Universe Guide

HomeFactsConstellationsLeo

83 Leonis B - HD99491 - HIP55846

83 Leonis B is a orange to red subgiant star that can be located in the constellation of Leo. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP55846 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD99491. The Id of the star in the Gould Star Catalogue is 57. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. The Gliese ID of the star is Gliese GL429A. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Ref : Star Names.

83 Leonis B has alternative name(s), 83 Leonis , 83 Leo. 83 Leonis B is a multiple star system with 2 stars orbiting in its solar system.

Location of 83 Leonis B

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 B, the location is 11h 26m 45.75 and +03d00`45.6 .

Proper Motion of 83 Leonis B

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 180.67 ± 0.56 miliarcseconds/year towards the north and -725.74 ± 0.75 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 83 Leonis B

83 Leonis B has a spectral type of K0IV. This means the star is a orange to red subgiant star. The star is 7402.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24142.6107228800000000s. The star has a B-V Colour Index of 0.77 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,364 Kelvin.

83 Leonis B Radius has been calculated as being 0.96 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 670,438.20.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 0.97. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.31 with an error value of 0.01 Fe/H with the Sun has a value of 1 to put it into context.

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

83 Leonis B Apparent and Absolute Magnitudes

83 Leonis B has an apparent magnitude of 6.49 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 5.25 If you used the 2007 Parallax value, you would get an absolute magnitude of 5.24. 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 B

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 56.59 which gave the calculated distance to 83 Leonis B as 57.64 light years away from Earth or 17.67 parsecs. It would take a spaceship travelling at the speed of light, 57.64 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 56.35 which put 83 Leonis B at a distance of 57.88 light years or 17.75 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.

The star's Galacto-Centric Distance is 7,402.00 Parsecs or 24,142.61 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

83 Leonis B Facts

Alternative Names

Traditional/Proper Name83 Leonis B
Short Name83 Leo
Alternative Name(s)83 Leonis
Hipparcos Library I.D.55846
Bonner DurchmusterungBDD+03 2502
Gould I.D.57
Gliese ID429A
Henry Draper Designation99491

Visual Facts

Star Typesubgiant star
Absolute Magnitude5.25 / 5.24
Visual / Apparent Magnitude6.49
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)11h 26m 45.75
Declination (Dec.)+03d00`45.6
Galactic Latitude58.51 degrees
Galactic Longitude259.27 degrees
1997 Distance from Earth56.59 Parallax (milliarcseconds)
 57.64 Light Years
 17.67 Parsecs
2007 Revised Distance from Earth56.35 Parallax (milliarcseconds)
 57.88 Light Years
 17.75 Parsecs
Galacto-Centric Distance24,142.61 Light Years / 7,402.00 Parsecs
Proper Motion Dec.180.67 ± 0.56 milliarcseconds/year
Proper Motion RA.-725.74 ± 0.75 milliarcseconds/year
B-V Index0.77
Radial Velocity4.16 ± 0.09 km/s
Iron Abundance0.31 ± 0.01 Fe/H
Spectral TypeK0IV
Colour(K) Orange to Red

Companions (Multi-Star and Exoplanets) Facts

Stars in Solar System2
Companion Stars83 Leonis

Estimated Facts

Calculated Effective Temperature5,364 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars


Add a Comment


Name:
Email: (Optional)
Comment: