Naos (star)

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ζ Puppis (Naos)
dates equinoxJ2000.0 , epoch : J2000.0
Constellation Aft deck of the ship
Right ascension 08 h 03 m 35.05 s
declination -40 ° 00 ′ 11.3 ″
Apparent brightness 2.21 mag
B − V color index −0.26 
U − B color index −1.11 
R − I index −0.22 
Spectral class O5 IAf
Radial velocity (−23.9 ± 2.9) km / s
parallax (3.00 ± 0.10)  mas
distance (1090 ± 40)  Lj
335 +12−11 pc  
Visual absolute brightness M vis −5.4 mag
Proper movement 
Rec. Share: (−29.71 ± 0.08)  mas / a
Dec. portion: (16.68 ± 0.09)  mas / a
Physical Properties
Dimensions 59  M
radius 20  R
Effective temperature 42 500  K
Rotation time 15 days
Other names
and catalog entries
Bayer name ζ Puppis
Cordoba Survey CD −39 ° 3939
Bright Star Catalog HR 3165 [1]
Henry Draper Catalog HD 66811 [2]
Hipparcos catalog HIP 39429 [3]
SAO catalog SAO 198752 [4]
Tycho catalog TYC 7663-4093-1 [5]
2MASS catalog 2MASS J08033506-4000112 [6]
Other names Naos, FK5 306, IRAS 08018-3951
  1. ↑ Calculated from apparent brightness and distance.

Naos ("ship"), Bayer name Zeta Puppis (ζ Puppis), is the brightest star in the constellation aft deck of the ship (lat. Puppis). It is a blue supergiant and belongs to the spectral class O 5 Ia. It is about 1100 light years away. It has an apparent magnitude of approx. 2.25 mag. The name Naos was added to the official list of star names by the IAU on August 21, 2016 . Another historical name is Suhail Hadar ( Arabic سهيل هدار, DMG Suhail Hadār ).

Due to the division of the former constellation Argo Navis into the constellations aft deck of the ship , keel of the ship and sails of the ship , these have a common "set" of Bayer designations and Naos, therefore not alpha, but zeta as a large letter. The brightest star Alpha of Argo Navis is Canopus in the constellation Kiel des Schiff.

Naos was the main star of the ancient Egyptian constellation Stars of Water .

It is believed that the star belongs to a relatively rare group of stars, the blue stragglers .

See also

Web links

Individual evidence

  1. a b c Hipparcos catalog (ESA 1997)
  2. a b c Bright Star Catalog
  3. Pulkovo radial velocities for 35493 HIP stars
  4. a b Maíz Apellániz et al .: "Accurate distances to nearby massive stars with the new reduction of the Hipparcos raw data"; Poster for the IAU Symposium 250 from December 10-14, 2007
  5. ^ Hipparcos, the New Reduction (van Leeuwen, 2007)