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EZ Boötis

EZ Boötis Facts

EZ Bootis's Alternative Names

HIP74214 is the reference name for the star in the Hipparcos Star Catalogue.

EZ Bootis has alternative name(s) :- , EZ Boo.

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 3072.

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

Location of EZ Boötis

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 EZ Boötis, the location is 15h 09m 56.98 and +20° 25` 25.8 .

Proper Motion of EZ Boötis

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 11.35 ± 0.77 miliarcseconds/year towards the north and -28.64 ± 1.48 miliarcseconds/year east if we saw them in the horizon. . 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 EZ Boötis

EZ Boötis has a spectral type of M2. This means the star is a red variable star. The star has a B-V Colour Index of 1.53 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 3,949 Kelvin.

EZ Boötis Radius has been calculated as being 51.04 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 35,516,780.44.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 15.20. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures.

EZ Boötis Apparent and Absolute Magnitudes

EZ Boötis has an apparent magnitude of 9.84 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 -2.04 If you used the 2007 Parallax value, you would get an absolute magnitude of 0.59. 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 EZ Boötis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 0.42 which gave the calculated distance to EZ Boötis as 7765.79 light years away from Earth or 2380.95 parsecs. It would take a spaceship travelling at the speed of light, 7765.79 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 1.41 which put EZ Boötis at a distance of 2313.22 light years or 709.22 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 146,286,106.55 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. EZ Boötis brightness ranges from a magnitude of 9.978 to a magnitude of 9.835 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 EZ Boötis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameEZ Bootis
Alternative NamesHIP 74214, BD+20 3072, EZ Boo
Spectral TypeM2
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeVariable Star
ColourRed
GalaxyMilky Way
ConstellationBootes
Absolute Magnitude -2.04 / 0.59
Visual / Apparent Magnitude9.84
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)15h 09m 56.98
Declination (Dec.)+20° 25` 25.8
Galactic Latitude57.72 degrees
Galactic Longitude28.52 degrees
1997 Distance from Earth0.42 Parallax (milliarcseconds)
 7765.79 Light Years
 2380.95 Parsecs
2007 Distance from Earth1.41 Parallax (milliarcseconds)
 2313.22 Light Years
 709.22 Parsecs
 146,286,106.55 Astronomical Units
Proper Motion Dec.11.35 ± 0.77 milliarcseconds/year
Proper Motion RA.-28.64 ± 1.48 milliarcseconds/year
B-V Index1.53

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Mean Variability Period in Days0.081
Variable Magnitude Range (Brighter - Dimmer)9.835 - 9.978

Estimated Calculated Facts


Radius (x the Sun)15.20
Effective Temperature3,949 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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