Universe Guide


V871 Centauri, HD101205, HIP56769

V871 Centauri is a blue star that can be located in the constellation of Centaurus. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

HIP56769 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD101205.

V871 Centauri has alternative name(s), V871 Cen.

Location of V871 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 V871 Centauri, the location is 11h 38m 20.37 and -63 d 22`21.9 .

Proper Motion of V871 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 1.43 ± 0.66 miliarcseconds/year towards the north and -6.75 ± 0.95 miliarcseconds/year east if we saw them in the horizon.

V871 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 80000.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of V871 Centauri

V871 Centauri has a spectral type of O8var. This means the star is a blue star. The star has a B-V Colour Index of 0.04 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,410 Kelvin. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V871 Centauri Apparent and Absolute Magnitudes

V871 Centauri has an apparent magnitude of 6.46 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 -5.88. 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 V871 Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -1.00 which gave the calculated distance to V871 Centauri as -3261.63 light years away from Earth or -1000 parsecs. It would take a spaceship travelling at the speed of light, -3261.63 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 0.34 which put V871 Centauri at a distance of 9593.04 light years or 2941.18 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. V871 Centauri brightness ranges from a magnitude of 6.534 to a magnitude of 6.439 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.

V871 Centauri Facts

Alternative Names

Traditional/Proper NameV871 Centauri
Short NameV871 Cen
Hipparcos Library I.D.56769
Henry Draper Designation101205

Visual Facts

Star Type star
Visual / Apparent Magnitude6.46
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)11h 38m 20.37
Declination (Dec.)-63 d 22`21.9
Galactic Latitude-1.65 degrees
Galactic Longitude294.85 degrees
1997 Distance from Earth-1.00 Parallax (milliarcseconds)
 -3261.63 Light Years
 -1000 Parsecs
2007 Revised Distance from Earth0.34 Parallax (milliarcseconds)
 9593.04 Light Years
 2941.18 Parsecs
Proper Motion Dec.1.43 ± 0.66 milliarcseconds/year
Proper Motion RA.-6.75 ± 0.95 milliarcseconds/year
B-V Index0.04
Radial Velocity-25.00 ± 10.00 km/s
Spectral TypeO8var
Colour(O) blue

Variable Star Details

Mean Variability Period in Days0.091
Variable Magnitude Range (Brighter - Dimmer)6.439 - 6.534

Estimated Facts

Luminosity (x the Sun)80,000.0000000
Calculated Effective Temperature9,410 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
101205-62 2168.4A7.600002.00000-15.00000B2Blue/White

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