Universe Guide


UX Fornacis, HD17084, HIP12716

UX Fornacis is a white to yellow eclipsing binary system main sequence dwarf star that can be located in the constellation of Fornax. The star can not be seen by the naked eye, you need a telescope to see it.

HIP12716 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD17084.

UX Fornacis has alternative name(s), UX For.

Location of UX Fornacis

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 UX Fornacis, the location is 02h 43m 25.51 and -37d55`41.9 .

Proper Motion of UX Fornacis

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 -73.14 ± 0.48 miliarcseconds/year towards the north and 78.81 ± 0.67 miliarcseconds/year east if we saw them in the horizon.

UX Fornacis 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 1.0000000 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 UX Fornacis

UX Fornacis has a spectral type of G5/8V + (G). This means the star is a white to yellow main sequence dwarf star. The star is 7408.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24162.1805235200000000s. The star has a B-V Colour Index of 0.74 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,446 Kelvin.

UX Fornacis Radius has been calculated as being 1.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 726,412.60.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.05. 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 -0.34 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

UX Fornacis Apparent and Absolute Magnitudes

UX Fornacis has an apparent magnitude of 8.04 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 5.01 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.99. 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 UX Fornacis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 24.77 which gave the calculated distance to UX Fornacis as 131.68 light years away from Earth or 40.37 parsecs. It would take a spaceship travelling at the speed of light, 131.68 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 24.58 which put UX Fornacis at a distance of 132.69 light years or 40.68 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 7,408.00 Parsecs or 24,162.18 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 UX Fornacis

The star is a eclipsing binary system RS Canum Venaticorum 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. UX Fornacis brightness ranges from a magnitude of 8.212 to a magnitude of 8.148 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.0 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.

UX Fornacis Facts

Alternative Names

Traditional/Proper NameUX Fornacis
Short NameUX For
Hipparcos Library I.D.12716
Henry Draper Designation17084

Visual Facts

Star Typemain sequence dwarf star
Absolute Magnitude5.01 / 4.99
Visual / Apparent Magnitude8.04
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 43m 25.51
Declination (Dec.)-37d55`41.9
Galactic Latitude-64.18 degrees
Galactic Longitude244.72 degrees
1997 Distance from Earth24.77 Parallax (milliarcseconds)
 131.68 Light Years
 40.37 Parsecs
2007 Revised Distance from Earth24.58 Parallax (milliarcseconds)
 132.69 Light Years
 40.68 Parsecs
Galacto-Centric Distance24,162.18 Light Years / 7,408.00 Parsecs
Proper Motion Dec.-73.14 ± 0.48 milliarcseconds/year
Proper Motion RA.78.81 ± 0.67 milliarcseconds/year
B-V Index0.74
Radial Velocity20.30 ± 0.70 km/s
Iron Abundance-0.34 ± 9.99 Fe/H
Spectral TypeG5/8V + (G)
Colour(G) White to Yellow

Variable Star Details

Variable Star ClassEclipsing binary system
Variable Star TypeRS Canum Venaticorum
Mean Variability Period in Days0.041
Variable Magnitude Range (Brighter - Dimmer)8.148 - 8.212

Estimated Facts

Luminosity (x the Sun)1.0000000
Calculated Effective Temperature5,446 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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