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AO Monocerotis

AO Monocerotis Facts

  • AO Monocerotis is a eclipsing binary sys star that can be located in the constellation of Monoceros. The description is based on the spectral class.
  • AO Monocerotis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (B3 + B5) of the star, the star's colour is blue .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star is calculated at being about -3294.58 light years away from us. Distance

AO Monocerotis's Alternative Names

HIP34299 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD53883.

AO Monocerotis has alternative name(s) :- AO Mon, AO Mon.

BD number is the number that the star was filed under in the Durchmusterung or Bonner Durchmusterung, a star catalogue that was put together by the Bonn Observatory between 1859 to 1903. The star's BD Number is BD-04 1822.

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

Location of AO Monocerotis

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 object is compared to the celestial equator and is expressed in degrees. For AO Monocerotis, the location is 07h 06m 36.30 and -04° 37` 24.5 .

Physical Properties of AO Monocerotis

AO Monocerotis Colour and Temperature

Based on the star's spectral type of B3 + B5 , AO Monocerotis's colour and type is blue star. The star has a B-V Colour Index of -0.05 which means the star's temperature is about 11,775 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu.

AO Monocerotis Apparent and Absolute Magnitudes

AO Monocerotis has an apparent magnitude of 9.61 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 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 Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.99000 which gave the calculated distance to AO Monocerotis as -3294.58 light years away from Earth or -1010.10 parsecs. If you want that in miles, it is about -19,367,601,581,983,257.83, based on 1 Ly = 5,878,625,373,183.61 miles.

Variable Type of AO Monocerotis

The star is a eclipsing binary sys Beta Persei (Algol) 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 Monocerotis brightness ranges from a magnitude of 10.110 to a magnitude of 9.540 over its variable period. The smaller the magnitude, the brighter the star.

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 Monocerotis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAO Monocerotis
Alternative NamesAO Mon, HD 53883, HIP 34299, BD-04 1822, AO Mon
Spectral TypeB3 + B5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourBlue
GalaxyMilky Way
ConstellationMonoceros
Visual / Apparent Magnitude9.61
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)07h 06m 36.30
Declination (Dec.)-04° 37` 24.5
Galactic Latitude1.25535518 degrees
Galactic Longitude218.77592422 degrees
Distance from Earth-0.99000 Parallax (milliarcseconds)
 -3294.58 Light Years
 -1010.10 Parsecs
 -208,346,629.01 Astronomical Units
B-V Index-0.05
Radial Velocity15.00000 ± 7.40 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing binary sys
Variable Star TypeBeta Persei (Algol)
Variable Magnitude Range (Brighter - Dimmer)9.540 - 10.110

Estimated Calculated Facts


Effective Temperature11,775 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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