(pronunciation)		 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
30 Canis Majoris, HR 2782, HD 57061, CD−24°5176, HIP 35415, SAO 173446, GC 9736, ADS 5977, CCDM 07187-2457

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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