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135 Tauri, HD39019, HIP27581, HR2016

135 Tauri is a white to yellow giant star that can be located in the constellation of Taurus. The description is based on the spectral class. 135 Tauri is not part of the constellation but is within the borders of the constellation.

The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

135 Tauri's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR2016. HIP27581 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD39019.

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 135 Tauri with it shortened to 135 Tau.

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+14 1041.

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

Location of 135 Tauri

The location of the star in the night sky 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 135 Tauri, the location is 05h 50m 28.90 and +14° 18` 20.5 .

Radial Velocity and Proper Motion of 135 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 -37.53 ± 0.23 miliarcseconds/year towards the north and 7.27 ± 0.34 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 the Sun is 45.30 km/s with an error of about 0.70 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

135 Tauri 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 69.50 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 135 Tauri

135 Tauri has a spectral type of G9III:. This means the star is a white to yellow giant star. The star is 7,494.00 Parsecs from the Galactic Centre or terms of Light Years is 24,442.68 s. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,849 Kelvin.

135 Tauri Radius has been calculated as being 9.90 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,887,748.44.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 10.04. 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 0.01 with an error value of 0.06 Fe/H with the Sun has a value of 1 to put it into context.

135 Tauri Apparent and Absolute Magnitudes

135 Tauri has an apparent magnitude of 5.54 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 0.63 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.60. 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 135 Tauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.44 which gave the calculated distance to 135 Tauri as 312.42 light years away from Earth or 95.79 parsecs. It would take a spaceship travelling at the speed of light, 312.42 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 10.30 which put 135 Tauri at a distance of 316.66 light years or 97.09 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.

Using the 2007 distance, the star is roughly 20,026,110.49 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

The star's Galacto-Centric Distance is 7,494.00 Parsecs or 24,442.68 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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135 Tauri Facts

Visual Facts


Primary / Proper / Traditional Name135 Tauri
Alternative NamesHD 39019, HIP 27581, HR 2016, 135 Tau, BD+14 1041
Spectral TypeG9III:
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationTaurus
Absolute Magnitude 0.63 / 0.60
Visual / Apparent Magnitude5.54
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 50m 28.90
Declination (Dec.)+14° 18` 20.5
Galactic Latitude-6.55 degrees
Galactic Longitude193.16 degrees
1997 Distance from Earth10.44 Parallax (milliarcseconds)
 312.42 Light Years
 95.79 Parsecs
2007 Distance from Earth10.30 Parallax (milliarcseconds)
 316.66 Light Years
 97.09 Parsecs
 20,026,110.49 Astronomical Units
Galacto-Centric Distance24,442.68 Light Years / 7,494.00 Parsecs
Proper Motion Dec.-37.53 ± 0.23 milliarcseconds/year
Proper Motion RA.7.27 ± 0.34 milliarcseconds/year
B-V Index1.00
Radial Velocity45.30 ± 0.70 km/s
Iron Abundance0.01 ± 0.06 Fe/H
Eccentricity0.15
Semi-Major Axis6850.00
Stellar Luminosity (Lsun)69.50

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature4,849 Kelvin

Sources and Links


SIMBAD SourceLink

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