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6 Ursae Majoris, HD75958, HIP43903, HR3531

6 Ursae Majoris is a white to yellow giant star that can be located in the constellation of UrsaMajor. 6 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 HR3531. HIP43903 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD75958.

Location of 6 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 6 Ursae Majoris, the location is 08h 56m 37.49 and +64d 36` 14.5 .

Proper Motion of 6 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 -82.94 ± 0.35 miliarcseconds/year towards the north and -32.45 ± 0.60 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 6 Ursae Majoris

6 Ursae Majoris has a spectral type of G6III. This means the star is a white to yellow giant star. The star is 7465.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24348.0936296000000000s. The star has a B-V Colour Index of 0.87 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,118 Kelvin.

6 Ursae Majoris Radius has been calculated as being 8.64 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 6,014,236.38.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 8.60. 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 -0.07 with an error value of 0.02 Fe/H with the Sun has a value of 1 to put it into context.

6 Ursae Majoris Apparent and Absolute Magnitudes

6 Ursae Majoris has an apparent magnitude of 5.57 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 0.69 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.70. 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 6 Ursae Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 10.59 which gave the calculated distance to 6 Ursae Majoris as 307.99 light years away from Earth or 94.43 parsecs. It would take a spaceship travelling at the speed of light, 307.99 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 10.63 which put 6 Ursae Majoris at a distance of 306.83 light years or 94.07 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 7,465.00 Parsecs or 24,348.09 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.

6 Ursae Majoris Facts

Alternative Names

Traditional/Proper Name6 Ursae Majoris
Flamsteed Name6 Ursae Majoris
Flamsteed Short Name6 UMa
Hipparcos Library I.D.43903
Yale Bright Star Catalogue (HR) Id3531
Bonner DurchmusterungBD+65 673
Henry Draper Designation75958

Visual Facts

Star Typegiant star
ConstellationUrsa Major
Absolute Magnitude0.69 / 0.70
Visual / Apparent Magnitude5.57
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 56m 37.49
Declination (Dec.)+64d 36` 14.5
Galactic Latitude37.60 degrees
Galactic Longitude150.48 degrees
1997 Distance from Earth10.59 Parallax (milliarcseconds)
 307.99 Light Years
 94.43 Parsecs
2007 Revised Distance from Earth10.63 Parallax (milliarcseconds)
 306.83 Light Years
 94.07 Parsecs
Galacto-Centric Distance24,348.09 Light Years / 7,465.00 Parsecs
Proper Motion Dec.-82.94 ± 0.35 milliarcseconds/year
Proper Motion RA.-32.45 ± 0.60 milliarcseconds/year
B-V Index0.87
Radial Velocity5.31 ± 0.05 km/s
Iron Abundance-0.07 ± 0.02 Fe/H
Spectral TypeG6III
Colour(G) White to Yellow

Estimated Facts

Calculated Effective Temperature5,118 Kelvin

Sources and Links

SIMBAD SourceLink

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