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AW Antliae

AW Antliae Facts

AW Antliae's Alternative Names

HIP51847 is the reference name for the star in the Hipparcos Star Catalogue.

AW Antliae has alternative name(s) :- , AW Ant.

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

Location of AW Antliae

The location of the variable 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 AW Antliae, the location is 10h 35m 32.36 and -36° 23` 12.2 .

Proper Motion of AW Antliae

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 2.12 ± 0.86 milliarcseconds/year towards the north and -10.27 ± 1.23 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 AW Antliae

AW Antliae Colour and Temperature

AW Antliae has a spectral type of G5. This means the star is a yellow variable star. The star has a B-V Colour Index of 0.73 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,581 Kelvin.

AW Antliae Radius

Radius has been calculated as being 13.79 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,593,358.13.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 13.98. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

AW Antliae Apparent and Absolute Magnitudes

AW Antliae has an apparent magnitude of 8.73 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 -0.70 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.73. 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 AW Antliae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.30 which gave the calculated distance to AW Antliae as 2508.95 light years away from Earth or 769.23 parsecs. It would take a spaceship travelling at the speed of light, 2508.95 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 1.28 which put AW Antliae at a distance of 2548.15 light years or 781.25 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 161,143,257.02 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 AW Antliae

The star is a pulsating Slow Irregular 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. AW Antliae brightness ranges from a magnitude of 9.090 to a magnitude of 8.720 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.3 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 AW Antliae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAW Antliae
Alternative NamesHIP 51847, AW Ant
Spectral TypeG5
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeVariable Star
ColourYellow
GalaxyMilky Way
ConstellationAntlia
Absolute Magnitude -0.70 / -0.73
Visual / Apparent Magnitude8.73
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)10h 35m 32.36
Declination (Dec.)-36° 23` 12.2
Galactic Latitude18.88 degrees
Galactic Longitude274.54 degrees
1997 Distance from Earth1.30 Parallax (milliarcseconds)
  2508.95 Light Years
 769.23 Parsecs
2007 Distance from Earth1.28 Parallax (milliarcseconds)
 2548.15 Light Years
 781.25 Parsecs
 161,143,257.02 Astronomical Units
Proper Motion Dec.2.12 ± 0.86 milliarcseconds/year
Proper Motion RA.-10.27 ± 1.23 milliarcseconds/year
B-V Index0.73

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.345
Variable Magnitude Range (Brighter - Dimmer)8.720 - 9.090

Estimated Calculated Facts


Radius (x the Sun)13.98
Effective Temperature5,581 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
-35 6557.2A9.40000-10.000002.00000G5Yellow
B9.90000-10.000002.000001991

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