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222 G. Cen, HD116862, HIP65630

222 G. Cen is a blue subgiant 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.

HIP65630 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD116862. The Id of the star in the Gould Star Catalogue is 222. 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.

Location of 222 G. Cen

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 222 G. Cen, the location is 13h 27m 20.66 and -49d 22` 52.6 .

Proper Motion of 222 G. Cen

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 -3.56 ± 0.31 miliarcseconds/year towards the north and -5.49 ± 0.43 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of 222 G. Cen

222 G. Cen has a spectral type of B3IV. This means the star is a blue subgiant star. The star has a B-V Colour Index of -0.12 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,367 Kelvin.

222 G. Cen Radius has been calculated as being 8.02 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,583,266.59.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 9.09. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

222 G. Cen Apparent and Absolute Magnitudes

222 G. Cen has an apparent magnitude of 6.27 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 -2.98 If you used the 2007 Parallax value, you would get an absolute magnitude of -3.25. 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 222 G. Cen

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.41 which gave the calculated distance to 222 G. Cen as 2313.22 light years away from Earth or 709.22 parsecs. It would take a spaceship travelling at the speed of light, 2313.22 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 1.25 which put 222 G. Cen at a distance of 2609.31 light years or 800 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. 222 G. Cen brightness ranges from a magnitude of 6.257 to a magnitude of 6.212 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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 Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

222 G. Cen Facts

Alternative Names

Traditional/Proper Name222 G. Cen
Hipparcos Library I.D.65630
Gould I.D.222
Henry Draper Designation116862

Visual Facts

Star Typesubgiant star
Absolute Magnitude-2.98 / -3.25
Visual / Apparent Magnitude6.27
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 27m 20.66
Declination (Dec.)-49d 22` 52.6
Galactic Latitude13.07 degrees
Galactic Longitude308.92 degrees
1997 Distance from Earth1.41 Parallax (milliarcseconds)
 2313.22 Light Years
 709.22 Parsecs
2007 Revised Distance from Earth1.25 Parallax (milliarcseconds)
 2609.31 Light Years
 800 Parsecs
Proper Motion Dec.-3.56 ± 0.31 milliarcseconds/year
Proper Motion RA.-5.49 ± 0.43 milliarcseconds/year
B-V Index-0.12
Radial Velocity-6.00 ± 4.30 km/s
Spectral TypeB3IV
Colour(B) blue

Variable Star Details

Mean Variability Period in Days0.034
Variable Magnitude Range (Brighter - Dimmer)6.212 - 6.257

Estimated Facts

Calculated Effective Temperature12,367 Kelvin

Sources and Links

SIMBAD SourceLink

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