Universe Guide
SearchTwitterComments

Naos (Zeta Puppis) Star Facts

Naos Facts

Naos's Alternative Names

Zeta Puppis (Zet Pup) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in the early nineteenth century. The brightest star in the constellation is normally given the Alpha designation although there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR3165. HIP39429 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD66811.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 248 G. Puppis. There are no stars with a Gould designation in Ursa Major for example.

More details on objects' alternative names can be found at Star Names .

Location of Naos

The location of the supergiant star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the object is compared to the celestial equator and is expressed in degrees. For Naos, the location is 08h 03m 35.07 and -40° 00` 11.5 .

Radial Velocity and Proper Motion of Naos

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving 16.68 ± 0.08 milliarcseconds/year towards the north and -29.71 ± 0.10 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -23.90 km/s with an error of about 2.90 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Naos Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 125,579.09 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature, Radius) of Naos

Naos Colour and Temperature

Naos has a spectral type of O5IAf. This means the star is a blue - white supergiant star. The star has a B-V Colour Index of -0.26 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 30,256 Kelvin.

Naos Radius

Naos has been calculated as 14.00 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,741,200.00.km. If you need the diameter of the star, you just need to multiple the radius by 2.

Naos Apparent and Absolute Magnitudes

Naos has an apparent magnitude of 2.21 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -5.95 If you used the 2007 Parallax value, you would get an absolute magnitude of -5.40. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to Naos

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.33 which gave the calculated distance to Naos as 1399.84 light years away from Earth or 429.18 parsecs. It would take a spaceship travelling at the speed of light, 1399.84 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 3.01 which put Naos at a distance of 1083.60 light years or 332.23 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Using the 2007 distance, the star is roughly 68,526,879.08 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,487.00 Parsecs or 24,419.85 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Meteor Showers Radiating from near Naos

The Puppid/Velids Meteor Shower radiants from a point near this star. The meteor shower runs typically between Dec 01 - Dec 15 with a peak date of Dec 07. The speed of a meteor in the shower is 40 Km/s. The amount of meteors predicted to be seen per hour (Zenith Hourly Rate) is 40.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Hide Explanations
Show GridLines

Additional Naos Facts and Figures

Visual Facts


Primary / Proper / Traditional NameNaos
Alternative NamesZeta Puppis, Zet Pup, HD 66811, HIP 39429, HR 3165, 248 G. Puppis
Spectral TypeO5IAf
Constellation's Main StarYes
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourBlue
GalaxyMilky Way
ConstellationPuppis
Absolute Magnitude -5.95 / -5.40
Visual / Apparent Magnitude2.21
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 03m 35.07
Declination (Dec.)-40° 00` 11.5
Galactic Latitude-4.71 degrees
Galactic Longitude255.98 degrees
1997 Distance from Earth2.33 Parallax (milliarcseconds)
 1399.84 Light Years
 429.18 Parsecs
2007 Distance from Earth3.01 Parallax (milliarcseconds)
 1083.60 Light Years
 332.23 Parsecs
 68,526,879.08 Astronomical Units
Galacto-Centric Distance24,419.85 Light Years / 7,487.00 Parsecs
Proper Motion Dec.16.68 ± 0.08 milliarcseconds/year
Proper Motion RA.-29.71 ± 0.10 milliarcseconds/year
B-V Index-0.26
Radial Velocity-23.90 ± 2.90 km/s
Eccentricity0.59
Semi-Major Axis14595.00
Stellar Luminosity (Lsun)125,579.09
Brightest in Night Sky70th

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)14.00 (14.00 - 26.00)
Effective Temperature30,256 Kelvin

Sources and Links


SIMBAD SourceLink

Location of Naos in Puppis


Naos Location in Puppis

The map was generated using Night Vision, an awesome free application by Brian Simpson.

Puppis Main Stars


Comments and Questions

There's no register feature and no need to give an email address if you don't need to. All messages will be reviewed before being displayed. Comments may be merged or altered slightly such as if an email address is given in the main body of the comment.

You can decline to give a name which if that is the case, the comment will be attributed to a random star. A name is preferred even if its a random made up one by yourself.

   
x
This website is using cookies. More info. That's Fine