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GG Ursae Majoris

GG Ursae Majoris Facts

GG Ursae Majoris's Alternative Names

HIP45693 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD79781.

GG Ursae Majoris has alternative name(s) :- GG UMa, GG UMa.

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+63 835.

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

Location of GG Ursae Majoris

The location of the variable 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 GG Ursae Majoris, the location is 09h 18m 53.69 and +62° 50` 34.3 .

Radial Velocity and Proper Motion of GG Ursae Majoris

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 -8.45 ± 0.54 milliarcseconds/year towards the north and -0.14 ± 0.95 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 -14.80 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, Age) of GG Ursae Majoris

GG Ursae Majoris Colour and Temperature

GG Ursae Majoris has a spectral type of F5. This means the star is a yellow to white variable star. The star has a B-V Colour Index of 0.39 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,431 Kelvin.

GG Ursae Majoris Radius

Radius has been calculated as being 4.60 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,197,571.81.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 4.70. 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 0.49 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context.

The stars age according to Hipparcos data files put the star at an age of about 0.80 Billion years old but could be between 0.70 and 0.90 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

GG Ursae Majoris Apparent and Absolute Magnitudes

GG Ursae Majoris has an apparent magnitude of 8.60 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 1.07 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.02. 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 GG Ursae Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 3.12 which gave the calculated distance to GG Ursae Majoris as 1045.40 light years away from Earth or 320.51 parsecs. If you want that in miles, it is 6,286,543,187,828,810.00.

In 2007, Hipparcos data was revised with a new parallax of 3.05 which put GG Ursae Majoris at a distance of 1069.39 light years or 327.87 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 67,627,570.79 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.

Time to Travel to GG Ursae Majoris

A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

If you were to drive there at about 120 m.p.h. in a car with an infinity engine so you didn't have to pull over for petrol, it would take you 51,212,624,709,384.46 hours or 5,846,190,035.32 years.

At the time of writing, the fastest probe so far created is the New Horizon probe which is travelling at a speed of 33,000 m.p.h. If the probe was travelling to GG Ursae Majoris then it would take 186,227,726,215.94 hours / 21,258,872.86 years to get there. Speed Ref: N.A.S.A.

It would to take a spaceship journey travelling at the speed of light, 1045.40 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

GG Ursae Majoris brightness ranges from a magnitude of 8.720 to a magnitude of 8.662 over its variable period. The smaller the magnitude, the brighter the star. Its variable/pulsating period lasts for 0.1 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 GG Ursae Majoris Facts and Figures

Visual Facts


Primary / Proper / Traditional NameGG Ursae Majoris
Alternative NamesGG UMa, HD 79781, HIP 45693, BD+63 835, GG UMa
Spectral TypeF5
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourYellow - White
GalaxyMilky Way
ConstellationUrsa Major
Age0.80 Billion Years Old
Age Range0.70 - 0.90 Billion Years Old
Absolute Magnitude 1.07 / 1.02
Visual / Apparent Magnitude8.60
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)09h 18m 53.69
Declination (Dec.)+62° 50` 34.3
Galactic Latitude40.50 degrees
Galactic Longitude151.63 degrees
1997 Distance from Earth3.12 Parallax (milliarcseconds)
 1045.40 Light Years
 320.51 Parsecs
2007 Distance from Earth3.05 Parallax (milliarcseconds)
 1069.39 Light Years
 327.87 Parsecs
 67,627,570.79 Astronomical Units
Proper Motion Dec.-8.45 ± 0.54 milliarcseconds/year
Proper Motion RA.-0.14 ± 0.95 milliarcseconds/year
B-V Index0.39
Radial Velocity-14.80 ± 3.00 km/s
Iron Abundance0.49 ± 9.99 Fe/H

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.135
Variable Magnitude Range (Brighter - Dimmer)8.662 - 8.720

Estimated Calculated Facts


Radius (x the Sun)4.70
Effective Temperature6,431 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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