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V403 Aurigae

V403 Aurigae Facts

V403 Aurigae's Alternative Names

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.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+49 1423.

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

Location of V403 Aurigae

The location of the giant 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 V403 Aurigae, the location is 05h 57m 04.64 and +49° 01` 46.9 .

Radial Velocity and Proper Motion of V403 Aurigae

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 -7.79 ± 0.30 milliarcseconds/year towards the north and -5.32 ± 0.45 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 -1.60 km/s with an error of about 2.00 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.

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 74.70 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) of V403 Aurigae

V403 Aurigae Colour and Temperature

V403 Aurigae has a spectral type of G8III. This means the star is a yellow giant star. 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

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. If you need the diameter of the star, you just need to multiple the radius by 2. 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. If you want that in miles, it is 3,102,562,113,205,108.57.

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.

Using the 2007 distance, the star is roughly 33,375,475.74 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 7,551.00 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*.

Time to Travel to V403 Aurigae

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 28,583,836,106,209.72 hours or 3,262,994,989.29 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to V403 Aurigae then it would take 103,941,222,204.40 hours / 11,865,436.32 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey 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.

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.

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Additional V403 Aurigae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameV403 Aurigae
Alternative NamesHD 39743, HIP 28162, BD+49 1423, V403 Aur
Spectral TypeG8III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourYellow
GalaxyMilky Way
ConstellationAuriga
Absolute Magnitude 0.29 / 0.50
Visual / Apparent Magnitude6.55
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 57m 04.64
Declination (Dec.)+49° 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 Distance from Earth6.18 Parallax (milliarcseconds)
 527.77 Light Years
 161.81 Parsecs
 33,375,475.74 Astronomical Units
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
Eccentricity0.15
Semi-Major Axis8657.00
Stellar Luminosity (Lsun)74.70

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

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 Calculated Facts


Radius (x the Sun)10.43
Effective Temperature4,868 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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