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Muscida, Omicron Ursae Majoris, 1 Ursae Majoris, HD71369, HIP41704, HR3323

Muscida (Omicron Ursae Majoris) is a white to yellow giant star that can be located in the constellation of UrsaMajor. Muscida 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.

Omicron Ursae Majoris is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR3323. HIP41704 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD71369.

Muscida has alternative name(s), 1 UMa, Omi Uma. Muscida has at least 1 Extrasolar Planets believed to be in orbit around the star.

Location of Muscida

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 Muscida, the location is 08h 30m 16.03 and +60d43`06.4 .

Proper Motion of Muscida

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 -107.45 ± 0.11 miliarcseconds/year towards the north and -133.76 ± 0.16 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Mass, Radius) of Muscida

Muscida has a spectral type of G4II-III. This means the star is a white to yellow giant star. The star is 7441.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24269.8144270400000000s. The star has a B-V Colour Index of 0.85 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,164 Kelvin.

Muscida Radius has been calculated as being 14.03 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,759,313.97.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 13.71. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 3.09 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is -0.090000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

Muscida Apparent and Absolute Magnitudes

Muscida has an apparent magnitude of 3.35 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 -0.40 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.35. 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 Muscida

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 17.76 which gave the calculated distance to Muscida as 183.65 light years away from Earth or 56.31 parsecs. It would take a spaceship travelling at the speed of light, 183.65 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 18.21 which put Muscida at a distance of 179.11 light years or 54.91 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 7,441.00 Parsecs or 24,269.81 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.

Muscida Facts

Alternative Names

Traditional/Proper NameMuscida
Flamsteed Name1 Ursae Majoris
Short Name1 UMa, Omi Uma
Bayer DesignationOmicron Ursae Majoris
Hipparcos Library I.D.41704
Yale Bright Star Catalogue (HR) Id3323
Bonner DurchmusterungBD+61 1054
Henry Draper Designation71369

Visual Facts

Star Typegiant star
Absolute Magnitude-0.40 / -0.35
Visual / Apparent Magnitude3.35
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 30m 16.03
Declination (Dec.)+60d43`06.4
Galactic Latitude35.43 degrees
Galactic Longitude155.98 degrees
1997 Distance from Earth17.76 Parallax (milliarcseconds)
 183.65 Light Years
 56.31 Parsecs
2007 Revised Distance from Earth18.21 Parallax (milliarcseconds)
 179.11 Light Years
 54.91 Parsecs
Galacto-Centric Distance24,269.81 Light Years / 7,441.00 Parsecs
Proper Motion Dec.-107.45 ± 0.11 milliarcseconds/year
Proper Motion RA.-133.76 ± 0.16 milliarcseconds/year
B-V Index0.85
Radial Velocity19.80 ± 0.20 km/s
Iron Abundance-0.11 ± 9.99 Fe/H
Spectral TypeG4II-III
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature5,164 Kelvin
Mass Compared to the Sun3.09

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
71369+61 1054.0A3.50000-131.00000-110.00000G0Yellow

Location of Muscida in Ursa Major

Muscida (Omicron Ursae Majoris) Location in Ursa Major

The map was generated using Night Vision, an awesome free application by Brian Simpson.

List of Extrasolar Planets orbiting Muscida

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastron
Omi Uma BConfirmed4.11630.00020123.9

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