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V989 Centauri, HD121804, HIP68298

Primary Facts on V989 Centauri

  • V989 Centauri's star type is giant star that can be located in the constellation of Centaurus. The description is based on the spectral class.
  • V989 Centauri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M0/M1III) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 4593.85 light years away from us.

V989 Centauri's Alternative Names

HIP68298 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD121804.

V989 Centauri has alternative name(s) :- , V989 Cen.

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

Location of V989 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 V989 Centauri, the location is 13h 58m 52.23 and -47° 48` 25.2 .

Proper Motion of V989 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 -16.76 ± 0.43 miliarcseconds/year towards the north and -8.76 ± 0.66 miliarcseconds/year east if we saw them in the horizon. . 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.

Physical Properties (Colour, Temperature) of V989 Centauri

V989 Centauri has a spectral type of M0/M1III. This means the star is a red giant star. The star has a B-V Colour Index of 1.69 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,502 Kelvin.

V989 Centauri Radius has been calculated as being 113.84 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 79,211,374.96.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 117.03. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V989 Centauri Apparent and Absolute Magnitudes

V989 Centauri has an apparent magnitude of 7.42 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 -3.26 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.32. 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 V989 Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.73 which gave the calculated distance to V989 Centauri as 4467.99 light years away from Earth or 1369.86 parsecs. It would take a spaceship travelling at the speed of light, 4467.99 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 0.71 which put V989 Centauri at a distance of 4593.85 light years or 1408.45 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 290,511,642.05 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. V989 Centauri brightness ranges from a magnitude of 7.552 to a magnitude of 7.451 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 V989 Centauri Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV989 Centauri
Alternative NamesHD 121804, HIP 68298, V989 Cen
Spectral TypeM0/M1III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour red
GalaxyMilky Way
Absolute Magnitude -3.26 / -3.32
Visual / Apparent Magnitude7.42
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 58m 52.23
Declination (Dec.)-47° 48` 25.2
Galactic Latitude13.55 degrees
Galactic Longitude314.49 degrees
1997 Distance from Earth0.73 Parallax (milliarcseconds)
 4467.99 Light Years
 1369.86 Parsecs
2007 Distance from Earth0.71 Parallax (milliarcseconds)
 4593.85 Light Years
 1408.45 Parsecs
 290,511,642.05 Astronomical Units
Proper Motion Dec.-16.76 ± 0.43 milliarcseconds/year
Proper Motion RA.-8.76 ± 0.66 milliarcseconds/year
B-V Index1.69

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Mean Variability Period in Days0.070
Variable Magnitude Range (Brighter - Dimmer)7.451 - 7.552

Estimated Facts

Calculated Effective Temperature3,502 Kelvin

Sources and Links

SIMBAD SourceLink

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