Universe Guide


V744 Centauri, HD118767, HIP66666

V744 Centauri is a red pulsating 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.

HIP66666 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD118767. The Id of the star in the Gould Star Catalogue is 246. 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.

V744 Centauri has alternative name(s), V744 Cen.

Location of V744 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 V744 Centauri, the location is 13h 39m 59.90 and -49d57`00.0 .

Proper Motion of V744 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 18.74 ± 0.24 miliarcseconds/year towards the north and -100.11 ± 0.33 miliarcseconds/year east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of V744 Centauri

V744 Centauri has a spectral type of M8III. This means the star is a red giant star. The star is 7300.00000000 Parsecs from the Galactic Centre or terms of Light Years is 23809.9241120000000000s. The star has a B-V Colour Index of 1.49 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,007 Kelvin.

V744 Centauri Radius has been calculated as being 22.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 15,986,477.39.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 21.74. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V744 Centauri Apparent and Absolute Magnitudes

V744 Centauri has an apparent magnitude of 5.74 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 -0.37 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.25. 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 V744 Centauri

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 6.00 which gave the calculated distance to V744 Centauri as 543.61 light years away from Earth or 166.67 parsecs. It would take a spaceship travelling at the speed of light, 543.61 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 6.35 which put V744 Centauri at a distance of 513.64 light years or 157.48 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 7,300.00 Parsecs or 23,809.92 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of V744 Centauri

The star is a pulsating Semiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity variable type which means that its size changes over time. The Variable Type is usually named after the first star of that type to be spotted. V744 Centauri brightness ranges from a magnitude of 6.003 to a magnitude of 5.023 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.9 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.

V744 Centauri Facts

Alternative Names

Traditional/Proper NameV744 Centauri
Short NameV744 Cen
Hipparcos Library I.D.66666
Gould I.D.246
Henry Draper Designation118767

Visual Facts

Star Typegiant star
Absolute Magnitude-0.37 / -0.25
Visual / Apparent Magnitude5.74
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 39m 59.90
Declination (Dec.)-49d57`00.0
Galactic Latitude12.17 degrees
Galactic Longitude310.89 degrees
1997 Distance from Earth6.00 Parallax (milliarcseconds)
 543.61 Light Years
 166.67 Parsecs
2007 Revised Distance from Earth6.35 Parallax (milliarcseconds)
 513.64 Light Years
 157.48 Parsecs
Galacto-Centric Distance23,809.92 Light Years / 7,300.00 Parsecs
Proper Motion Dec.18.74 ± 0.24 milliarcseconds/year
Proper Motion RA.-100.11 ± 0.33 milliarcseconds/year
B-V Index1.49
Radial Velocity-10.70 ± 2.90 km/s
Spectral TypeM8III
Colour(M) Red

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeSemiregular late- (M, C, S or Me, Ce, Se) giants with poorly defined periodicity
Mean Variability Period in Days0.892
Variable Magnitude Range (Brighter - Dimmer)5.023 - 6.003

Estimated Facts

Calculated Effective Temperature4,007 Kelvin

Sources and Links

SIMBAD SourceLink

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