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275 G. Centauri, HD120457, HIP67537

275 G. Centauri is a orange to red giant star that can be located in the constellation of Centaurus. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. 275 G. Centauri has at least 1 Extrasolar Planets believed to be in orbit around the star.

275 G. Centauri's Alternative Names

HIP67537 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD120457.

The Gould star designation is one that was designed by American astronomer, Benjamin Apthorp Gould. Gould stars are predominantly in the Southern and Equatorial constellations but do appear in northern constellations such as Bootes and Orion. The star has the designation 275 G. Centauri. There are no stars with a Gould designation in Ursa Major for example.

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

Location of 275 G. 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 275 G. Centauri, the location is 13h 50m 19.39 and -39° 54` 03.0 .

Proper Motion of 275 G. 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 -9.63 ± 0.26 miliarcseconds/year towards the north and 5.45 ± 0.46 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is -3.80000 km/s with an error of about 0.40 km/s .

275 G. 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 40.66 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature, Metallicity, Mass) of 275 G. Centauri

275 G. Centauri has a spectral type of K1III. This means the star is a orange to red giant star. The star is 7,327.00 Parsecs from the Galactic Centre or terms of Light Years is 23,897.99 s. The star has a B-V Colour Index of 0.99 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,868 Kelvin.

275 G. Centauri Radius has been calculated as being 7.66 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,329,361.80.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 7.66. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's solar mass is 2.41 times that of the Sun's. The Sun's Mass is 1,989,100,000,000,000,000,000 billion kg. which to calculate using this website is too large. To give idea of size, the Sun is 99.86% the mass of the solar system.

The star's metallicity is 0.150000, this value is the fractional amount of the star that is not Hydrogen (X) or Helium (Y). An older star would have a high metallicity whereas a new star would have a lower one.

275 G. Centauri Apparent and Absolute Magnitudes

275 G. Centauri has an apparent magnitude of 6.43 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 1.17 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.17. 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 275 G. Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.89 which gave the calculated distance to 275 G. Centauri as 366.89 light years away from Earth or 112.49 parsecs. It would take a spaceship travelling at the speed of light, 366.89 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 8.88 which put 275 G. Centauri at a distance of 367.30 light years or 112.61 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 7,327.00 Parsecs or 23,897.99 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.

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275 G. Centauri Facts

Visual Facts

Primary / Proper / Traditional Name275 G. Centauri
Alternative NamesHD 120457, HIP 67537
Spectral TypeK1III
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
Absolute Magnitude1.17 / 1.17
Visual / Apparent Magnitude6.43
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 50m 19.39
Declination (Dec.)-39° 54` 03.0
Galactic Latitude21.58 degrees
Galactic Longitude315.03 degrees
1997 Distance from Earth8.89 Parallax (milliarcseconds)
 366.89 Light Years
 112.49 Parsecs
2007 Distance from Earth8.88 Parallax (milliarcseconds)
 367.30 Light Years
 112.61 Parsecs
Galacto-Centric Distance23,897.99 Light Years / 7,327.00 Parsecs
Proper Motion Dec.-9.63 ± 0.26 milliarcseconds/year
Proper Motion RA.5.45 ± 0.46 milliarcseconds/year
B-V Index0.99
Radial Velocity-3.80 ± 0.40 km/s
Semi-Major Axis8577.00
Stellar Luminosity (Lsun)40.66

Companions (Multi-Star and Exoplanets) Facts

Exoplanet Count1

Estimated Facts

Calculated Effective Temperature4,868 Kelvin
Mass Compared to the Sun2.41

Sources and Links

SIMBAD SourceLink

List of Extrasolar Planets orbiting 275 G. Centauri

NameStatusMass (Jupiters)Orbital Period (Days)EccentricityDiscoveredSemi-Major AxisPeriastronInclination
HIP 67537 bConfirmed0.62592.5000.5920164.96120.7002016.000

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