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29 Canis Majoris

UW Canis Majoris

Blue-white supergiant in Canis Major

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Proper Name	None
Bayer Designation	None
Flamsteed Number	29 Canis Majoris
HR (BSC)	2781
HD	57060
Variable Designation	UW Canis Majoris
Constellation	Canis Major
Right Ascension	7h 18m 40s
Declination	-24° 33' 31"
Distance	c. 1,700 light years c. 500 parsecs
Magnitude	Apparent: +4.92 Absolute: -3.70
Spectral Class	O7Ia:fp Blue-white supergiant
Optimum Visibility	January / February
Notes	29 Canis Majoris is a contact binary, a system in which two stars orbit so closely together that they exchange material with one another. The primary star of the system is an O-type supergiant at least ten times the Sun's diameter. Its companion appears to be another supergiant, rather less luminous than the primary, but nonetheless thousands of times brighter than the Sun. Eclipses of the two component stars cause a variation in the brightness of 29 Canis Majoris over a period of four days and nine hours.

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