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BE Monocerotis

BE Monocerotis Facts

BE Monocerotis's Alternative Names

HIP31905 is the reference name for the star in the Hipparcos Star Catalogue.

BE Monocerotis has alternative name(s) :- BE Mon, BE 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+07 1394.

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

Location of BE Monocerotis

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 BE Monocerotis, the location is 06h 40m 05.58 and +07° 36` 21.0 .

Physical Properties (Colour, Temperature) of BE Monocerotis

BE Monocerotis Colour and Temperature

BE Monocerotis has a spectral type of F6.7. This means the star is a blue to white variable star. The star has a B-V Colour Index of 1.14 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,683 Kelvin.

BE Monocerotis Apparent and Absolute Magnitudes

BE Monocerotis has an apparent magnitude of 10.50 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 BE Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.28 which gave the calculated distance to BE Monocerotis as -11648.69 light years away from Earth or -3571.43 parsecs. It would take a spaceship travelling at the speed of light, -11648.69 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of BE Monocerotis

The star is a pulsating Delta Cepheid 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. BE Monocerotis brightness ranges from a magnitude of 10.993 to a magnitude of 10.395 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 2.7 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 BE Monocerotis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBE Monocerotis
Alternative NamesBE Mon, HIP 31905, BD+07 1394, BE Mon
Spectral TypeF6.7
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
ConstellationMonoceros
Visual / Apparent Magnitude10.50
Naked Eye VisibleRequires a 4.5 - 6 Inch Telescope - Magnitudes
Right Ascension (R.A.)06h 40m 05.58
Declination (Dec.)+07° 36` 21.0
Galactic Latitude0.96 degrees
Galactic Longitude204.87 degrees
Distance from Earth-0.28 Parallax (milliarcseconds)
 -11648.69 Light Years
 -3571.43 Parsecs
 -736,655,183.89 Astronomical Units
B-V Index1.14
Radial Velocity45.30 ± 0.60 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days2.706
Variable Magnitude Range (Brighter - Dimmer)10.395 - 10.993

Estimated Calculated Facts


Effective Temperature4,683 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


Comments and Questions

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