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203 G. Centauri

203 G. Centauri Facts

  • 203 G. Centauri is a supergiant star that can be located in the constellation of Centaurus. The description is based on the spectral class.
  • 203 G. Centauri is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B0.5Ia) of the star, the star's colour is blue .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 5017.90 light years away from us. Distance

203 G. Centauri's Alternative Names

HIP65129 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD115842.

203 G. Centauri has alternative name(s) :- , NSV 06193.

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 203 G. Centauri. There are no stars with a Gould designation in Ursa Major for example.

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

Location of 203 G. Centauri

The location of the supergiant 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 object is compared to the celestial equator and is expressed in degrees. For 203 G. Centauri, the location is 13h 20m 48.34 and -55° 48` 02.5 .

Radial Velocity and Proper Motion of 203 G. Centauri

Proper Motion

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 3.93 ± 0.30 milliarcseconds/year towards the north and -3.04 ± 0.44 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -3.00000 km/s with an error of about 4.30 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of 203 G. Centauri

203 G. Centauri Colour and Temperature

Based on the star's spectral type of B0.5Ia , 203 G. Centauri's colour and type is blue supergiant star. The star has a B-V Colour Index of 0.23 which means the star's temperature is about 7,184 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

203 G. Centauri Apparent and Absolute Magnitudes

203 G. Centauri has an apparent magnitude of 6.00 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 -4.94. 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 203 G. Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.00000 which gave the calculated distance to 203 G. Centauri as 0 light years away from Earth or 0 parsecs. If you want that in miles, it is about 0.00, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 0.65000 which put 203 G. Centauri at a distance of 5017.90 light years or 1538.46 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.

Using the 2007 distance, the star is roughly 317,327,942.65 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to 203 G. Centauri

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking4841,271,795,664.78
Car12028,042,393,188.83
Airbus A3807364,572,129,324.27
Speed of Sound (Mach 1)767.2694,385,798,439.22
Concorde (Mach 2)1,534.542,192,896,361.55
New Horizons Probe33,000101,972,338.87
Speed of Light670,616,629.005,017.90
203 G. Centauri brightness ranges from a magnitude of 6.127 to a magnitude of 6.062 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.

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Additional 203 G. Centauri Facts and Figures

Visual Facts


Primary / Proper / Traditional Name203 G. Centauri
Alternative NamesHD 115842, HIP 65129, NSV 06193
Spectral TypeB0.5Ia
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourBlue
GalaxyMilky Way
ConstellationCentaurus
Absolute Magnitude / -4.94
Visual / Apparent Magnitude6.00
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 20m 48.34
Declination (Dec.)-55° 48` 02.5
Galactic Latitude6.83431895 degrees
Galactic Longitude307.08042542 degrees
1997 Distance from Earth0.00000 Parallax (milliarcseconds)
 0 Light Years
 0 Parsecs
2007 Distance from Earth0.65000 Parallax (milliarcseconds)
 5017.90 Light Years
 1538.46 Parsecs
 317,327,942.65 Astronomical Units
Proper Motion Dec.3.93000 ± 0.30000 milliarcseconds/year
Proper Motion RA.-3.04000 ± 0.44000 milliarcseconds/year
B-V Index0.23
Radial Velocity-3.00000 ± 4.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.053
Variable Magnitude Range (Brighter - Dimmer)6.062 - 6.127

Estimated Calculated Facts


Effective Temperature7,184 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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