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Thabit (Upsilon Orionis, 36 Orionis) Star Facts

Thabit Facts

  • Thabit is a main sequence star that can be located in the constellation of Orion. The description is based on the spectral class.
  • Thabit is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B0V) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 2861.08 light years away from us. Distance

Thabit's Alternative Names

Upsilon Orionis (Ups Ori) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR1855. HIP25923 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD36512.

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 36 Orionis. The Flamsteed name can be shortened to 36 Ori.

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-07 1106.

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

Location of Thabit

The location of the main sequence 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 Thabit, the location is 05h 31m 55.86 and -07° 18` 05.5 .

Radial Velocity and Proper Motion of Thabit

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 -4.87 ± 0.14 milliarcseconds/year towards the north and -0.10 ± 0.25 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 17.10000 km/s with an error of about 2.50 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 Thabit

Thabit Temperature and Colour

Based on the star's spectral type of B0V , Thabit's colour and type is blue main sequence star. The star has a B-V Colour Index of -0.26 which means the star's temperature is about 24,330 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Thabit Radius

Thabit estimated radius has been calculated as being 2.97 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,066,048.57.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 5.5038838129498682615805754118. 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.

Thabit Iron Abundance

Thabit Iron Abundance is 0.25 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

Thabit Apparent and Absolute Magnitudes

Thabit has an apparent magnitude of 4.62 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 -3.76 If you used the 2007 Parallax value, you would get an absolute magnitude of -5.10. 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 Thabit

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.11000 which gave the calculated distance to Thabit as 1545.80 light years away from Earth or 473.93 parsecs. If you want that in miles, it is about 9,087,179,101,867,224.34, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.14000 which put Thabit at a distance of 2861.08 light years or 877.19 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.

Using the 2007 distance, the star is roughly 180,932,164.64 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 Thabit

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)
Walking4479,671,956,224.83
Car12015,989,065,207.49
Airbus A3807362,606,912,805.57
Speed of Sound (Mach 1)767.2692,500,671,635.24
Concorde (Mach 2)1,534.541,250,334,188.03
New Horizons Probe33,00058,142,055.30
Speed of Light670,616,629.002,861.08

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 Thabit Facts and Figures

Visual Facts


Primary / Proper / Traditional NameThabit
Alternative NamesUpsilon Orionis, Ups Ori, HD 36512, HIP 25923, HR 1855, 36 Orionis, 36 Ori, BD-07 1106
Spectral TypeB0V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourBlue
GalaxyMilky Way
ConstellationOrion
Absolute Magnitude -3.76 / -5.10
Visual / Apparent Magnitude4.62
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 31m 55.86
Declination (Dec.)-07° 18` 05.5
Galactic Latitude-20.98303851 degrees
Galactic Longitude210.43561122 degrees
1997 Distance from Earth2.11000 Parallax (milliarcseconds)
 1545.80 Light Years
 473.93 Parsecs
2007 Distance from Earth1.14000 Parallax (milliarcseconds)
 2861.08 Light Years
 877.19 Parsecs
 180,932,164.64 Astronomical Units
Proper Motion Dec.-4.87000 ± 0.14000 milliarcseconds/year
Proper Motion RA.-0.10000 ± 0.25000 milliarcseconds/year
B-V Index-0.26
Radial Velocity17.10000 ± 2.50 km/s
Iron Abundance0.2500 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)5.50
Effective Temperature24,330 Kelvin

Sources and Links


SIMBAD SourceLink

Location of Thabit in Orion


Thabit Location in Orion

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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