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V987 Centauri, HD121556, HIP68218

Primary Facts on V987 Centauri

  • V987 Centauri's star type is main sequence dwarf star that can be located in the constellation of Centaurus. The description is based on the spectral class.
  • V987 Centauri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B5V:n) of the star, the star's colour is blue .
  • 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 5096.30 light years away from us.

V987 Centauri's Alternative Names

HIP68218 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD121556.

V987 Centauri has alternative name(s) :- , V987 Cen.

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

Location of V987 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 V987 Centauri, the location is 13h 57m 57.77 and -59° 53` 04.9 .

Proper Motion of V987 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 -1.86 ± 0.72 miliarcseconds/year towards the north and -2.14 ± 1.07 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 V987 Centauri

V987 Centauri has a spectral type of B5V:n. This means the star is a blue main sequence dwarf star. The star has a B-V Colour Index of -0.01 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,679 Kelvin.

V987 Centauri Apparent and Absolute Magnitudes

V987 Centauri has an apparent magnitude of 8.84 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -2.13. 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 V987 Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.49 which gave the calculated distance to V987 Centauri as -6656.39 light years away from Earth or -2040.82 parsecs. It would take a spaceship travelling at the speed of light, -6656.39 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 0.64 which put V987 Centauri at a distance of 5096.30 light years or 1562.5 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 322,286,514.04 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. V987 Centauri brightness ranges from a magnitude of 8.900 to a magnitude of 8.795 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 V987 Centauri Facts and Figures

Visual Facts


Primary / Proper / Traditional NameV987 Centauri
Alternative NamesHD 121556, HIP 68218, V987 Cen
Spectral TypeB5V:n
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationCentaurus
Absolute Magnitude / -2.13
Visual / Apparent Magnitude8.84
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 57m 57.77
Declination (Dec.)-59° 53` 04.9
Galactic Latitude1.92 degrees
Galactic Longitude311.19 degrees
1997 Distance from Earth-0.49 Parallax (milliarcseconds)
 -6656.39 Light Years
 -2040.82 Parsecs
2007 Distance from Earth0.64 Parallax (milliarcseconds)
 5096.30 Light Years
 1562.5 Parsecs
 322,286,514.04 Astronomical Units
Proper Motion Dec.-1.86 ± 0.72 milliarcseconds/year
Proper Motion RA.-2.14 ± 1.07 milliarcseconds/year
B-V Index-0.01

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.075
Variable Magnitude Range (Brighter - Dimmer)8.795 - 8.900

Estimated Facts


Calculated Effective Temperature9,679 Kelvin

Sources and Links


SIMBAD SourceLink

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