Zeta Puppis
 Artistic depiction of Zeta Puppis (Naos). |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Puppis |
| Right ascension | 08h 03m 35.1s |
| Declination | −40° 00′ 11.6″ |
| Apparent magnitude (V) | 2.25 |
| Characteristics | |
| Spectral type | O4If(n)p |
| U−B color index | −1.09 |
| B−V color index | −0.27 |
| Variable type | Suspected α Cyg |
| Astrometry | |
| Proper motion (μ) |
RA: −27.91 mas/yr Dec.: 16.68 mas/yr |
| Parallax (π) | 3.01 ± 0.10mas |
| Distance | 1,080 ± 40 ly (330 ± 10 pc) |
| Absolute magnitude (MV) | -5.15 - -6.73 |
| Details | |
| Mass | 22.5-56.6 M☉ |
| Radius | 14-26 R☉ |
| Luminosity (bolometric) | 550,000-800,000 L☉ |
| Surface gravity (log g) | 3.5-3.9 cgs |
| Temperature | 40,000-44,000 K |
| Metallicity [Fe/H] | 0.34 dex |
| Rotational velocity (v sin i) | >220 km/s |
| Age | 1.8-3.2 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Puppis (ζ Puppis, abbreviated Zeta Pup, ζ Pup), also named Naos, is a star in the constellation of Puppis.
The spectral class of O4 means this is one of the hottest, and most luminous, stars visible to the naked eye. It is one of the sky's few naked-eye class O-type stars as well as one of the closest to Earth. It is a blue supergiant, one of the most luminous stars in the Milky Way. Visually it is over 10,000 times brighter than the Sun, but its high temperature means that most of its radiation is in the ultraviolet and its bolometric luminosity is over 500,000 times that of the Sun. It is also the 62nd brightest star in terms of apparent magnitude from Earth.
Naos is typical of O-type stars in having an extremely strong stellar wind, measured at 2,500 km/s, which sees the star shed more than a millionth of its mass each year, or about 10 million times that shed by the Sun over a comparable time period.
ζ Puppis (Latinised to Zeta Puppis) is the star's Bayer designation.
It also bears the traditional names Naos (/ˈneɪ.ɒs/, from the Greek ναύς "ship") and Suhail Hadar (سهيل هدار, possibly "roaring bright one") in Arabic. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Naos for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.
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