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Muscida (Omicron 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. 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 Ursae Majoris , 1 UMa.

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 ± 000.11 towards the north and -133.76 ± 000.16 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 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 has been calculated as 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. The star's solar mass is 3.00 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.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Muscida Facts

Alternative Names

Traditional NameMuscida
Short Name1 UMa
Bayer DesignationOmicron Ursae Majoris
Alternative Name(s)1 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
Apparent Magnitude3.35
Right Ascension (R.A.)08h 30m 16.03
Declination (Dec.)+60d43`06.4
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
Proper Motion Dec.-107.45 ± 0.11 milliarcseconds/year
Proper Motion RA.-133.76 ± 0.16 milliarcseconds/year
B-V Index0.85
Spectral TypeG4II-III
Colour(G) White to Yellow

Estimated Facts

Radius (x the Sun)14.03
Calculated Effective Temperature5,164 Kelvin
Mass Compared to the Sun3.00

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.

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