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56 Arietis, HD19832, HIP14893, HR954

56 Arietis is a blue rotating star that can be located in the constellation of Aries. 56 Arietis is the brightest star in Aries based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

The Id of the star in the Yale Bright Star Catalogue is HR954. HIP14893 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD19832.

56 Arietis has alternative name(s), SX Arietis , SX Ari.

Location of 56 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 56 Arietis, the location is 03h 12m 14.24 and +27d 15` 25.2 .

Proper Motion of 56 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 -18.57 ± 0.52 miliarcseconds/year towards the north and 12.39 ± 0.76 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 16.00000 km/s with an error of about 2.00 km/s .

56 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 61000.0000000 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 56 Arietis

56 Arietis has a spectral type of B9p Si. This means the star is a blue star. The star is 7527.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24550.3149028800000000s. The star has a B-V Colour Index of -0.1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 13,867 Kelvin.

56 Arietis Radius has been calculated as being 1.29 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 894,165.46.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.74. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

56 Arietis Apparent and Absolute Magnitudes

56 Arietis has an apparent magnitude of 5.78 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 0.50 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.16. 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 56 Arietis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.78 which gave the calculated distance to 56 Arietis as 371.48 light years away from Earth or 113.90 parsecs. It would take a spaceship travelling at the speed of light, 371.48 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 6.49 which put 56 Arietis at a distance of 502.56 light years or 154.08 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 7,527.00 Parsecs or 24,550.31 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 56 Arietis

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. 56 Arietis brightness ranges from a magnitude of 5.784 to a magnitude of 5.741 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.7 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.

56 Arietis Facts

Alternative Names

Traditional/Proper Name56 Arietis
Flamsteed Name56 Arietis
Flamsteed Short Name56 Ari
Short NameSX Ari
Alternative Name(s)SX Arietis
Hipparcos Library I.D.14893
Yale Bright Star Catalogue (HR) Id954
Bonner DurchmusterungBD+26 523
Henry Draper Designation19832

Visual Facts

Star Type star
Absolute Magnitude0.50 / -0.16
Visual / Apparent Magnitude5.78
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 12m 14.24
Declination (Dec.)+27d 15` 25.2
Galactic Latitude-25.95 degrees
Galactic Longitude157.68 degrees
1997 Distance from Earth8.78 Parallax (milliarcseconds)
 371.48 Light Years
 113.90 Parsecs
2007 Revised Distance from Earth6.49 Parallax (milliarcseconds)
 502.56 Light Years
 154.08 Parsecs
Galacto-Centric Distance24,550.31 Light Years / 7,527.00 Parsecs
Proper Motion Dec.-18.57 ± 0.52 milliarcseconds/year
Proper Motion RA.12.39 ± 0.76 milliarcseconds/year
B-V Index-0.10
Radial Velocity16.00 ± 2.00 km/s
Spectral TypeB9p Si
Colour(B) blue

Variable Star Details

Variable Star ClassRotating
Variable Star TypeSX Arietis
Mean Variability Period in Days0.728
Variable Magnitude Range (Brighter - Dimmer)5.741 - 5.784

Estimated Facts

Luminosity (x the Sun)61,000.0000000
Calculated Effective Temperature13,867 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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