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AC Horolgii

Primary Facts on AC Horolgii

AC Horolgii's Alternative Names

HIP16070 is the reference name for the star in the Hipparcos Star Catalogue.

AC Horolgii has alternative name(s) :- , AC Hor.

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

Location of AC Horolgii

The location of the variable 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 AC Horolgii, the location is 03h 26m 59.33 and -53° 33` 50.5 .

Physical Properties (Colour, Temperature) of AC Horolgii

AC Horolgii has a spectral type of M0. This means the star is a red variable star. The star has a B-V Colour Index of 1.51 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,993 Kelvin.

AC Horolgii Radius has been calculated as being 65.51 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 45,584,272.69.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 Horolgii Apparent and Absolute Magnitudes

AC Horolgii has an apparent magnitude of 9.06 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 -2.63 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 Horolgii

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.46 which gave the calculated distance to AC Horolgii as 7090.51 light years away from Earth or 2173.91 parsecs. It would take a spaceship travelling at the speed of light, 7090.51 years to get there. We don't have the technology or spaceship that can carry people over that distance yet. AC Horolgii brightness ranges from a magnitude of 9.188 to a magnitude of 9.022 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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Additional AC Horolgii Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAC Horolgii
Alternative NamesHIP 16070, AC Hor
Spectral TypeM0
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
Colour red
GalaxyMilky Way
ConstellationHorologium
Absolute Magnitude -2.63
Visual / Apparent Magnitude9.06
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)03h 26m 59.33
Declination (Dec.)-53° 33` 50.5
Galactic Latitude-51.10 degrees
Galactic Longitude266.50 degrees
Distance from Earth0.46 Parallax (milliarcseconds)
 7090.51 Light Years
 2173.91 Parsecs
 448,398,000.47 Astronomical Units
B-V Index1.51

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.132
Variable Magnitude Range (Brighter - Dimmer)9.022 - 9.188

Estimated Calculated Facts


Radius (x the Sun)65.51
Effective Temperature3,993 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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