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Naos

Suhail Hadar, Zeta Puppis

Blue-white Star in Puppis

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Proper Names	Naos, Suhail Hadar
Bayer Designation	Zeta Puppis
Flamsteed Number	None
HR (BSC)	3165
HD	66811
Constellation	Puppis
Right Ascension	8h 3m 35s
Declination	-40° 0' 11"
Distance	c.1,100 light years c.300 parsecs
Magnitude	Apparent: +2.2 Absolute: -5.4
Spectral Class	O5If Blue-white supergiant
Optimum Visibility	February
Notes	Naos is a supergiant belonging to one of the hottest classes of stars, the bright blue O-type. It has a surface temperature of some 42,000 K, making it about seven times hotter than the Sun, and emits about 400,000 times as much energy (although much of this is in ultraviolet wavelengths invisible to the human eye).

Despite its 'zeta' designation, Naos appears in the sky as the brightest of Puppis' stars. In reality, it is brighter still, and belongs to the highly luminous and hot O-type supergiants. Its distance from Earth is so great, though, that it appears relatively dim in comparison with closer stars.

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