Universe Guide


83 Leonis - HD99492 - HIP55848

83 Leonis is a orange to red main sequence dwarf star that can be located in the constellation of Leo. It is calculated at being 4.000 Billion Years old. This information comes from ExoPlanet. HIP55848 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD99492. 83 Leonis has alternative name(s), 83 Leonis , 83 Leo. 83 Leonis is a multiple star system with 2 stars orbiting in its solar system.

Location of 83 Leonis

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 83 Leonis, the location is 11h 26m 46.70 and +03d00`21.1 .

Proper Motion of 83 Leonis

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 188.97 ± 001.07 towards the north and -730.81 ± 001.46 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Metallicity, Age, Mass, Radius) of 83 Leonis

83 Leonis has a spectral type of K2V. This means the star is a orange to red main sequence dwarf star. The star has a B-V Colour Index of 1 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,849 Kelvin.

83 Leonis has been calculated as 0.73 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 505,849.83.km. The star's solar mass is 1.00 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.360000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

The star is believed to be about 4.00 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, 83 Leonis B.

83 Leonis Apparent and Absolute Magnitudes

83 Leonis has an apparent magnitude of 7.58 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 6.30 If you used the 2007 Parallax value, you would get an absolute magnitude of 6.31. 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 83 Leonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 55.59 which gave the calculated distance to 83 Leonis as 58.67 light years away from Earth or 17.99 parsecs. It would take a spaceship travelling at the speed of light, 58.67 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 55.69 which put 83 Leonis at a distance of 58.57 light years or 17.96 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.

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.

83 Leonis Facts

Alternative Names

Traditional Name83 Leonis
Short Name83 Leo
Alternative Name(s)83 Leonis
Hipparcos Library I.D.55848
Bonner DurchmusterungBD+03 2503
Henry Draper Designation99492

Visual Facts

Star Typemain sequence dwarf star
Age4.000 Billions of Years
Absolute Magnitude6.30 / 6.31
Apparent Magnitude7.58
Right Ascension (R.A.)11h 26m 46.70
Declination (Dec.)+03d00`21.1
1997 Distance from Earth55.59 Parallax (milliarcseconds)
 58.67 Light Years
 17.99 Parsecs
2007 Revised Distance from Earth55.69 Parallax (milliarcseconds)
 58.57 Light Years
 17.96 Parsecs
Proper Motion Dec.188.97 ± 1.07 milliarcseconds/year
Proper Motion RA.-730.81 ± 1.46 milliarcseconds/year
B-V Index1.00
Spectral TypeK2V
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Stars in Solar System2
Companion Stars83 Leonis B

Estimated Facts

Radius (x the Sun)0.73
Calculated Effective Temperature4,849 Kelvin
Mass Compared to the Sun1.00

Sources and Links

SIMBAD SourceLink

Related Stars

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
99492+03 2503.0B7.90000-715.00000181.00000K0Orange1958

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