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Tania Australis (Mu Ursae Majoris, 34 Ursae Majoris) Star Facts

Tania Australis Facts

  • Tania Australis is a pulsating giant star that can be located in the constellation of Ursa Major. The description is based on the spectral class.
  • Tania Australis is a main star of the constellation outline.
  • Based on the spectral type (M0III SB) of the star, the star's colour is red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • It is calculated at being 4.604 Billion Years old. This information comes from ExoPlanet.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 230.34 light years away from us. Distance

Tania Australis's Alternative Names

Mu Ursae Majoris (Mu. 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 HR4069. HIP50801 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD89758.

Tania Australis has alternative name(s) :- Mu UMa, NSV 04829. In Arabic, it is known as Ath-Thaniyah.

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 34 Ursae Majoris. The Flamsteed name can be shortened to 34 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+42 2115.

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

Location of Tania Australis

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 Tania Australis, the location is 10h 22m 19.80 and +41° 29` 58.0 .

Radial Velocity and Proper Motion of Tania Australis

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 35.34 ± 0.34 milliarcseconds/year towards the north and -81.47 ± 0.54 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 -22.15000 km/s with an error of about 3.58 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 Tania Australis

Tania Australis Colour and Temperature

Based on the star's spectral type of M0III SB , Tania Australis's colour and type is red giant star. The star has a B-V Colour Index of 1.6 which means the star's temperature is about 3,779 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

Tania Australis Radius

Tania Australis estimated radius has been calculated as being 40.57 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 28,225,867.60.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 37.511221508174599612658337281. 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.

Tania Australis Mass

The Tania Australis's solar mass is 1.23 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.

Tania Australis Metalicity

The star's metallicity is -0.250000, 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.

Tania Australis Estimated Age

The star is believed to be about 4.60 Billion years old. To put in context, the Sun is believed to be about five billion years old and the Universe is about 13.8 billion years old.

Tania Australis Apparent and Absolute Magnitudes

Tania Australis has an apparent magnitude of 3.06 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 -1.35 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.18. 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 Tania Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 13.11000 which gave the calculated distance to Tania Australis as 248.79 light years away from Earth or 76.28 parsecs. If you want that in miles, it is about 1,462,543,206,594,350.33, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 14.16000 which put Tania Australis at a distance of 230.34 light years or 70.62 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 14,566,319.12 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 7,439.00 Parsecs or 24,263.29 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 Tania Australis

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)
Walking438,617,458,580.97
Car1201,287,248,619.37
Airbus A380736209,877,492.29
Speed of Sound (Mach 1)767.269201,324,221.78
Concorde (Mach 2)1,534.54100,661,979.70
New Horizons Probe33,0004,680,904.07
Speed of Light670,616,629.00230.34

Variable Type of Tania Australis

The star is a pulsating Semi-Regular Star w variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. Tania Australis brightness ranges from a magnitude of 3.186 to a magnitude of 3.123 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 Tania Australis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameTania Australis
Alternative NamesMu Ursae Majoris, Mu. Uma, Mu UMa, Ath-Thaniyah, HD 89758, HIP 50801, HR 4069, 34 Ursae Majoris, 34 Uma, BD+42 2115, NSV 04829
Spectral TypeM0III SB
Constellation's Main StarYes
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationUrsa Major
Age4.60 Billion Years Old
Absolute Magnitude -1.35 / -1.18
Visual / Apparent Magnitude3.06
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)10h 22m 19.80
Declination (Dec.)+41° 29` 58.0
Galactic Latitude56.36052015 degrees
Galactic Longitude177.90326993 degrees
1997 Distance from Earth13.11000 Parallax (milliarcseconds)
 248.79 Light Years
 76.28 Parsecs
2007 Distance from Earth14.16000 Parallax (milliarcseconds)
 230.34 Light Years
 70.62 Parsecs
 14,566,319.12 Astronomical Units
Galacto-Centric Distance24,263.29 Light Years / 7,439.00 Parsecs
Proper Motion Dec.35.34000 ± 0.34000 milliarcseconds/year
Proper Motion RA.-81.47000 ± 0.54000 milliarcseconds/year
B-V Index1.6
Radial Velocity-22.15000 ± 3.58 km/s
Iron Abundance-0.0400 ± 9.99 Fe/H
Eccentricity0.22560
Semi-Major Axis9356.0000000

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.048
Variable Magnitude Range (Brighter - Dimmer)3.123 - 3.186

Estimated Calculated Facts


Radius (x the Sun)37.51
Effective Temperature3,779 Kelvin
Mass Compared to the Sun1.23

Sources and Links


SIMBAD SourceLink

Location of Tania Australis in Ursa Major


Tania Australis Location in Ursa Major

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

Ursa Major Main Stars


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