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269 G. Cen - HD119971 - HIP67304

269 G. Cen is a orange to red giant 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.

HIP67304 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD119971. The Id of the star in the Gould Star Catalogue is 269. 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 269 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 269 G. Cen, the location is 13h 47m 38.67 and -50d19`14.4 .

Proper Motion of 269 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 -6.03 ± 0.18 miliarcseconds/year towards the north and -141.33 ± 0.31 miliarcseconds/year east if we saw them in the horizon.

269 G. Cen 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 70.0000000 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 269 G. Cen

269 G. Cen has a spectral type of K2III. This means the star is a orange to red giant star. The star is 7301.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23813.1857454400000000s. The star has a B-V Colour Index of 1.35 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,241 Kelvin.

269 G. Cen Radius has been calculated as being 19.50 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 13,566,063.26.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 21.38. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.69 with an error value of 0.05 Fe/H with the Sun has a value of 1 to put it into context.

269 G. Cen Apparent and Absolute Magnitudes

269 G. Cen has an apparent magnitude of 5.46 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 -0.26 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.46. 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 269 G. Cen

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.18 which gave the calculated distance to 269 G. Cen as 454.27 light years away from Earth or 139.28 parsecs. It would take a spaceship travelling at the speed of light, 454.27 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 6.55 which put 269 G. Cen at a distance of 497.96 light years or 152.67 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.

The star's Galacto-Centric Distance is 7,301.00 Parsecs or 23,813.19 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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.

269 G. Cen Facts

Alternative Names

Traditional/Proper Name269 G. Cen
Hipparcos Library I.D.67304
Gould I.D.269
Henry Draper Designation119971

Visual Facts

Star Typegiant star
Absolute Magnitude-0.26 / -0.46
Visual / Apparent Magnitude5.46
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)13h 47m 38.67
Declination (Dec.)-50d19`14.4
Galactic Latitude11.55 degrees
Galactic Longitude312.04 degrees
1997 Distance from Earth7.18 Parallax (milliarcseconds)
 454.27 Light Years
 139.28 Parsecs
2007 Revised Distance from Earth6.55 Parallax (milliarcseconds)
 497.96 Light Years
 152.67 Parsecs
Galacto-Centric Distance23,813.19 Light Years / 7,301.00 Parsecs
Proper Motion Dec.-6.03 ± 0.18 milliarcseconds/year
Proper Motion RA.-141.33 ± 0.31 milliarcseconds/year
B-V Index1.35
Radial Velocity28.10 ± 0.80 km/s
Iron Abundance-0.69 ± 0.05 Fe/H
Spectral TypeK2III
Colour(K) Orange to Red

Estimated Facts

Luminosity (x the Sun)70.0000000
Calculated Effective Temperature4,241 Kelvin

Sources and Links

SIMBAD SourceLink

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