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BU Geminorum (6 Geminorum)

BU Geminorum Facts

BU Geminorum's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR2197. HIP29450 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD42543.

BU Geminorum has alternative name(s) :- BU Gem, BU Gem.

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 6 Geminorum. The Flamsteed name can be shortened to 6 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+22 1220.

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

Location of BU Geminorum

The location of the supergiant 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 BU Geminorum, the location is 06h 12m 19.10 and +22° 54` 30.7 .

Physical Properties (Colour, Temperature) of BU Geminorum

BU Geminorum Colour and Temperature

BU Geminorum has a spectral type of M1Ia-ab. This means the star is a red supergiant star. The star has a B-V Colour Index of 2.19 which means the star's temperature is about 682 Kelvin. The temperature was calculated using information from Morgans @ Uni.edu at being .

BU Geminorum Radius

Radius has been calculated as being 4,399.21 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,060,971,137.83.km. If you need the diameter of the star, you just need to multiple the radius by 2. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is 0.14 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

BU Geminorum Apparent and Absolute Magnitudes

BU Geminorum has an apparent magnitude of 6.51 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 -4.09 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 BU Geminorum

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.76 which gave the calculated distance to BU Geminorum as 4291.62 light years away from Earth or 1315.79 parsecs. If you want that in miles, it is 2,878,031,737,349.

Travel Time to BU 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)
Walking4719,507,934,337.25
Car12023,983,597,811.24
Airbus A3807363,910,369,208.35
Speed of Sound (Mach 1)767.2693,751,007,452.86
Concorde (Mach 2)1,534.541,875,501,282.04
New Horizons Probe33,00087,213,082.95
Speed of Light670,616,629.004,291.62

Variable Type of BU Geminorum

The star is a pulsating Slow Irregular 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. BU Geminorum brightness ranges from a magnitude of 6.443 to a magnitude of 6.183 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.2 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 BU Geminorum Facts and Figures

Visual Facts


Primary / Proper / Traditional NameBU Geminorum
Alternative NamesBu Gem, BU Gem, HD 42543, HIP 29450, HR 2197, 6 Geminorum, 6 Gem, BD+22 1220, BU Gem
Spectral TypeM1Ia-ab
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type very luminous Supergiant Star
ColourRed
GalaxyMilky Way
ConstellationGemini
Absolute Magnitude -4.09
Visual / Apparent Magnitude6.51
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)06h 12m 19.10
Declination (Dec.)+22° 54` 30.7
Galactic Latitude2.19 degrees
Galactic Longitude188.22 degrees
Distance from Earth0.76 Parallax (milliarcseconds)
 4291.62 Light Years
 1315.79 Parsecs
 271,399,278.28 Astronomical Units
B-V Index2.19
Radial Velocity27.16 ± 0.42 km/s
Iron Abundance0.14 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassPulsating
Variable Star TypeSlow Irregular
Mean Variability Period in Days0.226
Variable Magnitude Range (Brighter - Dimmer)6.183 - 6.443

Estimated Calculated Facts


Radius (x the Sun)4,399.21
Effective Temperature682 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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