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

Muscida (Omicron Ursae Majoris) Location in Ursa Major

Muscida (Omicron Ursae Majoris) is a white to yellow giant star that can be located in the constellation of Ursa Major. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. Muscida has at least 1 Extrasolar Planets believed to be in orbit around the star.

Muscida's Alternative Names

Omicron Ursae Majoris (Omi Uma) 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.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 1 Ursae Majoris with it shortened to 1 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+61 1054.

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

Location of Muscida

The location of the 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 star is compared to the celestial equator and is expressed in degrees. For Muscida, the location is 08h 30m 16.03 and +60° 43` 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. The Radial Velocity, that is the speed at which the star is moving away/towards us is 19.80000 km/s with an error of about 0.20 km/s .

Muscida Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 147.27 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature, Mass) of Muscida

Muscida has a spectral type of G4II-III. This means the star is a white to yellow giant star. The star is 7,441.00 Parsecs from the Galactic Centre or terms of Light Years is 24,269.81 s. 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. If you need the diameter of the star, you just need to multiple the radius by 2. 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.

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Muscida Facts

Visual Facts


Primary / Proper / Traditional NameMuscida
Alternative NamesOmicron Ursae Majoris, Omi Uma, HD 71369, HIP 41704, HR 3323, 1 Ursae Majoris, 1 UMa, BD+61 1054, 1 UMa, Omi Uma
Spectral TypeG4II-III
Multiple Star SystemYes
Star TypeGiant Star
Colour white to yellow
GalaxyMilky Way
ConstellationUrsa Major
Absolute Magnitude-0.40 / -0.35
Visual / Apparent Magnitude3.35
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)08h 30m 16.03
Declination (Dec.)+60° 43` 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 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
Eccentricity0.15
Semi-Major Axis7507.00
Stellar Luminosity (Lsun)147.27

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

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
B15.200001889
C11.000001888
D10.500001924

List of Extrasolar Planets orbiting Muscida


NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
omi UMa bConfirmed1630.00020123.92012.000

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