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Kappa Arietis, 12 Arietis, HD12869, HIP9836, HR613

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

Kappa Arietis's Alternative Names

Kappa Arietis is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR613. HIP9836 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD12869.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 12 Arietis with it shortened to 12 Ari.

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+21 279.

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

Location of Kappa Arietis

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 Kappa Arietis, the location is 02h 06m 33.91 and +22° 38` 54.3 .

Proper Motion of Kappa Arietis

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 -37.55 ± 0.26 miliarcseconds/year towards the north and 17.86 ± 0.37 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 11.50000 km/s with an error of about 2.80 km/s .

Kappa Arietis 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 25.41 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 Kappa Arietis

Kappa Arietis has a spectral type of A2m. This means the star is a blue star. The star is 7,436.00 Parsecs from the Galactic Centre or terms of Light Years is 24,253.51 s. The star has a B-V Colour Index of 0.12 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,178 Kelvin.

Kappa Arietis Radius has been calculated as being 2.64 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,836,883.20.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.56. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Kappa Arietis Apparent and Absolute Magnitudes

Kappa Arietis has an apparent magnitude of 5.03 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 1.30. 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 Kappa Arietis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 17.40 which gave the calculated distance to Kappa Arietis as 187.45 light years away from Earth or 57.47 parsecs. It would take a spaceship travelling at the speed of light, 187.45 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 17.96 which put Kappa Arietis at a distance of 181.61 light years or 55.68 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 7,436.00 Parsecs or 24,253.51 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.

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Kappa Arietis Facts

Visual Facts


 Kappa Arietis
Alternative NamesHD 12869, HIP 9836, HR 613, 12 Arietis, 12 Ari, BD+21 279
Spectral TypeA2m
Multiple Star SystemNo / Unknown
Star TypeStar
Colour blue
GalaxyMilky Way
ConstellationAries
Absolute Magnitude1.23 / 1.30
Visual / Apparent Magnitude5.03
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)02h 06m 33.91
Declination (Dec.)+22° 38` 54.3
Galactic Latitude-37.02 degrees
Galactic Longitude144.78 degrees
1997 Distance from Earth17.40 Parallax (milliarcseconds)
 187.45 Light Years
 57.47 Parsecs
2007 Distance from Earth17.96 Parallax (milliarcseconds)
 181.61 Light Years
 55.68 Parsecs
Galacto-Centric Distance24,253.51 Light Years / 7,436.00 Parsecs
Proper Motion Dec.-37.55 ± 0.26 milliarcseconds/year
Proper Motion RA.17.86 ± 0.37 milliarcseconds/year
B-V Index0.12
Radial Velocity11.50 ± 2.80 km/s
Eccentricity0.11
Semi-Major Axis8315.00
Stellar Luminosity (Lsun)25.41

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature8,178 Kelvin

Sources and Links


SIMBAD SourceLink

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