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Muscida (Omicron Ursae Majoris, 1 Ursae Majoris) Star Facts

Muscida Facts

  • Muscida is a giant star that can be located in the constellation of Ursa Major. The description is based on the spectral class.
  • Muscida is a main star of the constellation outline.
  • Based on the spectral type (G4II-III) of the star, the star's colour is yellow .
  • 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 179.11 light years away from us. Distance

Muscida's Alternative Names

Omicron Ursae Majoris (Omi Uma) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

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 named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 1 Ursae Majoris. The Flamsteed name can be 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 objects' alternative names can be found at Star Names .

Location of Muscida

The location of the giant 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 Muscida, the location is 08h 30m 16.03 and +60° 43` 06.4 .

Radial Velocity and Proper Motion of Muscida

Proper Motion

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

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 19.80000 km/s with an error of about 0.20 km/s . 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 of Muscida

Muscida Colour and Temperature

Based on the star's spectral type of G4II-III , Muscida's colour and type is yellow giant star. The star has a B-V Colour Index of 0.85 which means the star's temperature is about 5,164 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

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.

Muscida Radius

Muscida estimated 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 13.70674631012306119257110868. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

Muscida Mass

The Muscida's solar mass is 3.09 times that of our star, the Sun. 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.

Muscida Metalicity

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 17.76000 which gave the calculated distance to Muscida as 183.65 light years away from Earth or 56.31 parsecs. If you want that in miles, it is about 1,079,609,549,785,169.98, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 18.21000 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.

Using the 2007 distance, the star is roughly 11,325,921.59 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. 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*.

Travel Time to Muscida

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking430,028,536,105.05
Car1201,000,951,203.50
Airbus A380736163,198,565.79
Speed of Sound (Mach 1)767.269156,547,631.17
Concorde (Mach 2)1,534.5478,273,713.57
New Horizons Probe33,0003,639,822.56
Speed of Light670,616,629.00179.11

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 Muscida Facts and Figures

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
Constellation's Main StarYes
Multiple Star SystemYes
Star TypeGiant Star
ColourYellow
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 Latitude35.42712906 degrees
Galactic Longitude155.97603139 degrees
1997 Distance from Earth17.76000 Parallax (milliarcseconds)
 183.65 Light Years
 56.31 Parsecs
2007 Distance from Earth18.21000 Parallax (milliarcseconds)
 179.11 Light Years
 54.91 Parsecs
 11,325,921.59 Astronomical Units
Galacto-Centric Distance24,269.81 Light Years / 7,441.00 Parsecs
Proper Motion Dec.-107.45000 ± 0.11000 milliarcseconds/year
Proper Motion RA.-133.76000 ± 0.16000 milliarcseconds/year
B-V Index0.85
Radial Velocity19.80000 ± 0.20 km/s
Iron Abundance-0.1100 ± 9.99 Fe/H
Eccentricity0.14680
Semi-Major Axis7507.0000000
Stellar Luminosity (Lsun)147.2700000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet Count1

Estimated Calculated Facts


Radius (x the Sun)13.71
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

Location of Muscida in Ursa Major


Muscida 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 bConfirmed1630.00020123.9

Ursa Major Main Stars


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