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V928 Centauri, HD108759, HIP60979

Primary Facts on V928 Centauri

  • V928 Centauri's star type is pulsating giant star that can be located in the constellation of Centaurus. The description is based on the spectral class.
  • V928 Centauri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M2II/III) of the star, the star's colour is red .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 737.93 light years away from us.

V928 Centauri's Alternative Names

HIP60979 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD108759.

V928 Centauri has alternative name(s) :- , V928 Cen.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 123 G. Centauri. There are no stars with a Gould designation in Ursa Major for example.

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

Location of V928 Centauri

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 V928 Centauri, the location is 12h 29m 57.88 and -41° 44` 09.1 .

Radial Velocity and Proper Motion of V928 Centauri

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 -16.80 ± 0.21 miliarcseconds/year towards the north and 5.67 ± 0.37 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 the Sun is 4.60 km/s with an error of about 0.80 km/s . 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.

V928 Centauri 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 507.09 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 V928 Centauri

V928 Centauri has a spectral type of M2II/III. This means the star is a red giant star. The star is 7,302.00 Parsecs from the Galactic Centre or in terms of Light Years is 23,816.45 s. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,971 Kelvin.

V928 Centauri Radius has been calculated as being 35.08 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 24,411,829.50.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 28.13. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V928 Centauri Apparent and Absolute Magnitudes

V928 Centauri has an apparent magnitude of 6.00 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 -1.25 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.77. 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 V928 Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.55 which gave the calculated distance to V928 Centauri as 918.77 light years away from Earth or 281.69 parsecs. It would take a spaceship travelling at the speed of light, 918.77 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 4.42 which put V928 Centauri at a distance of 737.93 light years or 226.24 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 46,665,024.60 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.

The star's Galacto-Centric Distance is 7,302.00 Parsecs or 23,816.45 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V928 Centauri

The star is a pulsating Semi-Regular Star w 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. V928 Centauri brightness ranges from a magnitude of 6.082 to a magnitude of 6.006 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 V928 Centauri Facts and Figures

Visual Facts


Primary / Proper / Traditional NameV928 Centauri
Alternative NamesHD 108759, HIP 60979, 123 G. Centauri, V928 Cen
Spectral TypeM2II/III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
ConstellationCentaurus
Absolute Magnitude -1.25 / -0.77
Visual / Apparent Magnitude6.00
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)12h 29m 57.88
Declination (Dec.)-41° 44` 09.1
Galactic Latitude20.96 degrees
Galactic Longitude298.64 degrees
1997 Distance from Earth3.55 Parallax (milliarcseconds)
 918.77 Light Years
 281.69 Parsecs
2007 Distance from Earth4.42 Parallax (milliarcseconds)
 737.93 Light Years
 226.24 Parsecs
 46,665,024.60 Astronomical Units
Galacto-Centric Distance23,816.45 Light Years / 7,302.00 Parsecs
Proper Motion Dec.-16.80 ± 0.21 milliarcseconds/year
Proper Motion RA.5.67 ± 0.37 milliarcseconds/year
B-V Index1.51
Radial Velocity4.60 ± 0.80 km/s
Eccentricity0.17
Semi-Major Axis7899.00
Stellar Luminosity (Lsun)507.09

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSemi-Regular Star w
Mean Variability Period in Days0.061
Variable Magnitude Range (Brighter - Dimmer)6.006 - 6.082

Estimated Facts


Calculated Effective Temperature3,971 Kelvin

Sources and Links


SIMBAD SourceLink

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