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15 Geminorum

15 Geminorum Facts

15 Geminorum's Alternative Names

HIP30757 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD45352.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John named the stars in the constellation with a number and its latin name, this star's Flamsteed designation is 15 Geminorum. The Flamsteed name can be shortened to 15 Gem.

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+20 1427.

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

Location of 15 Geminorum

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 object is compared to the celestial equator and is expressed in degrees. For 15 Geminorum, the location is 06h 27m 46.58 and +20° 47` 22.6 .

Radial Velocity and Proper Motion of 15 Geminorum

Proper Motion

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 -44.09 ± 0.65 milliarcseconds/year towards the north and -32.59 ± 1.19 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -30.10 km/s with an error of about 3.00 km/s . 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.

Physical Properties (Colour, Temperature) of 15 Geminorum

15 Geminorum Colour and Temperature

15 Geminorum has a spectral type of K0. This means the star is a orange to red star. The star has a B-V Colour Index of 1.24 which means the star's temperature is about 4,494 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

15 Geminorum Radius

Radius has been calculated as being 13.35 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 9,292,202.18.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 13.05. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

15 Geminorum Apparent and Absolute Magnitudes

15 Geminorum has an apparent magnitude of 6.54 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 0.31 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.36. 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 15 Geminorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 5.67 which gave the calculated distance to 15 Geminorum as 575.24 light years away from Earth or 176.37 parsecs. If you want that in miles, it is 385,765,509,666.

In 2007, Hipparcos data was revised with a new parallax of 5.81 which put 15 Geminorum at a distance of 561.38 light years or 172.12 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 35,502,051.07 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.

Travel Time to 15 Geminorum

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Walking494,117,690,797.01
Car1203,137,256,359.90
Airbus A380736511,509,189.11
Speed of Sound (Mach 1)767.269490,663,330.84
Concorde (Mach 2)1,534.54245,331,345.67
New Horizons Probe33,00011,408,204.95
Speed of Light670,616,629.00561.38

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 15 Geminorum Facts and Figures

Visual Facts


Primary / Proper / Traditional Name15 Geminorum
Alternative NamesHD 45352, HIP 30757, 15 Gem, BD+20 1427
Spectral TypeK0
Constellation's Main StarNo
Multiple Star SystemYes
Star TypeStar
ColourOrange to Red
GalaxyMilky Way
ConstellationGemini
Absolute Magnitude 0.31 / 0.36
Visual / Apparent Magnitude6.54
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 27m 46.58
Declination (Dec.)+20° 47` 22.6
Galactic Latitude4.36 degrees
Galactic Longitude191.78 degrees
1997 Distance from Earth5.67 Parallax (milliarcseconds)
 575.24 Light Years
 176.37 Parsecs
2007 Distance from Earth5.81 Parallax (milliarcseconds)
 561.38 Light Years
 172.12 Parsecs
 35,502,051.07 Astronomical Units
Proper Motion Dec.-44.09 ± 0.65 milliarcseconds/year
Proper Motion RA.-32.59 ± 1.19 milliarcseconds/year
B-V Index1.24
Radial Velocity-30.10 ± 3.00 km/s

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Calculated Facts


Radius (x the Sun)13.05
Effective Temperature4,494 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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