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AB Aurigae, HD31293, HIP22910

AB Aurigae is a blue 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. It is calculated at being 2.000 Billion Years old. This information comes from ExoPlanet.

HIP22910 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD31293.

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

Location of AB 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 AB Aurigae, the location is 04h 55m 45.84 and +30d 33` 04.5 .

Proper Motion of AB 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 -24.73 ± 0.55 miliarcseconds/year towards the north and 2.63 ± 0.96 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 8.90000 km/s with an error of about 0.90 km/s .

Physical Properties (Colour, Temperature, Age, Mass, Radius) of AB Aurigae

AB Aurigae has a spectral type of A0pe. This means the star is a blue star. The star is 7539.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24589.4545041600000000s. The star has a B-V Colour Index of 0.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,061 Kelvin.

AB Aurigae Radius has been calculated as being 2.72 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,890,592.42.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.62. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 2.40 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star is believed to be about 2.00 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

AB Aurigae Apparent and Absolute Magnitudes

AB Aurigae has an apparent magnitude of 7.03 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 1.23 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.31. 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 AB Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.93 which gave the calculated distance to AB Aurigae as 470.65 light years away from Earth or 144.30 parsecs. It would take a spaceship travelling at the speed of light, 470.65 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 7.18 which put AB Aurigae at a distance of 454.27 light years or 139.28 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 7,539.00 Parsecs or 24,589.45 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 AB 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. AB Aurigae brightness ranges from a magnitude of 7.118 to a magnitude of 7.061 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

AB Aurigae Facts

Alternative Names

Traditional/Proper NameAB Aurigae
Short NameAB Aur
Hipparcos Library I.D.22910
Bonner DurchmusterungBD+30 741
Henry Draper Designation31293

Visual Facts

Star Type star
Age2.00 Billion Years Old
Absolute Magnitude1.23 / 1.31
Visual / Apparent Magnitude7.03
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)04h 55m 45.84
Declination (Dec.)+30d 33` 04.5
Galactic Latitude-7.98 degrees
Galactic Longitude172.50 degrees
1997 Distance from Earth6.93 Parallax (milliarcseconds)
 470.65 Light Years
 144.30 Parsecs
2007 Revised Distance from Earth7.18 Parallax (milliarcseconds)
 454.27 Light Years
 139.28 Parsecs
Galacto-Centric Distance24,589.45 Light Years / 7,539.00 Parsecs
Proper Motion Dec.-24.73 ± 0.55 milliarcseconds/year
Proper Motion RA.2.63 ± 0.96 milliarcseconds/year
B-V Index0.13
Radial Velocity8.90 ± 0.90 km/s
Spectral TypeA0pe
Colour(A) blue

Variable Star Details

Variable Star ClassEruptive
Variable Star TypeIrregular
Mean Variability Period in Days0.049
Variable Magnitude Range (Brighter - Dimmer)7.061 - 7.118

Estimated Facts

Calculated Effective Temperature8,061 Kelvin
Mass Compared to the Sun2.40

Sources and Links

SIMBAD SourceLink

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