Universe Guide

11 Orionis - HD32549 - HIP23607

11 Orionis is a blue rotating that can be located in the constellation of Orion. HIP23607 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32549. 11 Orionis has alternative name(s), 11 Orionis , V1032_Ori, 11 Ori.

Location of 11 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 11 Orionis, the location is 05h 04m 34.14 and +15 d 24 ` 15.1 .

Proper Motion of 11 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 -031.00 ± 000.00 towards the north and 018.00 ± 000.00 east if we saw them in the horizon.

11 Orionis 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 50600.0000000 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 11 Orionis

11 Orionis has a spectral type of A0p Si. This means the star is a blue coloured . The star has a B-V Colour Index of -0.06 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,136 Kelvin.

11 Orionis has been calculated as 3.10 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,153,995.76.km.

11 Orionis Apparent and Absolute Magnitudes

11 Orionis has an apparent magnitude of 4.65 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 -0.83 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.58. 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 11 Orionis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.00 which gave the calculated distance to 11 Orionis as 407.70 light years away from Earth or 125 parsecs. In 2007, Hipparcos data was revised with a new parallax of 9.00 which put 11 Orionis at a distance of 362.40 light years or 111.11 parsecs.

It would take a spaceship travelling at the speed of light, 407.70 years using the 1997 distance to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of 11 Orionis

The star is a rotating Alpha2 Canum Venaticorum 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. 11 Orionis brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 5.0 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

11 Orionis Facts


Traditional Name11 Orionis
Short NameV1032 Ori, 11 Ori
Alternative Name(s)11 Orionis
Hipparcos Library I.D.23607
Bonner DurchmusterungBD+15 732
Henry Draper Designation32549
Celestial TypeStar
Absolute Magnitude-0.83 / -0.58
Apparent Magnitude4.65
Right Ascension (R.A.)05h 04m 34.14
Declination (Dec.)+15 d 24 ` 15.1
1997 Distance from Earth8.00 Parallax (milliarcseconds)
 407.70 Light Years
 125 Parsecs
2007 Distance from Earth9.00 Parallax (milliarcseconds)
 362.40 Light Years
 111.11 Parsecs
Proper Motion Dec.-31.00 ± 0.00 milliarcseconds/year
Proper Motion RA.18.00 ± 0.00 milliarcseconds/year
B-V Index-0.06
Spectral TypeA0p Si
Colour(A) blue
Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days5.000
Radius (x the Sun)3.10
Luminosity (x the Sun)50,600.0000000
Calculated Effective Temperature12,136 Kelvin


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