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Kappa Tauri, 65 Tauri, HD27934, HIP20635, HR1387

Kappa Tauri is a blue 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.

Kappa Tauri is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR1387. HIP20635 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD27934.

Location of Kappa Tauri

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 Tauri, the location is 04h 25m 22.10 and +22d 17` 38.3 .

Proper Motion of Kappa Tauri

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 -45.04 ± 0.13 miliarcseconds/year towards the north and 105.10 ± 0.21 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 37.30000 km/s with an error of about 1.00 km/s .

Physical Properties (Colour, Temperature, Radius) of Kappa Tauri

Kappa Tauri has a spectral type of A7IV-V. This means the star is a blue star. The star is 7445.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24282.8609608000000000s. The star has a B-V Colour Index of 0.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,224 Kelvin.

Kappa Tauri Radius has been calculated as being 3.11 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,163,780.90.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 3.12. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.05 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Kappa Tauri Apparent and Absolute Magnitudes

Kappa Tauri has an apparent magnitude of 4.21 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 0.85 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.84. 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 Tauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 21.27 which gave the calculated distance to Kappa Tauri as 153.34 light years away from Earth or 47.01 parsecs. It would take a spaceship travelling at the speed of light, 153.34 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 21.19 which put Kappa Tauri at a distance of 153.92 light years or 47.19 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 7,445.00 Parsecs or 24,282.86 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.

Kappa Tauri Facts

Alternative Names

Flamsteed Name65 Tauri
Flamsteed Short Name65 Tau
Bayer DesignationKappa Tauri
Hipparcos Library I.D.20635
Yale Bright Star Catalogue (HR) Id1387
Bonner DurchmusterungBD+21 642
Henry Draper Designation27934

Visual Facts

Star Type star
Absolute Magnitude0.85 / 0.84
Visual / Apparent Magnitude4.21
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)04h 25m 22.10
Declination (Dec.)+22d 17` 38.3
Galactic Latitude-18.48 degrees
Galactic Longitude174.56 degrees
1997 Distance from Earth21.27 Parallax (milliarcseconds)
 153.34 Light Years
 47.01 Parsecs
2007 Revised Distance from Earth21.19 Parallax (milliarcseconds)
 153.92 Light Years
 47.19 Parsecs
Galacto-Centric Distance24,282.86 Light Years / 7,445.00 Parsecs
Proper Motion Dec.-45.04 ± 0.13 milliarcseconds/year
Proper Motion RA.105.10 ± 0.21 milliarcseconds/year
B-V Index0.13
Radial Velocity37.30 ± 1.00 km/s
Iron Abundance0.05 ± 9.99 Fe/H
Spectral TypeA7IV-V
Associated / Clustered StarsKappa Tauri B
Colour(A) blue

Estimated Facts

Calculated Effective Temperature8,224 Kelvin

Sources and Links

SIMBAD SourceLink

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