Universe Guide

13 Orionis - HD33021 - HIP23852

13 Orionis is a white to yellow subgiant star that can be located in the constellation of Orion. HIP23852 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD33021. 13 Orionis has alternative name(s), 13 Orionis , 13 Ori.

Location of 13 Orionis

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 along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For 13 Orionis, the location is 05h 07m 38.32 and +09d28`21.8 .

Proper Motion of 13 Orionis

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 -381.56 ± 000.27 towards the north and -003.46 ± 000.45 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 13 Orionis

13 Orionis has a spectral type of G1IV. This means the star is a white to yellow coloured subgiant star. The star has a B-V Colour Index of 0.62 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,824 Kelvin.

13 Orionis has been calculated as 1.47 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,026,219.42.km.

13 Orionis Apparent and Absolute Magnitudes

13 Orionis has an apparent magnitude of 6.15 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 3.89 If you used the 2007 Parallax value, you would get an absolute magnitude of 3.94. 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 13 Orionis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 35.34 which gave the calculated distance to 13 Orionis as 92.29 light years away from Earth or 28.30 parsecs. In 2007, Hipparcos data was revised with a new parallax of 36.14 which put 13 Orionis at a distance of 90.25 light years or 27.67 parsecs.

It would take a spaceship travelling at the speed of light, 92.29 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

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.

13 Orionis Facts


Traditional Name13 Orionis
Short Name13 Ori
Alternative Name(s)13 Orionis
Hipparcos Library I.D.23852
Bonner DurchmusterungBD+09 736
Henry Draper Designation33021
Celestial TypeStar
Absolute Magnitude3.89 / 3.94
Apparent Magnitude6.15
Right Ascension (R.A.)05h 07m 38.32
Declination (Dec.)+09d28`21.8
1997 Distance from Earth35.34 Parallax (milliarcseconds)
 92.29 Light Years
 28.30 Parsecs
2007 Distance from Earth36.14 Parallax (milliarcseconds)
 90.25 Light Years
 27.67 Parsecs
Proper Motion Dec.-381.56 ± 0.27 milliarcseconds/year
Proper Motion RA.-3.46 ± 0.45 milliarcseconds/year
B-V Index0.62
Spectral TypeG1IV
Colour(G) White to Yellow
Star Typesubgiant star
Radius (x the Sun)1.47
Calculated Effective Temperature5,824 Kelvin


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