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MP Trianguli Australis

MP Trianguli Australis Facts

MP Trianguli Australis's Alternative Names

HIP78526 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD143028.

MP Trianguli Australis has alternative name(s) :- , MP TrA.

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

Location of MP Trianguli Australis

The location of the luminous 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 MP Trianguli Australis, the location is 16h 01m 53.04 and -64° 24` 00.8 .

Proper Motion of MP Trianguli 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 -6.22 ± 0.48 milliarcseconds/year towards the north and -3.10 ± 0.75 milliarcseconds/year east if we saw them in the horizon. . 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) of MP Trianguli Australis

MP Trianguli Australis Colour and Temperature

MP Trianguli Australis has a spectral type of B7Ib/II. This means the star is a blue luminous giant star. The star has a B-V Colour Index of -0.07 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,523 Kelvin.

MP Trianguli Australis Radius

Radius has been calculated as being 1.94 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,348,871.50.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 1.54. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

MP Trianguli Australis Apparent and Absolute Magnitudes

MP Trianguli Australis has an apparent magnitude of 7.81 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 0.05 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.55. 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 MP Trianguli Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 2.81 which gave the calculated distance to MP Trianguli Australis as 1160.72 light years away from Earth or 355.87 parsecs. It would take a spaceship travelling at the speed of light, 1160.72 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 3.53 which put MP Trianguli Australis at a distance of 923.98 light years or 283.29 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 58,432,349.80 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.

Variable Type of MP Trianguli Australis

The star is a eclipsing binary sys Eclipsing 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. This is a some uncertainty as to the type but the type mentioned is the current variable star classification for this star. MP Trianguli Australis brightness ranges from a magnitude of 7.868 to a magnitude of 7.758 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 MP Trianguli Australis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameMP Trianguli Australis
Alternative NamesHD 143028, HIP 78526, MP TrA
Spectral TypeB7Ib/II
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeLuminous Giant Star
ColourBlue
GalaxyMilky Way
ConstellationTriangulum Australe
Absolute Magnitude 0.05 / 0.55
Visual / Apparent Magnitude7.81
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)16h 01m 53.04
Declination (Dec.)-64° 24` 00.8
Galactic Latitude-8.74 degrees
Galactic Longitude321.77 degrees
1997 Distance from Earth2.81 Parallax (milliarcseconds)
 1160.72 Light Years
 355.87 Parsecs
2007 Distance from Earth3.53 Parallax (milliarcseconds)
 923.98 Light Years
 283.29 Parsecs
 58,432,349.80 Astronomical Units
Proper Motion Dec.-6.22 ± 0.48 milliarcseconds/year
Proper Motion RA.-3.10 ± 0.75 milliarcseconds/year
B-V Index-0.07

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeEclipsing probably
Mean Variability Period in Days0.107
Variable Magnitude Range (Brighter - Dimmer)7.758 - 7.868

Estimated Calculated Facts


Radius (x the Sun)1.54
Effective Temperature12,523 Kelvin

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
143028-64 3346.4A8.50000-3.00000-6.00000B7Blue/White
B8.60000-3.00000-6.000001991

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