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HomeFactsConstellationsTriangulum Australe

LX Trianguli Australis, HD137066, HIP75665

LX Trianguli Australis is a orange to red giant star that can be located in the constellation of TriangulumAustrale. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

LX Trianguli Australis's Alternative Names

HIP75665 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD137066.

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

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

Location of LX Trianguli Australis

The location of the star in the galaxy 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 LX Trianguli Australis, the location is 15h 27m 33.10 and -64° 31` 53.2 .

Proper Motion of LX 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 -18.28 ± 0.29 miliarcseconds/year towards the north and -12.37 ± 0.43 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 -8.40000 km/s with an error of about 0.40 km/s .

Physical Properties (Colour, Temperature) of LX Trianguli Australis

LX Trianguli Australis has a spectral type of K5/M0III. This means the star is a orange to red giant star. The star is 7246.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23633.7959062400000000s. The star has a B-V Colour Index of 1.64 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,671 Kelvin.

LX Trianguli Australis Radius has been calculated as being 34.62 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 24,089,495.27.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 34.78. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

LX Trianguli Australis Apparent and Absolute Magnitudes

LX Trianguli Australis has an apparent magnitude of 5.71 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 -0.88 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.89. 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 LX Trianguli Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.80 which gave the calculated distance to LX Trianguli Australis as 679.51 light years away from Earth or 208.33 parsecs. It would take a spaceship travelling at the speed of light, 679.51 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 4.78 which put LX Trianguli Australis at a distance of 682.35 light years or 209.21 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 7,246.00 Parsecs or 23,633.80 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. LX Trianguli Australis brightness ranges from a magnitude of 5.833 to a magnitude of 5.810 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 27.4 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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LX Trianguli Australis Facts

Visual Facts

Alternative NamesHD 137066, HIP 75665, LX TrA
Star TypeGiant Star
GalaxyMilky Way
ConstellationTriangulum Australe
Absolute Magnitude-0.88 / -0.89
Visual / Apparent Magnitude5.71
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)15h 27m 33.10
Declination (Dec.)-64° 31` 53.2
Galactic Latitude-6.57 degrees
Galactic Longitude318.75 degrees
1997 Distance from Earth4.80 Parallax (milliarcseconds)
 679.51 Light Years
 208.33 Parsecs
2007 Revised Distance from Earth4.78 Parallax (milliarcseconds)
 682.35 Light Years
 209.21 Parsecs
Galacto-Centric Distance23,633.80 Light Years / 7,246.00 Parsecs
Proper Motion Dec.-18.28 ± 0.29 milliarcseconds/year
Proper Motion RA.-12.37 ± 0.43 milliarcseconds/year
B-V Index1.64
Radial Velocity-8.40 ± 0.40 km/s
Semi-Major Axis7472.00
Spectral TypeK5/M0III
Colour(K) Orange to Red

Variable Star Details

Mean Variability Period in Days27.355
Variable Magnitude Range (Brighter - Dimmer)5.810 - 5.833

Estimated Facts

Calculated Effective Temperature3,671 Kelvin

Sources and Links

SIMBAD SourceLink

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