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VX Ursae Minoris, HD155154, HIP83317

VX Ursae Minoris is a blue to white subgiant star that can be located in the constellation of UrsaMinor. VX Ursae Minoris is the brightest star in Ursa Minor 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.

HIP83317 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD155154.

VX Ursae Minoris has alternative name(s), NSV 08183.

Location of VX Ursae Minoris

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 VX Ursae Minoris, the location is 17h 01m 40.08 and +75d 17` 51.6 .

Proper Motion of VX Ursae Minoris

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 -69.85 ± 0.23 miliarcseconds/year towards the north and 14.41 ± 0.23 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of VX Ursae Minoris

VX Ursae Minoris has a spectral type of F0IVn. This means the star is a blue to white subgiant star. The star is 7412.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24175.2270572800000000s. The star has a B-V Colour Index of 0.3 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 7,218 Kelvin.

VX Ursae Minoris Radius has been calculated as being 1.56 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,087,741.02.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.62. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

VX Ursae Minoris Apparent and Absolute Magnitudes

VX Ursae Minoris has an apparent magnitude of 6.17 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 2.91 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.83. 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 VX Ursae Minoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 22.26 which gave the calculated distance to VX Ursae Minoris as 146.52 light years away from Earth or 44.92 parsecs. It would take a spaceship travelling at the speed of light, 146.52 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 21.46 which put VX Ursae Minoris at a distance of 151.99 light years or 46.60 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 7,412.00 Parsecs or 24,175.23 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. VX Ursae Minoris brightness ranges from a magnitude of 6.267 to a magnitude of 6.233 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.

VX Ursae Minoris Facts

Alternative Names

Traditional/Proper NameVX Ursae Minoris
Short NameNSV 08183
Hipparcos Library I.D.83317
Bonner DurchmusterungBD+75 613
Henry Draper Designation155154

Visual Facts

Star Typesubgiant star
ConstellationUrsa Minor
Absolute Magnitude2.91 / 2.83
Visual / Apparent Magnitude6.17
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 01m 40.08
Declination (Dec.)+75d 17` 51.6
Galactic Latitude33.03 degrees
Galactic Longitude107.35 degrees
1997 Distance from Earth22.26 Parallax (milliarcseconds)
 146.52 Light Years
 44.92 Parsecs
2007 Revised Distance from Earth21.46 Parallax (milliarcseconds)
 151.99 Light Years
 46.60 Parsecs
Galacto-Centric Distance24,175.23 Light Years / 7,412.00 Parsecs
Proper Motion Dec.-69.85 ± 0.23 milliarcseconds/year
Proper Motion RA.14.41 ± 0.23 milliarcseconds/year
B-V Index0.30
Radial Velocity1.00 ± 7.40 km/s
Spectral TypeF0IVn
Colour(F) blue to white

Variable Star Details

Mean Variability Period in Days0.022
Variable Magnitude Range (Brighter - Dimmer)6.233 - 6.267

Estimated Facts

Calculated Effective Temperature7,218 Kelvin

Sources and Links

SIMBAD SourceLink

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