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Haedus, Zeta Aurigae, 8 Aurigae, HD32068, HIP23453

Haedus (Zeta Aurigae) is a orange to red eclipsing luminous giant star that can be located in the constellation of Auriga. Haedus is the brightest star in Auriga based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Zeta Aurigae is the Bayer Classification for the star. HIP23453 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32068.

Haedus has alternative name(s), zet Aur.

Location of Haedus

The location of the star in the galaxy 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 star is compared to the celestial equator and is expressed in degrees. For Haedus, the location is 05h 02m 28.68 and +41d04`33.2 .

Proper Motion of Haedus

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 -20.71 ± 0.18 miliarcseconds/year towards the north and 9.45 ± 0.29 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Haedus

Haedus has a spectral type of K4II comp. This means the star is a orange to red luminous giant star. The star is 7632.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24892.7864140800000000s. The star has a B-V Colour Index of 1.15 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,663 Kelvin.

Haedus Radius has been calculated as being 63.33 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 44,064,486.14.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 63.04. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.06 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Haedus Apparent and Absolute Magnitudes

Haedus has an apparent magnitude of 3.69 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 -3.23 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.22. 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 Haedus

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.14 which gave the calculated distance to Haedus as 787.83 light years away from Earth or 241.55 parsecs. It would take a spaceship travelling at the speed of light, 787.83 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 4.15 which put Haedus at a distance of 785.94 light years or 240.96 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.

The star's Galacto-Centric Distance is 7,632.00 Parsecs or 24,892.79 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of Haedus

The star is a eclipsing Beta Persei (Algol)/System with one or both giant or supergiant components variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. Haedus brightness ranges from a magnitude of 3.876 to a magnitude of 3.842 over its variable period. The smaller the magnitude, the brighter the star.

Meteor Showers Radiating from near Haedus

The Zeta Aurigids Meteor Shower radiants from a point near this star. The meteor shower runs typically between 11-Dec - 21 Jan with a peak date of 31-Jan.

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.

Haedus Facts

Alternative Names

Traditional/Proper NameHaedus
Flamsteed Name8 Aurigae
Flamsteed Short Name8 Aur
Short Namezet Aur
Bayer DesignationZeta Aurigae
Hipparcos Library I.D.23453
Bonner DurchmusterungBD+40 1142
Henry Draper Designation32068

Visual Facts

Star Typeluminous giant star
Absolute Magnitude-3.23 / -3.22
Visual / Apparent Magnitude3.69
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 02m 28.68
Declination (Dec.)+41d04`33.2
Galactic Latitude-0.43 degrees
Galactic Longitude165.02 degrees
1997 Distance from Earth4.14 Parallax (milliarcseconds)
 787.83 Light Years
 241.55 Parsecs
2007 Revised Distance from Earth4.15 Parallax (milliarcseconds)
 785.94 Light Years
 240.96 Parsecs
Galacto-Centric Distance24,892.79 Light Years / 7,632.00 Parsecs
Proper Motion Dec.-20.71 ± 0.18 milliarcseconds/year
Proper Motion RA.9.45 ± 0.29 milliarcseconds/year
B-V Index1.15
Radial Velocity11.32 ± 0.30 km/s
Iron Abundance-0.06 ± 9.99 Fe/H
Eccentricity0.41
Inclination99.33
Semi-Major Axis4.18
Orbital Period (Days)972.16
Argument Of Periastron336.00
Spectral TypeK4II comp
Colour(K) Orange to Red

Variable Star Details

Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/System with one or both giant or supergiant components
Variable Magnitude Range (Brighter - Dimmer)3.842 - 3.876

Estimated Facts

Calculated Effective Temperature4,663 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Location of Haedus in Auriga


Haedus (Zeta Aurigae) Location in Auriga

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


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