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Alpha Antliae, HD90610, HIP51172, HR4104

Alpha Antliae (Alpha Antliae) Location in Antlia

Alpha Antliae is a orange to red giant star that can be located in the constellation of Antlia. The description is based on the spectral class. Alpha Antliae is the 1st brightest star in Antlia based on the Hipparcos 2007 apparent magnitude. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Alpha Antliae's Alternative Names

Alpha Antliae (Alf Ant) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR4104. HIP51172 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD90610.

Alpha Antliae has alternative name(s) :- , NSV 04862.

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

Location of Alpha 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 Alpha Antliae, the location is 10h 27m 09.16 and -31° 04` 04.1 .

Proper Motion of Alpha 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 10.53 ± 0.36 miliarcseconds/year towards the north and -81.61 ± 0.49 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 12.20000 km/s with an error of about 2.70 km/s .

Alpha Antliae 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 502.46 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 Alpha Antliae

Alpha Antliae has a spectral type of K4III. This means the star is a orange to red giant star. The star is 7,401.00 Parsecs from the Galactic Centre or terms of Light Years is 24,139.35 s. The star has a B-V Colour Index of 1.42 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,126 Kelvin.

Alpha Antliae Radius has been calculated as being 28.57 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 19,876,453.91.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 28.57. 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 -0.29 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Alpha Antliae Apparent and Absolute Magnitudes

Alpha Antliae has an apparent magnitude of 4.28 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 -0.97 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.97. 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 Alpha Antliae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.90 which gave the calculated distance to Alpha Antliae as 366.48 light years away from Earth or 112.36 parsecs. It would take a spaceship travelling at the speed of light, 366.48 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 8.91 which put Alpha Antliae at a distance of 366.06 light years or 112.23 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 7,401.00 Parsecs or 24,139.35 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*. Alpha Antliae brightness ranges from a magnitude of 4.426 to a magnitude of 4.389 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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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Alpha Antliae Facts

Visual Facts


Primary / Proper / Traditional NameAlpha Antliae
Alternative NamesAlf Ant, HD 90610, HIP 51172, HR 4104, NSV 04862
Spectral TypeK4III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
ConstellationAntlia
Absolute Magnitude-0.97 / -0.97
Visual / Apparent Magnitude4.28
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)10h 27m 09.16
Declination (Dec.)-31° 04` 04.1
Galactic Latitude22.39 degrees
Galactic Longitude269.88 degrees
1997 Distance from Earth8.90 Parallax (milliarcseconds)
 366.48 Light Years
 112.36 Parsecs
2007 Distance from Earth8.91 Parallax (milliarcseconds)
 366.06 Light Years
 112.23 Parsecs
Galacto-Centric Distance24,139.35 Light Years / 7,401.00 Parsecs
Proper Motion Dec.10.53 ± 0.36 milliarcseconds/year
Proper Motion RA.-81.61 ± 0.49 milliarcseconds/year
B-V Index1.42
Radial Velocity12.20 ± 2.70 km/s
Iron Abundance-0.29 ± 9.99 Fe/H
Eccentricity0.11
Semi-Major Axis7181.00
Stellar Luminosity (Lsun)502.46

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.028
Variable Magnitude Range (Brighter - Dimmer)4.389 - 4.426

Estimated Facts


Calculated Effective Temperature4,126 Kelvin

Sources and Links


SIMBAD SourceLink

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