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Beta Arae, HD157244, HIP85258, HR6461

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

Beta Arae's Alternative Names

Beta Arae is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR6461. HIP85258 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD157244.

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

Location of Beta Arae

The location of the star in the galaxy 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 Beta Arae, the location is 17h 25m 18.00 and -55° 31` 47.4 .

Proper Motion of Beta 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 -25.24 ± 0.37 miliarcseconds/year towards the north and -8.51 ± 0.64 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 -0.30000 km/s with an error of about 0.30 km/s .

Beta 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 6327.5500000 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 Beta Arae

Beta Arae has a spectral type of K3Ib-II. This means the star is a orange to red luminous giant star. The star is 7227.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23571.8248708800000000s. The star has a B-V Colour Index of 1.47 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,076 Kelvin.

Beta Arae Radius has been calculated as being 93.43 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 65,006,044.79.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 100.11. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Beta Arae Apparent and Absolute Magnitudes

Beta Arae has an apparent magnitude of 2.84 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 -3.49 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.64. 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 Beta Arae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.41 which gave the calculated distance to Beta Arae as 602.89 light years away from Earth or 184.84 parsecs. It would take a spaceship travelling at the speed of light, 602.89 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 5.05 which put Beta Arae at a distance of 645.87 light years or 198.02 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 7,227.00 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*.

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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Beta Arae Facts

Visual Facts

Alternative Names, HD 157244, HIP 85258, HR 6461
Star TypeLuminous Giant Star
GalaxyMilky Way
Absolute Magnitude-3.49 / -3.64
Visual / Apparent Magnitude2.84
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)17h 25m 18.00
Declination (Dec.)-55° 31` 47.4
Galactic Latitude-11.01 degrees
Galactic Longitude335.37 degrees
1997 Distance from Earth5.41 Parallax (milliarcseconds)
 602.89 Light Years
 184.84 Parsecs
2007 Revised Distance from Earth5.05 Parallax (milliarcseconds)
 645.87 Light Years
 198.02 Parsecs
Galacto-Centric Distance23,571.82 Light Years / 7,227.00 Parsecs
Proper Motion Dec.-25.24 ± 0.37 milliarcseconds/year
Proper Motion RA.-8.51 ± 0.64 milliarcseconds/year
B-V Index1.47
Radial Velocity-0.30 ± 0.30 km/s
Semi-Major Axis6662.00
Stellar Luminosity (Lsun)6,327.55
Spectral TypeK3Ib-II
Colour(K) Orange to Red

Estimated Facts

Calculated Effective Temperature4,076 Kelvin

Sources and Links

SIMBAD SourceLink

Location of Beta Arae in Ara

Beta Arae (Beta Arae) Location in Ara

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

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