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'''Zeta Puppis''', also called by its traditional name '''Naos''' from the Greek ναύς "ship", or less commonly, '''Suhail Hadar''', is one of the hottest stars in the galaxy, one of the few rare class O stars visible in the night sky, and is the second brightest such star in terms of its apparent magnitude (only [[Zeta Orionis]] appears brighter).  It is located in the constellation of [[Puppis]].  Zeta Puppis is located 1,093 light years away according to the 2008 data from the [[Hipparcos]] mission.<ref>Maíz Apellániz, J.; Alfaro, E. J.; Sota, A. (2008). Accurate distances to nearby massive stars with the new reduction of the Hipparcos raw data. arΧiv:0804.2553</ref>  

'''Zeta Puppis''', also called by its traditional name '''Naos''' from the Greek ναύς "ship", or less commonly, '''Suhail Hadar''', is one of the hottest stars in the galaxy, one of the few rare class O stars visible in the night sky, and is the second brightest such star in terms of its apparent magnitude (only [[Zeta Orionis]] appears brighter).  It is located in the constellation of [[Puppis]].  Zeta Puppis is located 1,093 light years away according to the 2008 data from the [[Hipparcos]] mission.<ref>Maíz Apellániz, J.; Alfaro, E. J.; Sota, A. (2008). Accurate distances to nearby massive stars with the new reduction of the Hipparcos raw data. arΧiv:0804.2553</ref>  

Zeta Puppis is a blue [[supergiant]] star of spectral class O5IAf, making it one of the hottest stars in the [[Milky Way|galaxy]] with a surface temperature of 42,400K (in comparison, the [[Sun]] has a surface temperature of 5,780 K).<ref> Lamers & Cassinelli 1999, accurate to 200 K</ref>  The star’s mass is 59 times that of our Sun, and 20 times its diameter.

Zeta Puppis is a blue [[supergiant]] star of spectral class O5IAf, making it one of the hottest stars in the [[Milky Way|galaxy]] with a surface temperature of 42,400K (in comparison, the [[Sun]] has a surface temperature of 5,780 K).<ref>Lamers & Cassinelli 1999, accurate to 200 K</ref>  The star’s mass is 59 times that of our Sun, and 20 times its diameter.

Because Zeta Puppis is an exceptionally large class O [[supergiant]], it is one of the brightest stars in the [[Milky Way|galaxy]] in terms of absolute magnitude, at -5.96.  The star is 21,000 times as luminous as our Sun visually.  However because it is a class O blue star, most of the radiation from the star is in the [[ultraviolet]].  When this is considered, the star is 790,000 times more luminous then the [[Sun]] overall.

Because Zeta Puppis is an exceptionally large class O [[supergiant]], it is one of the brightest stars in the [[Milky Way|galaxy]] in terms of absolute magnitude, at -5.96.  The star is 21,000 times as luminous as our Sun visually.  However because it is a class O blue star, most of the radiation from the star is in the [[ultraviolet]].  When this is considered, the star is 790,000 times more luminous then the [[Sun]] overall.