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Sigma Fornacis, HD23738, HIP17618, HR1171

Sigma Fornacis is a blue main sequence dwarf star that can be located in the constellation of Fornax. 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.

Sigma Fornacis's Alternative Names

Sigma Fornacis (Sig For) is the Bayer Classification for the star. The Id of the star in the Yale Bright Star Catalogue is HR1171. HIP17618 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD23738.

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

Location of Sigma Fornacis

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 Sigma Fornacis, the location is 03h 46m 27.42 and -29° 20` 17.4 .

Proper Motion of Sigma 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 4.06 ± 0.22 miliarcseconds/year towards the north and 6.87 ± 0.36 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 -13.90000 km/s with an error of about 0.80 km/s .

Sigma 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 37.27 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 Sigma Fornacis

Sigma Fornacis has a spectral type of A2V. This means the star is a blue main sequence dwarf star. The star is 7,443.00 Parsecs from the Galactic Centre or terms of Light Years is 24,276.34 s. The star has a B-V Colour Index of 0.11 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,375 Kelvin.

Sigma Fornacis Radius has been calculated as being 2.94 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,048,374.97.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

Sigma Fornacis Apparent and Absolute Magnitudes

Sigma Fornacis has an apparent magnitude of 5.91 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. Using the supplied Parallax value, you would get an absolute magnitude of 0.89 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 Sigma Fornacis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 9.90 which gave the calculated distance to Sigma Fornacis as 329.46 light years away from Earth or 101.01 parsecs. It would take a spaceship travelling at the speed of light, 329.46 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star's Galacto-Centric Distance is 7,443.00 Parsecs or 24,276.34 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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Sigma Fornacis Facts

Visual Facts


 Sigma Fornacis
Alternative NamesSig For, HD 23738, HIP 17618, HR 1171
Spectral TypeA2V
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue
GalaxyMilky Way
ConstellationFornax
Absolute Magnitude0.89
Visual / Apparent Magnitude5.91
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)03h 46m 27.42
Declination (Dec.)-29° 20` 17.4
Galactic Latitude-51.61 degrees
Galactic Longitude226.81 degrees
Distance from Earth9.90 Parallax (milliarcseconds)
 329.46 Light Years
 101.01 Parsecs
Galacto-Centric Distance24,276.34 Light Years / 7,443.00 Parsecs
Proper Motion Dec.4.06 ± 0.22 milliarcseconds/year
Proper Motion RA.6.87 ± 0.36 milliarcseconds/year
B-V Index0.11
Radial Velocity-13.90 ± 0.80 km/s
Eccentricity0.23
Semi-Major Axis9286.00
Stellar Luminosity (Lsun)37.27

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature8,375 Kelvin

Sources and Links


SIMBAD SourceLink

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