Universe Guide

V741 Monocerotis

V741 Monocerotis Facts

V741 Monocerotis's Alternative Names

HIP32839 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD49935.

V741 Monocerotis has alternative name(s) :- V741 Mon, V741 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 1685.

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

Location of V741 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 V741 Monocerotis, the location is 06h 50m 43.27 and -04° 15` 58.4 .

Proper Motion of V741 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 -3.40 ± 0.34 milliarcseconds/year towards the north and -7.78 ± 0.50 milliarcseconds/year east if we saw them in the horizon. . 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.

V741 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 139.46 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 V741 Monocerotis

V741 Monocerotis Colour and Temperature

V741 Monocerotis has a spectral type of B8. This means the star is a blue variable star. The star has a B-V Colour Index of -0.08 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 12,939 Kelvin.

V741 Monocerotis Radius

Radius has been calculated as being 1.55 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 1,075,430.82.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 1.88. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

V741 Monocerotis Apparent and Absolute Magnitudes

V741 Monocerotis has an apparent magnitude of 6.87 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 0.40 If you used the 2007 Parallax value, you would get an absolute magnitude of -0.02. 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 V741 Monocerotis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.07 which gave the calculated distance to V741 Monocerotis as 643.32 light years away from Earth or 197.24 parsecs. It would take a spaceship travelling at the speed of light, 643.32 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 4.19 which put V741 Monocerotis at a distance of 778.43 light years or 238.66 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 49,226,815.64 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.

The star's Galacto-Centric Distance is 7,589.00 Parsecs or 24,752.54 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 V741 Monocerotis

The star is a rotating Alpha2 Canum Venatic 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. V741 Monocerotis brightness ranges from a magnitude of 6.881 to a magnitude of 6.844 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 1.1 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 V741 Monocerotis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameV741 Monocerotis
Alternative NamesV741 Mon, HD 49935, HIP 32839, BD-04 1685, V741 Mon
Spectral TypeB8
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
GalaxyMilky Way
Absolute Magnitude 0.40 / -0.02
Visual / Apparent Magnitude6.87
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 50m 43.27
Declination (Dec.)-04° 15` 58.4
Galactic Latitude-2.10 degrees
Galactic Longitude216.65 degrees
1997 Distance from Earth5.07 Parallax (milliarcseconds)
 643.32 Light Years
 197.24 Parsecs
2007 Distance from Earth4.19 Parallax (milliarcseconds)
 778.43 Light Years
 238.66 Parsecs
 49,226,815.64 Astronomical Units
Galacto-Centric Distance24,752.54 Light Years / 7,589.00 Parsecs
Proper Motion Dec.-3.40 ± 0.34 milliarcseconds/year
Proper Motion RA.-7.78 ± 0.50 milliarcseconds/year
B-V Index-0.08
Stellar Luminosity (Lsun)139.46

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Variable Star Details

Variable Star ClassRotating
Variable Star TypeAlpha2 Canum Venatic
Mean Variability Period in Days1.144
Variable Magnitude Range (Brighter - Dimmer)6.844 - 6.881

Estimated Calculated Facts

Radius (x the Sun)1.88
Effective Temperature12,939 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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