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ZZ Boötis, HD121648, HIP68064

Primary Facts on ZZ Boötis

  • ZZ Boötis's star type is eclipsing main sequence dwarf star that can be located in the constellation of Bootes. The description is based on the spectral class.
  • ZZ Boötis is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (F2V) of the star, the star's colour is blue to white .
  • The star can not be seen by the naked eye, you need a telescope to see it.
  • The star has an estimated age of 1.30 Billion of Years but could be as young as 1.20 to 1.40 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 340.11 light years away from us.

ZZ Bootis's Alternative Names

HIP68064 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD121648.

ZZ Bootis has alternative name(s) :- , ZZ 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+26 2508.

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

Location of ZZ Boötis

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 star is compared to the celestial equator and is expressed in degrees. For ZZ Boötis, the location is 13h 56m 09.58 and +25° 55` 07.4 .

Radial Velocity and Proper Motion of ZZ 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 -5.59 ± 0.31 miliarcseconds/year towards the north and -96.52 ± 0.51 miliarcseconds/year east if we saw them in the horizon.

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -29.50 km/s with an error of about 0.27 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.

ZZ Boötis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 17.60 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Physical Properties (Colour, Temperature, Age) of ZZ Boötis

ZZ Boötis has a spectral type of F2V. This means the star is a blue to white main sequence dwarf star. The star is 7,379.00 Parsecs from the Galactic Centre or in terms of Light Years is 24,067.59 s. The star has a B-V Colour Index of 0.4 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,728 Kelvin.

ZZ Boötis Radius has been calculated as being 3.41 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 2,374,657.29.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 3.16. 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 -0.10 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 1.30 Billion years old but could be between 1.20 and 1.40 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

ZZ Boötis Apparent and Absolute Magnitudes

ZZ Boötis has an apparent magnitude of 6.78 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 1.52 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.69. 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 ZZ Boötis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 8.88 which gave the calculated distance to ZZ Boötis as 367.30 light years away from Earth or 112.61 parsecs. It would take a spaceship travelling at the speed of light, 367.30 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 9.59 which put ZZ Boötis at a distance of 340.11 light years or 104.28 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 21,509,144.12 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.

The star's Galacto-Centric Distance is 7,379.00 Parsecs or 24,067.59 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Variable Type of ZZ Boötis

The star is a eclipsing Beta Persei (Algol)/ 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. ZZ Boötis brightness ranges from a magnitude of 6.895 to a magnitude of 6.860 over its variable period. The smaller the magnitude, the brighter the star.

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 ZZ Boötis Facts and Figures

Visual Facts


Primary / Proper / Traditional NameZZ Bootis
Alternative NamesHD 121648, HIP 68064, BD+26 2508, ZZ Boo
Spectral TypeF2V
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star Type main sequence Dwarf Star
Colour blue to white
GalaxyMilky Way
ConstellationBootes
Age1.30 Billion Years Old
Age Range1.20 - 1.40 Billion Years Old
Absolute Magnitude 1.52 / 1.69
Visual / Apparent Magnitude6.78
Naked Eye VisibleRequires a 7x50 Binoculars - Magnitudes
Right Ascension (R.A.)13h 56m 09.58
Declination (Dec.)+25° 55` 07.4
Galactic Latitude75.48 degrees
Galactic Longitude31.82 degrees
1997 Distance from Earth8.88 Parallax (milliarcseconds)
 367.30 Light Years
 112.61 Parsecs
2007 Distance from Earth9.59 Parallax (milliarcseconds)
 340.11 Light Years
 104.28 Parsecs
 21,509,144.12 Astronomical Units
Galacto-Centric Distance24,067.59 Light Years / 7,379.00 Parsecs
Proper Motion Dec.-5.59 ± 0.31 milliarcseconds/year
Proper Motion RA.-96.52 ± 0.51 milliarcseconds/year
B-V Index0.40
Radial Velocity-29.50 ± 0.27 km/s
Iron Abundance-0.10 ± 9.99 Fe/H
Eccentricity0.22
Semi-Major Axis6104.00
Stellar Luminosity (Lsun)17.60

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Variable Star Details


Variable Star ClassEclipsing
Variable Star TypeBeta Persei (Algol)/
Variable Magnitude Range (Brighter - Dimmer)6.860 - 6.895

Estimated Facts


Calculated Effective Temperature6,728 Kelvin

Sources and Links


SIMBAD SourceLink

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