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AU Monocerotis

AU Monocerotis Facts

AU Monocerotis's Alternative Names

HIP33237 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD50846.

AU Monocerotis has alternative name(s) :- AU Mon, AU 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-01 1449.

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

Location of AU 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 AU Monocerotis, the location is 06h 54m 54.71 and -01° 22` 32.9 .

AU Monocerotis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 253.58 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature) of AU Monocerotis

AU Monocerotis Colour and Temperature

AU Monocerotis has a spectral type of B5 + F0 EA. This means the star is a blue star. The star has a B-V Colour Index of 0.03 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 9,610 Kelvin.

AU Monocerotis Radius

Radius has been calculated as being 8.23 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 5,727,434.10.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.

AU Monocerotis Apparent and Absolute Magnitudes

AU Monocerotis has an apparent magnitude of 8.36 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 -1.94 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 AU Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.87 which gave the calculated distance to AU Monocerotis as 3749.00 light years away from Earth or 1149.43 parsecs. It would take a spaceship travelling at the speed of light, 3749.00 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

The star's Galacto-Centric Distance is 8,053.00 Parsecs or 26,265.93 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of AU Monocerotis

The star is a eclipsing 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. AU Monocerotis brightness ranges from a magnitude of 9.070 to a magnitude of 8.170 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 AU Monocerotis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameAU Monocerotis
Alternative NamesAU Mon, HD 50846, HIP 33237, BD-01 1449, AU Mon
Spectral TypeB5 + F0 EA
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeStar
ColourBlue
GalaxyMilky Way
ConstellationMonoceros
Absolute Magnitude -1.94
Visual / Apparent Magnitude8.36
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 54m 54.71
Declination (Dec.)-01° 22` 32.9
Galactic Latitude0.15 degrees
Galactic Longitude214.55 degrees
Distance from Earth0.87 Parallax (milliarcseconds)
 3749.00 Light Years
 1149.43 Parsecs
 237,085,304.21 Astronomical Units
Galacto-Centric Distance26,265.93 Light Years / 8,053.00 Parsecs
B-V Index0.03
Radial Velocity17.00 ± 2.50 km/s
Eccentricity0.18
Semi-Major Axis9553.00
Stellar Luminosity (Lsun)253.58

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/
Variable Magnitude Range (Brighter - Dimmer)8.170 - 9.070

Estimated Calculated Facts


Radius (x the Sun)8.23
Effective Temperature9,610 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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