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V403 Aurigae, HD39743, HIP28162

V403 Aurigae is a white to yellow eruptive star that can be located in the constellation of Auriga. The star can not be seen by the naked eye, you need a telescope to see it.

HIP28162 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD39743.

V403 Aurigae has alternative name(s), V403 Aur.

Location of V403 Aurigae

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 V403 Aurigae, the location is 05h 57m 04.64 and +49d 01` 46.9 .

Proper Motion of V403 Aurigae

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 -7.79 ± 0.30 miliarcseconds/year towards the north and -5.32 ± 0.45 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -1.60000 km/s with an error of about 2.00 km/s .

V403 Aurigae 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 113.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of V403 Aurigae

V403 Aurigae has a spectral type of G8III. This means the star is a white to yellow star. The star is 7551.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24628.5941054400000000s. The star has a B-V Colour Index of 0.99 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,868 Kelvin.

V403 Aurigae Radius has been calculated as being 11.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,992,522.07.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 10.43. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V403 Aurigae Apparent and Absolute Magnitudes

V403 Aurigae has an apparent magnitude of 6.55 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 0.29 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.50. 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 V403 Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.59 which gave the calculated distance to V403 Aurigae as 583.48 light years away from Earth or 178.89 parsecs. It would take a spaceship travelling at the speed of light, 583.48 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 6.18 which put V403 Aurigae at a distance of 527.77 light years or 161.81 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 7,551.00 Parsecs or 24,628.59 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 V403 Aurigae

The star is a eruptive Irregular 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. V403 Aurigae brightness ranges from a magnitude of 6.801 to a magnitude of 6.674 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 days (variability).

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.

V403 Aurigae Facts

Alternative Names

Traditional/Proper NameV403 Aurigae
Short NameV403 Aur
Hipparcos Library I.D.28162
Bonner DurchmusterungBD+49 1423
Henry Draper Designation39743

Visual Facts

Star Type star
Absolute Magnitude0.29 / 0.50
Visual / Apparent Magnitude6.55
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 57m 04.64
Declination (Dec.)+49d 01` 46.9
Galactic Latitude11.96 degrees
Galactic Longitude163.58 degrees
1997 Distance from Earth5.59 Parallax (milliarcseconds)
 583.48 Light Years
 178.89 Parsecs
2007 Revised Distance from Earth6.18 Parallax (milliarcseconds)
 527.77 Light Years
 161.81 Parsecs
Galacto-Centric Distance24,628.59 Light Years / 7,551.00 Parsecs
Proper Motion Dec.-7.79 ± 0.30 milliarcseconds/year
Proper Motion RA.-5.32 ± 0.45 milliarcseconds/year
B-V Index0.99
Radial Velocity-1.60 ± 2.00 km/s
Spectral TypeG8III
Colour(G) White to Yellow

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.125
Variable Magnitude Range (Brighter - Dimmer)6.674 - 6.801

Estimated Facts

Luminosity (x the Sun)113.0000000
Calculated Effective Temperature4,868 Kelvin

Sources and Links

SIMBAD SourceLink

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