Universe Guide

LZ Trianguli Australis

LZ Trianguli Australis Facts

LZ Trianguli Australis's Alternative Names

HIP76454 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD138521.

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

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

Location of LZ Trianguli Australis

The location of the subgiant 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 LZ Trianguli Australis, the location is 15h 36m 52.68 and -67° 29` 04.8 .

Proper Motion of LZ 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 -17.47 ± 0.48 milliarcseconds/year towards the north and -7.29 ± 0.71 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.

LZ Trianguli Australis 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 34.45 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of LZ Trianguli Australis

LZ Trianguli Australis Colour and Temperature

LZ Trianguli Australis has a spectral type of B9IV. This means the star is a blue subgiant star. The star has a B-V Colour Index of 0 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,531 Kelvin.

LZ Trianguli Australis Radius

Radius has been calculated as being 2.28 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,588,920.81.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 2.06. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

LZ Trianguli Australis Apparent and Absolute Magnitudes

LZ Trianguli Australis has an apparent magnitude of 8.06 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 0.88 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.10. 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 LZ Trianguli Australis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.66 which gave the calculated distance to LZ Trianguli Australis as 891 light years away from Earth or 273 parsecs. If you want that in miles, it is 597,519,416,439.

In 2007, Hipparcos data was revised with a new parallax of 4.04 which put LZ Trianguli Australis at a distance of 807 light years or 247 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 50,947,052.14 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 7,227.00 Parsecs or 23,571.82 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 LZ Trianguli 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)
Airbus A380736735,309,265.00
Speed of Sound (Mach 1)767.269705,342,741.00
Concorde (Mach 2)1,534.54352,670,910.00
New Horizons Probe33,00016,399,624.00
Speed of Light670,616,629.00807.00

Variable Type of LZ Trianguli Australis

The star is a pulsating Slow Pulsating B- st 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. LZ Trianguli Australis brightness ranges from a magnitude of 8.078 to a magnitude of 8.048 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.6 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 LZ Trianguli Australis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameLZ Trianguli Australis
Alternative NamesLZ TrA, HD 138521, HIP 76454, LZ TrA
Spectral TypeB9IV
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
GalaxyMilky Way
ConstellationTriangulum Australe
Absolute Magnitude 0.88 / 1.10
Visual / Apparent Magnitude8.06
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 36m 52.68
Declination (Dec.)-67° 29` 04.8
Galactic Latitude-9.52 degrees
Galactic Longitude317.80 degrees
1997 Distance from Earth3.66 Parallax (milliarcseconds)
 891 Light Years
 273 Parsecs
2007 Distance from Earth4.04 Parallax (milliarcseconds)
 807 Light Years
 247 Parsecs
 50,947,052.14 Astronomical Units
Galacto-Centric Distance23,571.82 Light Years / 7,227.00 Parsecs
Proper Motion Dec.-17.47 ± 0.48 milliarcseconds/year
Proper Motion RA.-7.29 ± 0.71 milliarcseconds/year
B-V Index0.00
Stellar Luminosity (Lsun)34.45

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSlow Pulsating B- st
Mean Variability Period in Days0.570
Variable Magnitude Range (Brighter - Dimmer)8.048 - 8.078

Estimated Calculated Facts

Radius (x the Sun)2.06
Effective Temperature9,531 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Comments and Questions

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