Universe Guide


MZ Aurigae, HD34626, HIP24938

MZ Aurigae is a blue rotating subgiant 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.

HIP24938 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD34626.

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

Location of MZ 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 MZ Aurigae, the location is 05h 20m 33.04 and +36d37`56.1 .

Proper Motion of MZ 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 -3.87 ± 0.44 miliarcseconds/year towards the north and 0.56 ± 0.86 miliarcseconds/year east if we saw them in the horizon.

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

MZ Aurigae has a spectral type of B1.5IVnp. This means the star is a blue subgiant star. The star has a B-V Colour Index of 0.02 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,262 Kelvin.

MZ Aurigae Radius has been calculated as being 11.21 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 7,798,342.94.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 4.07. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

MZ Aurigae Apparent and Absolute Magnitudes

MZ Aurigae has an apparent magnitude of 8.17 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 -2.45 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.25. 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 MZ Aurigae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.75 which gave the calculated distance to MZ Aurigae as 4348.84 light years away from Earth or 1333.33 parsecs. It would take a spaceship travelling at the speed of light, 4348.84 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 2.07 which put MZ Aurigae at a distance of 1575.67 light years or 483.09 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.

Variable Type of MZ Aurigae

The star is a rotating SX Arietis 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. MZ Aurigae brightness ranges from a magnitude of 8.307 to a magnitude of 8.141 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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.

MZ Aurigae Facts

Alternative Names

Traditional/Proper NameMZ Aurigae
Short NameMZ Aur
Hipparcos Library I.D.24938
Bonner DurchmusterungBD+36 1090
Henry Draper Designation34626

Visual Facts

Star Typesubgiant star
Absolute Magnitude-2.45 / -0.25
Visual / Apparent Magnitude8.17
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 20m 33.04
Declination (Dec.)+36d37`56.1
Galactic Latitude-0.22 degrees
Galactic Longitude170.68 degrees
1997 Distance from Earth0.75 Parallax (milliarcseconds)
 4348.84 Light Years
 1333.33 Parsecs
2007 Revised Distance from Earth2.07 Parallax (milliarcseconds)
 1575.67 Light Years
 483.09 Parsecs
Proper Motion Dec.-3.87 ± 0.44 milliarcseconds/year
Proper Motion RA.0.56 ± 0.86 milliarcseconds/year
B-V Index0.02
Radial Velocity-6.00 ± 4.50 km/s
Spectral TypeB1.5IVnp
Colour(B) blue

Variable Star Details

Variable Star ClassRotating
Variable Star TypeSX Arietis
Mean Variability Period in Days0.151
Variable Magnitude Range (Brighter - Dimmer)8.141 - 8.307

Estimated Facts

Calculated Effective Temperature9,262 Kelvin

Sources and Links

SIMBAD SourceLink

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