Universe Guide


V815 Centauri - HD96616 - HIP54360

V815 Centauri is a blue rotating star that can be located in the constellation of Centaurus. HIP54360 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD96616. The Id of the star in the Gould Star Catalogue is 4. Stars in the southern hemisphere are more likely to have a Gould Id than the northern hemisphere. For example, there are no Gould classified stars in Ursa Major. V815 Centauri has alternative name(s), V815_Cen.

Location of V815 Centauri

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 V815 Centauri, the location is 11h 07m 16.76 and -42d38`19.6 .

Proper Motion of V815 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 041.40 ± 000.22 towards the north and -083.03 ± 000.39 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V815 Centauri

V815 Centauri has a spectral type of Ap SrCrEu. This means the star is a blue star. The star has a B-V Colour Index of 0.02 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,824 Kelvin.

V815 Centauri has been calculated as 2.62 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,823,084.11.km.

V815 Centauri Apparent and Absolute Magnitudes

V815 Centauri has an apparent magnitude of 5.15 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 0.45 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.53. 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 V815 Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.50 which gave the calculated distance to V815 Centauri as 283.62 light years away from Earth or 86.96 parsecs. It would take a spaceship travelling at the speed of light, 283.62 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 11.89 which put V815 Centauri at a distance of 274.32 light years or 84.10 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.

Variable Type of V815 Centauri

The star is a rotating Alpha2 Canum Venaticorum 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. V815 Centauri brightness ranges from a magnitude of 5.000 to a magnitude of 5.000 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.0 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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

V815 Centauri Facts

Alternative Names

Traditional NameV815 Centauri
Short NameV815 Cen
Hipparcos Library I.D.54360
Gould I.D.4
Henry Draper Designation96616

Visual Facts

Star Type star
Absolute Magnitude0.45 / 0.53
Apparent Magnitude5.15
Right Ascension (R.A.)11h 07m 16.76
Declination (Dec.)-42d38`19.6
1997 Distance from Earth11.50 Parallax (milliarcseconds)
 283.62 Light Years
 86.96 Parsecs
2007 Revised Distance from Earth11.89 Parallax (milliarcseconds)
 274.32 Light Years
 84.10 Parsecs
Proper Motion Dec.41.40 ± 0.22 milliarcseconds/year
Proper Motion RA.-83.03 ± 0.39 milliarcseconds/year
B-V Index0.02
Spectral TypeAp SrCrEu
Colour(A) blue

Variable Star Details

Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venaticorum
Mean Variability Period in Days2.000

Estimated Facts

Radius (x the Sun)2.62
Calculated Effective Temperature9,824 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.

Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
96616-41 6343.2A5.50000-92.0000041.00000A5White

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