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Mu Aurigae, 11 Aurigae, HD33641, HIP24340, HR1689

Mu Aurigae is a blue star that can be located in the constellation of Auriga. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Mu Aurigae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR1689. HIP24340 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD33641.

Location of Mu 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 Mu Aurigae, the location is 05h 13m 25.73 and +38d 29` 04.8 .

Proper Motion of Mu 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 -72.93 ± 0.42 miliarcseconds/year towards the north and -19.18 ± 0.81 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 26.00000 km/s with an error of about 1.20 km/s .

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

Mu Aurigae has a spectral type of A4m. This means the star is a blue star. The star is 7446.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24286.1225942400000000s. The star has a B-V Colour Index of 0.18 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,564 Kelvin.

Mu Aurigae Radius has been calculated as being 2.95 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,050,556.46.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.78. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Mu Aurigae Apparent and Absolute Magnitudes

Mu Aurigae has an apparent magnitude of 4.82 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 1.33 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.46. 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 Mu Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 20.08 which gave the calculated distance to Mu Aurigae as 162.43 light years away from Earth or 49.80 parsecs. It would take a spaceship travelling at the speed of light, 162.43 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 21.32 which put Mu Aurigae at a distance of 152.98 light years or 46.90 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 7,446.00 Parsecs or 24,286.12 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

Mu Aurigae Facts

Alternative Names

Flamsteed Name11 Aurigae
Flamsteed Short Name11 Aur
Bayer DesignationMu Aurigae
Hipparcos Library I.D.24340
Yale Bright Star Catalogue (HR) Id1689
Bonner DurchmusterungBD+38 1063
Henry Draper Designation33641

Visual Facts

Star Type star
Absolute Magnitude1.33 / 1.46
Visual / Apparent Magnitude4.82
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 13m 25.73
Declination (Dec.)+38d 29` 04.8
Galactic Latitude-0.30 degrees
Galactic Longitude168.35 degrees
1997 Distance from Earth20.08 Parallax (milliarcseconds)
 162.43 Light Years
 49.80 Parsecs
2007 Revised Distance from Earth21.32 Parallax (milliarcseconds)
 152.98 Light Years
 46.90 Parsecs
Galacto-Centric Distance24,286.12 Light Years / 7,446.00 Parsecs
Proper Motion Dec.-72.93 ± 0.42 milliarcseconds/year
Proper Motion RA.-19.18 ± 0.81 milliarcseconds/year
B-V Index0.18
Radial Velocity26.00 ± 1.20 km/s
Spectral TypeA4m
Colour(A) blue

Estimated Facts

Calculated Effective Temperature7,564 Kelvin

Sources and Links

SIMBAD SourceLink

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