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Zeta Arae, HD152786, HIP83081, HR6285

Zeta Arae is a orange to red giant star that can be located in the constellation of Ara. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Zeta Arae's Alternative Names

Zeta Arae (Zet Ara) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6285. HIP83081 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD152786.

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

Location of Zeta Arae

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 Zeta Arae, the location is 16h 58m 37.23 and -55° 59` 24.2 .

Proper Motion of Zeta Arae

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 -36.67 ± 0.11 miliarcseconds/year towards the north and -17.80 ± 0.19 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 -6.00000 km/s with an error of about 0.60 km/s .

Zeta Arae 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 3,585.25 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 Zeta Arae

Zeta Arae has a spectral type of K5III. This means the star is a orange to red giant star. The star is 7,269.00 Parsecs from the Galactic Centre or terms of Light Years is 23,708.81 s. The star has a B-V Colour Index of 1.55 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,892 Kelvin.

Zeta Arae Radius has been calculated as being 86.02 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 59,851,177.57.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 72.88. 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 -0.40 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

Zeta Arae Apparent and Absolute Magnitudes

Zeta Arae has an apparent magnitude of 3.12 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 -3.11 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.75. 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 Zeta Arae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.68 which gave the calculated distance to Zeta Arae as 574.23 light years away from Earth or 176.06 parsecs. It would take a spaceship travelling at the speed of light, 574.23 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 6.71 which put Zeta Arae at a distance of 486.09 light years or 149.03 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 7,269.00 Parsecs or 23,708.81 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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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Zeta Arae Facts

Visual Facts


 Zeta Arae
Alternative NamesZet Ara, HD 152786, HIP 83081, HR 6285
Spectral TypeK5III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
ConstellationAra
Absolute Magnitude-3.11 / -2.75
Visual / Apparent Magnitude3.12
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)16h 58m 37.23
Declination (Dec.)-55° 59` 24.2
Galactic Latitude-8.20 degrees
Galactic Longitude332.80 degrees
1997 Distance from Earth5.68 Parallax (milliarcseconds)
 574.23 Light Years
 176.06 Parsecs
2007 Distance from Earth6.71 Parallax (milliarcseconds)
 486.09 Light Years
 149.03 Parsecs
Galacto-Centric Distance23,708.81 Light Years / 7,269.00 Parsecs
Proper Motion Dec.-36.67 ± 0.11 milliarcseconds/year
Proper Motion RA.-17.80 ± 0.19 milliarcseconds/year
B-V Index1.55
Radial Velocity-6.00 ± 0.60 km/s
Iron Abundance-0.40 ± 9.99 Fe/H
Eccentricity0.09
Semi-Major Axis6679.00
Stellar Luminosity (Lsun)3,585.25

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature3,892 Kelvin

Sources and Links


SIMBAD SourceLink

Location of Zeta Arae in Ara


Zeta Arae (Zeta Arae) Location in Ara

The map was generated using Night Vision, an awesome free application by Brian Simpson.

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