Universe Guide

101 Tauri - HD31845 - HIP23214

101 Tauri is a blue to white main sequence dwarf star that can be located in the constellation of Taurus. HIP23214 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD31845. 101 Tauri has alternative name(s), 101 Tauri , 101 Tau.

Location of 101 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 from celestial equator. The Declination is how up or down compared to the celestial equator and is expressed in degrees. For 101 Tauri, the location is 04h 59m 44.27 and +15 d 55 ` 00.5 .

Proper Motion of 101 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 -030.00 ± 000.00 towards the north and 086.00 ± 000.00 east if we saw them in the horizon.

101 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 3.0000000 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 101 Tauri

101 Tauri has a spectral type of F5V. This means the star is a blue to white coloured main sequence dwarf star. The star has a B-V Colour Index of 0.45 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,500 Kelvin.

101 Tauri has been calculated as 1.43 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 994,319.98.km.

101 Tauri Apparent and Absolute Magnitudes

101 Tauri has an apparent magnitude of 6.75 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 3.56 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.74. 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 101 Tauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 23.00 which gave the calculated distance to 101 Tauri as 141.81 light years away from us or 43.48 parsecs. In 2007, Hipparcos data was revised with a new parallax of 25.00 which put 101 Tauri at a distance of 130.47 light years or 40 parsecs.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

101 Tauri Facts


Traditional Name101 Tauri
Short Name101 Tau
Alternative Name(s)101 Tauri
Hipparcos Library I.D.23214
Henry Draper Designation31845
Celestial TypeStar
Absolute Magnitude3.56 / 3.74
Apparent Magnitude6.75
Right Ascension (R.A.)04h 59m 44.27
Declination (Dec.)+15 d 55 ` 00.5
1997 Distance23.00 Parallax (milliarcseconds)
 141.81 Light Years
 43.48 Parsecs
2007 Distance25.00 Parallax (milliarcseconds)
 130.47 Light Years
 40 Parsecs
Proper Motion Dec.-30.00 ± 0.00 milliarcseconds/year
Proper Motion RA.86.00 ± 0.00 milliarcseconds/year
B-V Index0.45
Spectral TypeF5V
Colour(F) blue to white
Star Typemain sequence dwarf star
Radius (x the Sun)1.43
Luminosity (x the Sun)3.0000000
Calculated Effective Temperature6,500 Kelvin


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