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127 Tauri

127 Tauri Facts

  • 127 Tauri is a star that can be located in the constellation of Taurus. The description is based on the spectral class.
  • 127 Tauri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B9) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 360.00 light years away from us. Distance

127 Tauri's Alternative Names

HIP26925 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD37940.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 127 Tauri. The Flamsteed name can be shortened to 127 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+18 923.

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

Location of 127 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 object is compared to the celestial equator and is expressed in degrees. For 127 Tauri, the location is 05h 42m 53.68 and +18° 58` 49.4 .

Proper Motion of 127 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 -11.03 ± 0.35 milliarcseconds/year towards the north and -6.51 ± 0.54 milliarcseconds/year east if we saw them in the horizon. . 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.

Physical Properties of 127 Tauri

127 Tauri Temperature and Colour

Based on the star's spectral type of B9 , 127 Tauri's colour and type is blue star. The star has a B-V Colour Index of -0.01 which means the star's temperature is about 10,551 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

127 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 27.32 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

127 Tauri Radius

127 Tauri estimated radius has been calculated as being 1.55 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,078,420.21.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 1.4331839116753742310710722762. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

127 Tauri Apparent and Absolute Magnitudes

127 Tauri has an apparent magnitude of 6.66 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 1.28 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.45. 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 127 Tauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.40000 which gave the calculated distance to 127 Tauri as 388.29 light years away from Earth or 119.05 parsecs. If you want that in miles, it is about 2,282,611,446,153,463.93, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 9.06000 which put 127 Tauri at a distance of 360.00 light years or 110.38 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 22,767,350.67 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 7,508.00 Parsecs or 24,488.34 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to 127 Tauri

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking460,355,496,610.00
Car1202,011,849,887.00
Airbus A380736328,019,003.32
Speed of Sound (Mach 1)767.269314,651,036.91
Concorde (Mach 2)1,534.54157,325,313.41
New Horizons Probe33,0007,315,817.77
Speed of Light670,616,629.00360.00

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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Additional 127 Tauri Facts and Figures

Visual Facts


Primary / Proper / Traditional Name127 Tauri
Alternative NamesHD 37940, HIP 26925, 127 Tau, BD+18 923
Spectral TypeB9
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeStar
ColourBlue
GalaxyMilky Way
ConstellationTaurus
Absolute Magnitude 1.28 / 1.45
Visual / Apparent Magnitude6.66
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 42m 53.68
Declination (Dec.)+18° 58` 49.4
Galactic Latitude-5.71964167 degrees
Galactic Longitude188.18611751 degrees
1997 Distance from Earth8.40000 Parallax (milliarcseconds)
 388.29 Light Years
 119.05 Parsecs
2007 Distance from Earth9.06000 Parallax (milliarcseconds)
 360.00 Light Years
 110.38 Parsecs
 22,767,350.67 Astronomical Units
Galacto-Centric Distance24,488.34 Light Years / 7,508.00 Parsecs
Proper Motion Dec.-11.03000 ± 0.35000 milliarcseconds/year
Proper Motion RA.-6.51000 ± 0.54000 milliarcseconds/year
B-V Index-0.01
Stellar Luminosity (Lsun)27.3200000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)1.43
Effective Temperature10,551 Kelvin

Sources and Links


SIMBAD SourceLink

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
37940+18 923.0A6.80000-10.00000-5.00000B9Blue/White
B10.100001906

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