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CF Tucanae

CF Tucanae Facts

CF Tucanae's Alternative Names

HIP4157 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD5303.

CF Tucanae has alternative name(s) :- CF Tuc, CF Tuc.

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

Location of CF Tucanae

The location of the main sequence 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 CF Tucanae, the location is 00h 53m 07.23 and -74° 39` 05.8 .

Radial Velocity and Proper Motion of CF Tucanae

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 20.30 ± 0.49 milliarcseconds/year towards the north and 243.17 ± 0.55 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 0.50 km/s with an error of about 1.60 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.

CF Tucanae 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 6.75 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) of CF Tucanae

CF Tucanae Colour and Temperature

CF Tucanae has a spectral type of G2/5V + F0. This means the star is a white to yellow main sequence star. The star has a B-V Colour Index of 0.6 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,895 Kelvin.

CF Tucanae Radius

Radius has been calculated as being 2.32 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,615,814.30.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 2.41. 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 9.99 Fe/H with the Sun has a value of 1 to put it into context.

CF Tucanae Apparent and Absolute Magnitudes

CF Tucanae has an apparent magnitude of 7.61 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 2.93 If you used the 2007 Parallax value, you would get an absolute magnitude of 2.85. 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 CF Tucanae

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.60 which gave the calculated distance to CF Tucanae as 281.18 light years away from Earth or 86.21 parsecs. It would take a spaceship travelling at the speed of light, 281.18 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 11.19 which put CF Tucanae at a distance of 291.48 light years or 89.37 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 18,433,757.29 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.

The star's Galacto-Centric Distance is 7,365.00 Parsecs or 24,021.93 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 CF Tucanae

The star is a eclipsing Beta Persei (Algol)/ 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. CF Tucanae brightness ranges from a magnitude of 8.020 to a magnitude of 7.660 over its variable period. The smaller the magnitude, the brighter the star.

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 CF Tucanae Facts and Figures

Visual Facts


Primary / Proper / Traditional NameCF Tucanae
Alternative NamesCF Tuc, HD 5303, HIP 4157, CF Tuc
Spectral TypeG2/5V + F0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type Main Sequence Dwarf Star
ColourWhite to Yellow
GalaxyMilky Way
ConstellationTucana
Absolute Magnitude 2.93 / 2.85
Visual / Apparent Magnitude7.61
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)00h 53m 07.23
Declination (Dec.)-74° 39` 05.8
Galactic Latitude-42.48 degrees
Galactic Longitude302.78 degrees
1997 Distance from Earth11.60 Parallax (milliarcseconds)
 281.18 Light Years
 86.21 Parsecs
2007 Distance from Earth11.19 Parallax (milliarcseconds)
 291.48 Light Years
 89.37 Parsecs
 18,433,757.29 Astronomical Units
Galacto-Centric Distance24,021.93 Light Years / 7,365.00 Parsecs
Proper Motion Dec.20.30 ± 0.49 milliarcseconds/year
Proper Motion RA.243.17 ± 0.55 milliarcseconds/year
B-V Index0.60
Radial Velocity0.50 ± 1.60 km/s
Iron Abundance-0.69 ± 9.99 Fe/H
Eccentricity0.43
Semi-Major Axis5549.00
Stellar Luminosity (Lsun)6.75

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/
Variable Magnitude Range (Brighter - Dimmer)7.660 - 8.020

Estimated Calculated Facts


Radius (x the Sun)2.41
Effective Temperature5,895 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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