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30 Orionis

30 Orionis Facts

30 Orionis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR1811. HIP25473 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD35715.

30 Orionis has alternative name(s) :- , psi Ori.

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 30 Orionis with it shortened to 30 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+02 962.

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

Location of 30 Orionis

The location of the subgiant 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 30 Orionis, the location is 05h 26m 50.23 and +03° 05` 44.4 .

Radial Velocity and Proper Motion of 30 Orionis

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 -1.94 ± 0.27 miliarcseconds/year towards the north and 1.71 ± 0.68 miliarcseconds/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 25.40 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 (Colour, Temperature) of 30 Orionis

30 Orionis Colour and Temperature

30 Orionis has a spectral type of B2IV. This means the star is a blue subgiant star. The star has a B-V Colour Index of -0.19 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 16,152 Kelvin.

30 Orionis Radius

Radius has been calculated as being 6.26 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 4,354,823.54.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 5.02. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

30 Orionis Apparent and Absolute Magnitudes

30 Orionis has an apparent magnitude of 4.59 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 -3.60 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.12. 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 30 Orionis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.30 which gave the calculated distance to 30 Orionis as 1418.10 light years away from Earth or 434.78 parsecs. It would take a spaceship travelling at the speed of light, 1418.10 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 2.87 which put 30 Orionis at a distance of 1136.46 light years or 348.43 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 71,868,345.66 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.

Variable Type of 30 Orionis

The star is a eclipsing binary sys Beta Lyrae (Sheliak) 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. 30 Orionis brightness ranges from a magnitude of 4.537 to a magnitude of 4.499 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.5 days (variability).

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 30 Orionis Facts and Figures

Visual Facts


Primary / Proper / Traditional Name30 Orionis
Alternative NamesPsi Ori, HD 35715, HIP 25473, HR 1811, 30 Ori, BD+02 962, psi Ori
Spectral TypeB2IV
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeSubgiant Star
ColourBlue
GalaxyMilky Way
ConstellationOrion
Absolute Magnitude -3.60 / -3.12
Visual / Apparent Magnitude4.59
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)05h 26m 50.23
Declination (Dec.)+03° 05` 44.4
Galactic Latitude-17.22 degrees
Galactic Longitude200.09 degrees
1997 Distance from Earth2.30 Parallax (milliarcseconds)
 1418.10 Light Years
 434.78 Parsecs
2007 Distance from Earth2.87 Parallax (milliarcseconds)
 1136.46 Light Years
 348.43 Parsecs
 71,868,345.66 Astronomical Units
Proper Motion Dec.-1.94 ± 0.27 milliarcseconds/year
Proper Motion RA.1.71 ± 0.68 milliarcseconds/year
B-V Index-0.19
Radial Velocity25.40 ± 2.50 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Lyrae (Sheliak)
Mean Variability Period in Days2.526
Variable Magnitude Range (Brighter - Dimmer)4.499 - 4.537

Estimated Calculated Facts


Radius (x the Sun)5.02
Effective Temperature16,152 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
35715+02 962.0A4.70000-2.00000-3.00000B2Blue/White
B10.300001864
C12.300001912

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