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W Geminorum, HD46595, HIP31404

W Geminorum is a blue to white pulsating star that can be located in the constellation of Gemini. The star can not be seen by the naked eye, you need a telescope to see it.

HIP31404 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD46595.

W Geminorum has alternative name(s), W Gem.

Location of W Geminorum

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 W Geminorum, the location is 06h 34m 57.45 and +15d 19` 49.7 .

Physical Properties (Colour, Temperature, Radius) of W Geminorum

W Geminorum has a spectral type of F7.5. This means the star is a blue to white star. The star has a B-V Colour Index of 0.94 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 5,105 Kelvin.

W Geminorum Radius has been calculated as being 53.82 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 37,447,983.84.km. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

W Geminorum Apparent and Absolute Magnitudes

W Geminorum has an apparent magnitude of 7.06 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 -3.27 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 W Geminorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.86 which gave the calculated distance to W Geminorum as 3792.60 light years away from Earth or 1162.79 parsecs. It would take a spaceship travelling at the speed of light, 3792.60 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

Variable Type of W Geminorum

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. W Geminorum brightness ranges from a magnitude of 7.585 to a magnitude of 6.725 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 7.9 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.

W Geminorum Facts

Alternative Names

Traditional/Proper NameW Geminorum
Short NameW Gem
Hipparcos Library I.D.31404
Bonner DurchmusterungBD+15 1246
Henry Draper Designation46595

Visual Facts

Star Type star
Visual / Apparent Magnitude7.06
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 34m 57.45
Declination (Dec.)+15d 19` 49.7
Galactic Latitude3.38 degrees
Galactic Longitude197.42 degrees
Distance from Earth0.86 Parallax (milliarcseconds)
 3792.60 Light Years
 1162.79 Parsecs
B-V Index0.94
Radial Velocity0.30 ± 0.30 km/s
Spectral TypeF7.5
Colour(F) blue to white

Variable Star Details

Variable Star ClassPulsating
Variable Star TypeDelta Cepheid
Mean Variability Period in Days7.915
Variable Magnitude Range (Brighter - Dimmer)6.725 - 7.585

Estimated Facts

Calculated Effective Temperature5,105 Kelvin

Sources and Links

SIMBAD SourceLink

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