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83 Ursae Majoris, HD119228, HIP66738, HR5154

83 Ursae Majoris is a red giant star that can be located in the constellation of UrsaMajor. 83 Ursae Majoris is the brightest star in Ursa Major based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

The Id of the star in the Yale Bright Star Catalogue is HR5154. HIP66738 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD119228.

83 Ursae Majoris has alternative name(s), IQ UMa.

Location of 83 Ursae Majoris

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 Ursae Majoris, the location is 13h 40m 44.29 and +54d 40` 54.0 .

Proper Motion of 83 Ursae Majoris

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 -10.56 ± 0.18 miliarcseconds/year towards the north and -19.06 ± 0.22 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 83 Ursae Majoris

83 Ursae Majoris has a spectral type of M2IIIvar. This means the star is a red giant star. The star is 7426.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24220.8899254400000000s. The star has a B-V Colour Index of 1.63 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,700 Kelvin.

83 Ursae Majoris Radius has been calculated as being 45.34 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 31,549,981.46.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 43.30. 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 0.30 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

83 Ursae Majoris Apparent and Absolute Magnitudes

83 Ursae Majoris has an apparent magnitude of 4.63 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 -1.50 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.40. 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 Ursae Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.94 which gave the calculated distance to 83 Ursae Majoris as 549.10 light years away from Earth or 168.35 parsecs. It would take a spaceship travelling at the speed of light, 549.10 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 6.23 which put 83 Ursae Majoris at a distance of 523.54 light years or 160.51 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 7,426.00 Parsecs or 24,220.89 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. 83 Ursae Majoris brightness ranges from a magnitude of 4.750 to a magnitude of 4.692 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

83 Ursae Majoris Facts

Alternative Names

Traditional/Proper Name83 Ursae Majoris
Flamsteed Name83 Ursae Majoris
Flamsteed Short Name83 UMa
Short NameIQ UMa
Hipparcos Library I.D.66738
Yale Bright Star Catalogue (HR) Id5154
Bonner DurchmusterungBD+55 1625
Henry Draper Designation119228

Visual Facts

Star Typegiant star
ConstellationUrsa Major
Absolute Magnitude-1.50 / -1.40
Visual / Apparent Magnitude4.63
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 40m 44.29
Declination (Dec.)+54d 40` 54.0
Galactic Latitude61.01 degrees
Galactic Longitude108.18 degrees
1997 Distance from Earth5.94 Parallax (milliarcseconds)
 549.10 Light Years
 168.35 Parsecs
2007 Revised Distance from Earth6.23 Parallax (milliarcseconds)
 523.54 Light Years
 160.51 Parsecs
Galacto-Centric Distance24,220.89 Light Years / 7,426.00 Parsecs
Proper Motion Dec.-10.56 ± 0.18 milliarcseconds/year
Proper Motion RA.-19.06 ± 0.22 milliarcseconds/year
B-V Index1.63
Radial Velocity-18.61 ± 0.20 km/s
Iron Abundance0.30 ± 9.99 Fe/H
Spectral TypeM2IIIvar
Colour(M) Red

Variable Star Details

Mean Variability Period in Days0.046
Variable Magnitude Range (Brighter - Dimmer)4.692 - 4.750

Estimated Facts

Calculated Effective Temperature3,700 Kelvin

Sources and Links

SIMBAD SourceLink

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