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Ushakaron (Xi Tauri) - HD21364 - HIP16083

Ushakaron (Xi Tauri) is a blue eclipsing main sequence dwarf star that can be located in the constellation of Taurus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Xi Tauri is the Bayer Classification for the star. HIP16083 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD21364. The Id of the star in the Gould Star Catalogue is 4. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major.

Ushakaron has alternative name(s), 2 Tauri , ksi_Tau, 2 Tau. Ushakaron is a multiple star system with 2 stars orbiting in its solar system.

Location of Ushakaron

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 Ushakaron, the location is 03h 27m 10.12 and +09d43`58.0 .

Proper Motion of Ushakaron

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 -39.54 ± 0.68 miliarcseconds/year towards the north and 50.58 ± 1.04 miliarcseconds/year east if we saw them in the horizon.

Ushakaron 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 42.0000000 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 Ushakaron

Ushakaron has a spectral type of B9Vn. This means the star is a blue main sequence dwarf star. The star is 7454.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24312.2156617600000000s. The star has a B-V Colour Index of -0.08 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 11,099 Kelvin.

Ushakaron Radius has been calculated as being 3.09 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,151,911.70.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 2.90. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Ushakaron Apparent and Absolute Magnitudes

Ushakaron has an apparent magnitude of 3.73 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 -0.44 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.30. 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 Ushakaron

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 14.68 which gave the calculated distance to Ushakaron as 222.18 light years away from Earth or 68.12 parsecs. It would take a spaceship travelling at the speed of light, 222.18 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 15.60 which put Ushakaron at a distance of 209.08 light years or 64.10 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 7,454.00 Parsecs or 24,312.22 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 Ushakaron

The star is a eclipsing Beta Persei (Algol) 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. Ushakaron brightness ranges from a magnitude of 4.000 to a magnitude of 4.000 over its variable period. The smaller the magnitude, the brighter the star.

Meteor Showers Radiating from near Ushakaron

The Southern Taurids Meteor Shower radiants from a point near this star. The meteor shower runs typically between Sept 17-Nov 27 with a peak date of Oct. 30-Nov. 7. The speed of a meteor in the shower is 27 Km/s. The amount of meteors predicted to be seen per hour (Zenith Hourly Rate) is 27.

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.

Ushakaron Facts

Alternative Names

Traditional/Proper NameUshakaron
Short Nameksi Tau, 2 Tau
Bayer DesignationXi Tauri
Alternative Name(s)2 Tauri
Hipparcos Library I.D.16083
Bonner DurchmusterungBDD+09 439
Gould I.D.4
Henry Draper Designation21364

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude-0.44 / -0.30
Visual / Apparent Magnitude3.73
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)03h 27m 10.12
Declination (Dec.)+09d43`58.0
Galactic Latitude-37.25 degrees
Galactic Longitude174.02 degrees
1997 Distance from Earth14.68 Parallax (milliarcseconds)
 222.18 Light Years
 68.12 Parsecs
2007 Revised Distance from Earth15.60 Parallax (milliarcseconds)
 209.08 Light Years
 64.10 Parsecs
Galacto-Centric Distance24,312.22 Light Years / 7,454.00 Parsecs
Proper Motion Dec.-39.54 ± 0.68 milliarcseconds/year
Proper Motion RA.50.58 ± 1.04 milliarcseconds/year
B-V Index-0.08
Radial Velocity22.00 ± 6.60 km/s
Spectral TypeB9Vn
Colour(B) blue
Stars in Solar System2

Variable Star Details

Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol) probably

Estimated Facts

Luminosity (x the Sun)42.0000000
Calculated Effective Temperature11,099 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
21364+09 439.0A3.7000054.00000-38.00000B9Blue/White
B7.6000054.00000-38.000001991

Location of Ushakaron in Taurus


Ushakaron (Xi Tauri) Location in Taurus

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


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