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Mesarthim (Gamma Arietis) - HD11502 - HIP8832 - HR546

Mesarthim (Gamma Arietis) is a blue star that can be located in the constellation of Aries. Gamma Arietis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR546. HIP8832 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD11502. Mesarthim has alternative name(s), 5 Arietis , 5 Ari. Mesarthim is a multiple star system with 2 stars orbiting in its solar system.

Location of Mesarthim

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 Mesarthim, the location is 01h 53m 31.77 and +19d17`38.7 .

Proper Motion of Mesarthim

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 -097.63 ± 000.58 towards the north and 079.20 ± 000.96 east if we saw them in the horizon.

Mesarthim 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 44000.0000000 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 Mesarthim

Mesarthim has a spectral type of A1p Si. This means the star is a blue star. The star has a B-V Colour Index of -0.04 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,437 Kelvin.

Mesarthim has been calculated as 2.49 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,732,864.36.km.

Mesarthim Apparent and Absolute Magnitudes

Mesarthim has an apparent magnitude of 3.88 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 -0.10 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.37. 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 Mesarthim

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 15.96 which gave the calculated distance to Mesarthim as 204.36 light years away from Earth or 62.66 parsecs. It would take a spaceship travelling at the speed of light, 204.36 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 19.88 which put Mesarthim at a distance of 164.07 light years or 50.30 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.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Mesarthim Facts

Alternative Names

Traditional NameMesarthim
Short Name5 Ari
Bayer DesignationGamma Arietis
Alternative Name(s)5 Arietis
Hipparcos Library I.D.8832
Yale Bright Star Catalogue (HR) Id546
Bonner DurchmusterungBD+18 243
Henry Draper Designation11502

Visual Facts

Star Type star
Absolute Magnitude-0.10 / 0.37
Apparent Magnitude3.88
Right Ascension (R.A.)01h 53m 31.77
Declination (Dec.)+19d17`38.7
1997 Distance from Earth15.96 Parallax (milliarcseconds)
 204.36 Light Years
 62.66 Parsecs
2007 Revised Distance from Earth19.88 Parallax (milliarcseconds)
 164.07 Light Years
 50.30 Parsecs
Proper Motion Dec.-97.63 ± 0.58 milliarcseconds/year
Proper Motion RA.79.20 ± 0.96 milliarcseconds/year
B-V Index-0.04
Spectral TypeA1p Si
Colour(A) blue
Stars in Solar System2

Estimated Facts

Radius (x the Sun)2.49
Luminosity (x the Sun)44,000.0000000
Calculated Effective Temperature11,437 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
11502+18 243.0A4.8000082.00000-98.00000A0White
11503B4.8000079.00000-109.00000A0White1959
11557+18 244.0C9.600001.00000-33.00000KOrange1924
CD13.600001878

Location of Mesarthim in Aries


Mesarthim (Gamma Arietis) Location in Aries

The map was generated using Night Vision, an awesome free application by Brian Simpson.


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