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FS Ursae Majoris

FS Ursae Majoris Facts

FS Ursae Majoris's Alternative Names

HIP43515 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD75371.

FS Ursae Majoris has alternative name(s) :- , FS UMa.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD+53 1286.

More details on objects' alternative names can be found at Star Names .

Location of FS Ursae Majoris

The location of the variable star in the night sky 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 object is compared to the celestial equator and is expressed in degrees. For FS Ursae Majoris, the location is 08h 51m 46.35 and +52° 30` 52.1 .

Proper Motion of FS 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 -6.58 ± 0.93 miliarcseconds/year towards the north and -10.06 ± 1.50 miliarcseconds/year east if we saw them in the horizon. . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties (Colour, Temperature) of FS Ursae Majoris

FS Ursae Majoris has a spectral type of M.... This means the star is a red variable star. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,993 Kelvin.

FS Ursae Majoris Apparent and Absolute Magnitudes

FS Ursae Majoris has an apparent magnitude of 9.24 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.92. 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 FS Ursae Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.22 which gave the calculated distance to FS Ursae Majoris as -14825.61 light years away from Earth or -4545.45 parsecs. It would take a spaceship travelling at the speed of light, -14825.61 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 0.93 which put FS Ursae Majoris at a distance of 3507.13 light years or 1075.27 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.

Using the 2007 distance, the star is roughly 221,788,812.77 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. FS Ursae Majoris brightness ranges from a magnitude of 9.364 to a magnitude of 9.165 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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.

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Additional FS Ursae Majoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameFS Ursae Majoris
Alternative NamesHD 75371, HIP 43515, BD+53 1286, FS UMa
Spectral TypeM...
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationUrsa Major
Absolute Magnitude / -0.92
Visual / Apparent Magnitude9.24
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)08h 51m 46.35
Declination (Dec.)+52° 30` 52.1
Galactic Latitude39.30 degrees
Galactic Longitude165.81 degrees
1997 Distance from Earth-0.22 Parallax (milliarcseconds)
 -14825.61 Light Years
 -4545.45 Parsecs
2007 Distance from Earth0.93 Parallax (milliarcseconds)
 3507.13 Light Years
 1075.27 Parsecs
 221,788,812.77 Astronomical Units
Proper Motion Dec.-6.58 ± 0.93 milliarcseconds/year
Proper Motion RA.-10.06 ± 1.50 milliarcseconds/year
B-V Index1.51

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.143
Variable Magnitude Range (Brighter - Dimmer)9.165 - 9.364

Estimated Calculated Facts


Effective Temperature3,993 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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