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 .
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 .
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 .
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 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.
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.
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.
|Description||Speed (m.p.h.)||Time (years)|
|Speed of Sound (Mach 1)||767.269||3,751,007,452.86|
|Concorde (Mach 2)||1,534.54||1,875,501,282.04|
|New Horizons Probe||33,000||87,213,082.95|
|Speed of Light||670,616,629.00||4,291.62|
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).
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.
|Primary / Proper / Traditional Name||BU Geminorum|
|Alternative Names||Bu Gem, BU Gem, HD 42543, HIP 29450, HR 2197, 6 Geminorum, 6 Gem, BD+22 1220, BU Gem|
|Constellation's Main Star||No|
|Multiple Star System||No / Unknown|
|Star Type||very luminous Supergiant Star|
|Visual / Apparent Magnitude||6.51|
|Naked Eye Visible||Requires a 7x50 Binoculars - Magnitudes|
|Right Ascension (R.A.)||06h 12m 19.10|
|Declination (Dec.)||+22° 54` 30.7|
|Galactic Latitude||2.19 degrees|
|Galactic Longitude||188.22 degrees|
|Distance from Earth||0.76 Parallax (milliarcseconds)|
|4291.62 Light Years|
|271,399,278.28 Astronomical Units|
|Radial Velocity||27.16 ± 0.42 km/s|
|Iron Abundance||0.14 ± 9.99 Fe/H|
|Variable Star Class||Pulsating|
|Variable Star Type||Slow Irregular|
|Mean Variability Period in Days||0.226|
|Variable Magnitude Range (Brighter - Dimmer)||6.183 - 6.443|
|Radius (x the Sun)||4,399.21|
|Effective Temperature||682 Kelvin|
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