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XX Antliae, HD85207, HIP48188

XX Antliae is a blue eclipsing main sequence dwarf star that can be located in the constellation of Antlia. The description is based on the spectral class. The star can not be seen by the naked eye, you need a telescope to see it. The star has an estimated age of 1.80 Billion of Years but could be as young as 1.60 to 2.00 according to Hipparcos.

XX Antliae's Alternative Names

HIP48188 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD85207.

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

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

Location of XX Antliae

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 XX Antliae, the location is 09h 49m 24.72 and -38° 20` 57.5 .

Proper Motion of XX 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 24.13 ± 0.71 miliarcseconds/year towards the north and -17.99 ± 1.11 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Age) of XX Antliae

XX Antliae has a spectral type of A8/F0V + (F). This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of 0.4 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,728 Kelvin.

XX Antliae Radius has been calculated as being 3.17 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,205,968.83.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 3.37. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.03 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 1.80 Billion years old but could be between 1.60 and 2.00 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

XX Antliae Apparent and Absolute Magnitudes

XX Antliae has an apparent magnitude of 8.64 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 1.68 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.55. 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 XX Antliae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 4.06 which gave the calculated distance to XX Antliae as 803.36 light years away from Earth or 246.31 parsecs. It would take a spaceship travelling at the speed of light, 803.36 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 3.82 which put XX Antliae at a distance of 853.83 light years or 261.78 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.

Variable Type of XX Antliae

The star is a eclipsing Beta Lyrae (Sheliak)/Detached Main-Sequence (subtype) 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. XX Antliae brightness ranges from a magnitude of 9.227 to a magnitude of 8.676 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.9 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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XX Antliae Facts

Visual Facts


Primary / Proper / Traditional NameXX Antliae
Alternative NamesHD 85207, HIP 48188, XX Ant
Spectral TypeA8/F0V + (F)
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationAntlia
Age1.80 Billion Years Old
Age Range1.60 - 2.00 Billion Years Old
Absolute Magnitude1.68 / 1.55
Visual / Apparent Magnitude8.64
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)09h 49m 24.72
Declination (Dec.)-38° 20` 57.5
Galactic Latitude11.90 degrees
Galactic Longitude268.06 degrees
1997 Distance from Earth4.06 Parallax (milliarcseconds)
 803.36 Light Years
 246.31 Parsecs
2007 Distance from Earth3.82 Parallax (milliarcseconds)
 853.83 Light Years
 261.78 Parsecs
Proper Motion Dec.24.13 ± 0.71 milliarcseconds/year
Proper Motion RA.-17.99 ± 1.11 milliarcseconds/year
B-V Index0.40
Iron Abundance-0.03 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Lyrae (Sheliak)/Detached Main-Sequence (subtype)
Mean Variability Period in Days0.888
Variable Magnitude Range (Brighter - Dimmer)8.676 - 9.227

Estimated Facts


Calculated Effective Temperature6,728 Kelvin

Sources and Links


SIMBAD SourceLink

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