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V731 Monocerotis, HD47240, HIP31697

V731 Monocerotis is a blue supergiant star that can be located in the constellation of Monoceros. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

V731 Monocerotis's Alternative Names

HIP31697 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD47240.

V731 Monocerotis has alternative name(s) :- , V731 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+05 1334.

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

Location of V731 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 star is compared to the celestial equator and is expressed in degrees. For V731 Monocerotis, the location is 06h 37m 52.70 and +04° 57` 24.0 .

Proper Motion of V731 Monocerotis

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 1.29 ± 0.33 miliarcseconds/year towards the north and -0.37 ± 0.52 miliarcseconds/year east if we saw them in the horizon. The Radial Velocity, that is the speed at which the star is moving away/towards us is 33.00000 km/s with an error of about 4.30 km/s .

Physical Properties (Colour, Temperature) of V731 Monocerotis

V731 Monocerotis has a spectral type of B1Ib. This means the star is a blue supergiant star. The star has a B-V Colour Index of 0.09 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 8,573 Kelvin.

V731 Monocerotis Apparent and Absolute Magnitudes

V731 Monocerotis has an apparent magnitude of 6.14 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 If you used the 2007 Parallax value, you would get an absolute magnitude of -7.98. 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 V731 Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as -0.68 which gave the calculated distance to V731 Monocerotis as -4796.52 light years away from Earth or -1470.59 parsecs. It would take a spaceship travelling at the speed of light, -4796.52 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 0.15 which put V731 Monocerotis at a distance of 21744.22 light years or 6666.67 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. V731 Monocerotis brightness ranges from a magnitude of 6.220 to a magnitude of 6.164 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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V731 Monocerotis Facts

Visual Facts


 V731 Monocerotis
Alternative NamesHD 47240, HIP 31697, BD+05 1334, V731 Mon
Spectral TypeB1Ib
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
Colour blue
GalaxyMilky Way
ConstellationMonoceros
Visual / Apparent Magnitude6.14
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)06h 37m 52.70
Declination (Dec.)+04° 57` 24.0
Galactic Latitude-0.75 degrees
Galactic Longitude206.98 degrees
1997 Distance from Earth-0.68 Parallax (milliarcseconds)
 -4796.52 Light Years
 -1470.59 Parsecs
2007 Distance from Earth0.15 Parallax (milliarcseconds)
 21744.22 Light Years
 6666.67 Parsecs
Proper Motion Dec.1.29 ± 0.33 milliarcseconds/year
Proper Motion RA.-0.37 ± 0.52 milliarcseconds/year
B-V Index0.09
Radial Velocity33.00 ± 4.30 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days2.742
Variable Magnitude Range (Brighter - Dimmer)6.164 - 6.220

Estimated Facts


Calculated Effective Temperature8,573 Kelvin

Sources and Links


SIMBAD SourceLink

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