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AO Crucis

AO Crucis Facts

  • AO Crucis is a pulsating supergiant star that can be located in the constellation of Crux. The description is based on the spectral class.
  • AO Crucis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M0Ia/Iab) of the star, the star's colour is red .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about 14825.61 light years away from us. Distance

AO Crucis's Alternative Names

HIP59943 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD106873.

AO Crucis has alternative name(s) :- , AO Cru.

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

Location of AO Crucis

The location of the supergiant 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 AO Crucis, the location is 12h 17m 45.76 and -63° 36` 58.1 .

Physical Properties of AO Crucis

AO Crucis Colour and Temperature

Based on the star's spectral type of M0Ia/Iab , AO Crucis's colour and type is red supergiant star. The star has a B-V Colour Index of 2.09 which means the star's temperature is about 1,243 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AO Crucis Radius

AO Crucis estimated radius has been calculated as being 3,006.21 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,091,718,328.32.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 rather than peer reviewed papers. It has been known to produce widely incorrect figures.

AO Crucis Apparent and Absolute Magnitudes

AO Crucis has an apparent magnitude of 7.42 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 -5.87 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 AO Crucis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.22000 which gave the calculated distance to AO Crucis as 14825.61 light years away from Earth or 4545.45 parsecs. If you want that in miles, it is about 87,154,207,118,924,660.25, based on 1 Ly = 5,878,625,373,183.61 miles.

Travel Time to AO Crucis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking42,485,575,150,267.17
Car12082,852,505,008.91
Airbus A38073613,508,560,599.28
Speed of Sound (Mach 1)767.26912,958,037,664.85
Concorde (Mach 2)1,534.546,479,010,388.17
New Horizons Probe33,000301,281,836.40
Speed of Light670,616,629.0014,825.61

Variable Type of AO Crucis

The star is a pulsating Slow Irregular 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. AO Crucis brightness ranges from a magnitude of 7.503 to a magnitude of 7.232 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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 AO Crucis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAO Crucis
Alternative NamesHD 106873, HIP 59943, AO Cru
Spectral TypeM0Ia/Iab
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourRed
GalaxyMilky Way
ConstellationCrux
Absolute Magnitude -5.87
Visual / Apparent Magnitude7.42
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)12h 17m 45.76
Declination (Dec.)-63° 36` 58.1
Galactic Latitude-0.98860578 degrees
Galactic Longitude299.20099346 degrees
Distance from Earth0.22000 Parallax (milliarcseconds)
 14825.61 Light Years
 4545.45 Parsecs
 937,559,830.55 Astronomical Units
B-V Index2.09

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.237
Variable Magnitude Range (Brighter - Dimmer)7.232 - 7.503

Estimated Calculated Facts


Radius (x the Sun)3,006.21
Effective Temperature1,243 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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