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Tania Australis, Mu Ursae Majoris, 34 Ursae Majoris, HD89758, HIP50801, HR4069

Tania Australis Location in Ursa Major

Primary Facts on Tania Australis

  • Tania Australis's star type is 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 .
  • Mu Ursae Majoris is the Bayer name for the star. It was assigned this name by Johann Bayer in 1603. The closer to the start of the Greek Alphabet the name, the brighter the star is. Alpha stars tend to be the brightest in the constellation. A notable exception is Pollux (Beta Geminorum) which is the brighest star in the Gemini constellation.
  • 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.

Tania Australis's Alternative Names

Mu Ursae Majoris (Mu. Uma) is the Bayer Classification for the star. 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 numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 34 Ursae Majoris with it 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 star alternative names can be found at Star Names .

Location of Tania Australis

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

Radial Velocity and Proper Motion of Tania Australis

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 miliarcseconds/year towards the north and -81.47 ± 0.54 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 the Sun is -22.15 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 (Colour, Temperature, Age, Mass) of Tania Australis

Tania Australis has a spectral type of M0III SB. This means the star is a red giant star. The star is 7,439.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,263.29 s. The star has a B-V Colour Index of 1.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,779 Kelvin.

Tania Australis 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 37.51. 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 1.23 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 -0.250000, 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.

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 13.11 which gave the calculated distance to Tania Australis as 248.79 light years away from Earth or 76.28 parsecs. It would take a spaceship travelling at the speed of light, 248.79 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 14.16 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*.

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
Colour red
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 Latitude56.36 degrees
Galactic Longitude177.90 degrees
1997 Distance from Earth13.11 Parallax (milliarcseconds)
 248.79 Light Years
 76.28 Parsecs
2007 Distance from Earth14.16 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.35.34 ± 0.34 milliarcseconds/year
Proper Motion RA.-81.47 ± 0.54 milliarcseconds/year
B-V Index1.60
Radial Velocity-22.15 ± 3.58 km/s
Iron Abundance-0.04 ± 9.99 Fe/H
Eccentricity0.23
Semi-Major Axis9356.00

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 Facts


Calculated Effective Temperature3,779 Kelvin
Mass Compared to the Sun1.23

Sources and Links


SIMBAD SourceLink

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