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AO Doradus

AO Doradus Facts

  • AO Doradus is a giant star that can be located in the constellation of Dorado. The description is based on the spectral class.
  • AO Doradus is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (M3III) 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.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 2117.94 light years away from us. Distance

AO Doradus's Alternative Names

HIP23374 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD32972.

AO Doradus has alternative name(s) :- , AO Dor.

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

Location of AO Doradus

The location of the giant 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 Doradus, the location is 05h 01m 32.77 and -68° 01` 43.6 .

Radial Velocity and Proper Motion of AO Doradus

Proper Motion

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 22.77 ± 0.49 milliarcseconds/year towards the north and 6.23 ± 0.48 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is 9.00000 km/s with an error of about 1.30 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of AO Doradus

AO Doradus Temperature and Colour

Based on the star's spectral type of M3III , AO Doradus's colour and type is red giant star. The star has a B-V Colour Index of 1.52 which means the star's temperature is about 3,952 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AO Doradus Radius

AO Doradus estimated radius has been calculated as being 40.30 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 28,039,416.98.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 29.599063952908420731197912694. 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 Doradus Apparent and Absolute Magnitudes

AO Doradus has an apparent magnitude of 8.20 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 -1.53 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.86. 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 Doradus

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 1.13000 which gave the calculated distance to AO Doradus as 2886.40 light years away from Earth or 884.96 parsecs. If you want that in miles, it is about 16,968,064,277,157,171.90, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 1.54000 which put AO Doradus at a distance of 2117.94 light years or 649.35 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.

Using the 2007 distance, the star is roughly 133,937,118.65 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun.

Travel Time to AO Doradus

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)
Walking4355,081,445,806.07
Car12011,836,048,193.54
Airbus A3807361,929,790,466.34
Speed of Sound (Mach 1)767.2691,851,144,491.99
Concorde (Mach 2)1,534.54925,571,039.68
New Horizons Probe33,00043,040,175.25
Speed of Light670,616,629.002,117.94
AO Doradus brightness ranges from a magnitude of 8.285 to a magnitude of 8.168 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 AO Doradus Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAO Doradus
Alternative NamesHD 32972, HIP 23374, AO Dor
Spectral TypeM3III
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourRed
GalaxyMilky Way
ConstellationDorado
Absolute Magnitude -1.53 / -0.86
Visual / Apparent Magnitude8.20
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)05h 01m 32.77
Declination (Dec.)-68° 01` 43.6
Galactic Latitude-35.20337191 degrees
Galactic Longitude278.96263775 degrees
1997 Distance from Earth1.13000 Parallax (milliarcseconds)
 2886.40 Light Years
 884.96 Parsecs
2007 Distance from Earth1.54000 Parallax (milliarcseconds)
 2117.94 Light Years
 649.35 Parsecs
 133,937,118.65 Astronomical Units
Proper Motion Dec.22.77000 ± 0.49000 milliarcseconds/year
Proper Motion RA.6.23000 ± 0.48000 milliarcseconds/year
B-V Index1.52
Radial Velocity9.00000 ± 1.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.095
Variable Magnitude Range (Brighter - Dimmer)8.168 - 8.285

Estimated Calculated Facts


Radius (x the Sun)29.60
Effective Temperature3,952 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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