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AC Fornacis, HD16119, HIP11970

AC Fornacis is a orange to red giant star that can be located in the constellation of Fornax. The description is based on the spectral class. AC Fornacis is not part of the constellation but is within the borders of the constellation.

The star can not be seen by the naked eye, you need a telescope to see it.

AC Fornacis's Alternative Names

HIP11970 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD16119.

AC Fornacis has alternative name(s) :- , AC For.

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

Location of AC 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 AC Fornacis, the location is 02h 34m 25.59 and -32° 43` 06.3 .

Physical Properties (Colour, Temperature) of AC Fornacis

AC Fornacis has a spectral type of K5III. This means the star is a orange to red giant star. 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.

AC Fornacis Radius has been calculated as being 448.06 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 311,756,919.09.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.

AC Fornacis Apparent and Absolute Magnitudes

AC Fornacis has an apparent magnitude of 8.41 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 -6.82 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 AC Fornacis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.09 which gave the calculated distance to AC Fornacis as 36240.37 light years away from Earth or 11111.11 parsecs. It would take a spaceship travelling at the speed of light, 36240.37 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. AC Fornacis brightness ranges from a magnitude of 8.592 to a magnitude of 8.494 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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AC Fornacis Facts

Visual Facts


Primary / Proper / Traditional NameAC Fornacis
Alternative NamesHD 16119, HIP 11970, AC For
Spectral TypeK5III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
Colour orange to red
GalaxyMilky Way
ConstellationFornax
Absolute Magnitude -6.82
Visual / Apparent Magnitude8.41
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)02h 34m 25.59
Declination (Dec.)-32° 43` 06.3
Galactic Latitude-67.06 degrees
Galactic Longitude233.27 degrees
Distance from Earth0.09 Parallax (milliarcseconds)
 36240.37 Light Years
 11111.11 Parsecs
B-V Index1.49

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.073
Variable Magnitude Range (Brighter - Dimmer)8.494 - 8.592

Estimated Facts


Calculated Effective Temperature4,007 Kelvin

Sources and Links


SIMBAD SourceLink

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