Universe Guide


Epsilon Monocerotis B - HD11131 - HIP8486

Epsilon Monocerotis B is a white to yellow star that can be located in the constellation of Monoceros. Epsilon Monocerotis B is the Bayer Classification for the star. HIP8486 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD11131. Epsilon Monocerotis B has alternative name(s), 53 Ceti , 53 Cet.

Location of Epsilon Monocerotis B

The location of the star in the galaxy 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 Epsilon Monocerotis B, the location is 01h 49m 23.43 and -10d42`11.9 .

Proper Motion of Epsilon Monocerotis B

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 -105.82 ± 002.03 towards the north and -124.54 ± 003.02 east if we saw them in the horizon.

Physical Properties (Colour, Temperature, Radius) of Epsilon Monocerotis B

Epsilon Monocerotis B has a spectral type of G0. This means the star is a white to yellow star. The star has a B-V Colour Index of 0.65 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,761 Kelvin.

Epsilon Monocerotis B has been calculated as 0.98 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 679,741.64.km.

The star has a companion star which is in orbit close by, it has at least the following companions in close orbit, Epsilon Monocerotis.

Epsilon Monocerotis B Apparent and Absolute Magnitudes

Epsilon Monocerotis B has an apparent magnitude of 6.72 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 4.91 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.95. 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 Epsilon Monocerotis B

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 43.47 which gave the calculated distance to Epsilon Monocerotis B as 75.03 light years away from Earth or 23.00 parsecs. It would take a spaceship travelling at the speed of light, 75.03 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 44.32 which put Epsilon Monocerotis B at a distance of 73.59 light years or 22.56 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.

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 Stellar Age, Metallicity or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Epsilon Monocerotis B Facts

Alternative Names

Short Name53 Cet
Bayer DesignationEpsilon Monocerotis B
Alternative Name(s)53 Ceti
Hipparcos Library I.D.8486
Bonner DurchmusterungBD-11 351
Henry Draper Designation11131

Visual Facts

Star Type star
Absolute Magnitude4.91 / 4.95
Apparent Magnitude6.72
Right Ascension (R.A.)01h 49m 23.43
Declination (Dec.)-10d42`11.9
1997 Distance from Earth43.47 Parallax (milliarcseconds)
 75.03 Light Years
 23.00 Parsecs
2007 Revised Distance from Earth44.32 Parallax (milliarcseconds)
 73.59 Light Years
 22.56 Parsecs
Proper Motion Dec.-105.82 ± 2.03 milliarcseconds/year
Proper Motion RA.-124.54 ± 3.02 milliarcseconds/year
B-V Index0.65
Spectral TypeG0
Colour(G) White to Yellow

Companions (Multi-Star and Exoplanets) Facts

Companion StarsEpsilon Monocerotis

Estimated Facts

Radius (x the Sun)0.98
Calculated Effective Temperature5,761 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

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