Universe Guide

R Tauri

R Tauri Facts

  • R Tauri is a pulsating star that can be located in the constellation of Taurus. The description is based on the spectral class.
  • R Tauri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M6.5-9e B) of the star, the star's colour is red .
  • The star is calculated at being about 657.52 light years away from us. Distance

R Tauri's Alternative Names

The Id of the star in the Henry Draper catalogue is HD28309.

R Tauri has alternative name(s) :- R 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 +09 585.

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

Location of R 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 R Tauri, the location is 04 28 18.0020756878 and +10 09 44.768248740 .

Radial Velocity and Proper Motion of R Tauri

Proper Motion

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 -0.54 milliarcseconds/year towards the north and -2.39 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 32.00000 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.

Physical Properties of R Tauri

R Tauri Colour and Temperature

Based on the star's spectral type of M6.5-9e B , R Tauri's colour and type is red star. Based on the star's spectral, the stars temperature is between 2,400.00 and 3,700.00 degrees kelvin.

Distance to R Tauri

The Parallax of the star is given as 4.96050 which gives a calculated distance to R Tauri of 657.52 light years from the Earth or 201.59 parsecs. It is about 3,865,313,755,375,687 miles from Earth.

The star is roughly 41,580,632.55 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.

Travel Time to R 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)
Airbus A380736 599,108,486.28
Speed of Sound (Mach 1)767.269574,692,638.31
Concorde (Mach 2)1,534.54287,345,944.65
New Horizons Probe33,00013,361,934.72
Speed of Light670,616,629.00657.52

Variable Type of R Tauri

The star is a pulsating Omicron Ceti 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.

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Additional R Tauri Facts and Figures

Visual Facts

Primary / Proper / Traditional NameR Tauri
Alternative NamesR Tau, HD 28309, BD +09 585
Spectral TypeM6.5-9e B
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
GalaxyMilky Way
Right Ascension (R.A.)04 28 18.0020756878
Declination (Dec.)+10 09 44.768248740
Distance from Earth4.96050 Parallax (milliarcseconds)
 657.52 Light Years
 201.59 Parsecs
 41,580,632.55 Astronomical Units
Proper Motion Dec.-0.53900 milliarcseconds/year
Proper Motion RA.-2.39200 milliarcseconds/year
Radial Velocity32.00000 km/s

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeOmicron Ceti

Estimated Calculated Facts

Calculated Temperature Range2,400.00 - 3,700.00

Sources and Links


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