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3 Boötis, HD120064, HIP67239, HR5182

3 Boötis is a blue to white subgiant star that can be located in the constellation of Bootes. The description is based on the spectral class. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it. The star has an estimated age of 1.20 Billion of Years but could be as young as 1.10 to 1.30 according to Hipparcos.

3 Bootis's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR5182. HIP67239 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD120064.

Flamsteed designations are named after the creator, Sir John Flamsteed. Sir John numbered the stars in the constellation with a number and the latin name, this star's Flamsteed designation is 3 Bootis with it shortened to 3 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 2494.

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

Location of 3 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 3 Boötis, the location is 13h 46m 43.33 and +25° 42` 08.6 .

Proper Motion of 3 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 -58.73 ± 0.22 miliarcseconds/year towards the north and -18.47 ± 0.40 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 us is 11.90000 km/s with an error of about 0.90 km/s .

3 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 28.61 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 3 Boötis

3 Boötis has a spectral type of F6IV-V. This means the star is a blue to white subgiant star. The star is 7,384.00 Parsecs from the Galactic Centre or terms of Light Years is 24,083.90 s. The star has a B-V Colour Index of 0.52 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 6,202 Kelvin.

3 Boötis Radius has been calculated as being 4.32 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 3,008,229.42.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 4.63. 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 0.15 with an error value of 0.05 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 1.20 Billion years old but could be between 1.10 and 1.30 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

3 Boötis Apparent and Absolute Magnitudes

3 Boötis has an apparent magnitude of 5.97 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 1.36 If you used the 2007 Parallax value, you would get an absolute magnitude of 1.21. 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 3 Boötis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 11.97 which gave the calculated distance to 3 Boötis as 272.48 light years away from Earth or 83.54 parsecs. It would take a spaceship travelling at the speed of light, 272.48 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 11.15 which put 3 Boötis at a distance of 292.52 light years or 89.69 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.

The star's Galacto-Centric Distance is 7,384.00 Parsecs or 24,083.90 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

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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3 Boötis Facts

Visual Facts


Primary / Proper / Traditional Name3 Bootis
Alternative NamesHD 120064, HIP 67239, HR 5182, 3 Boo, BD+26 2494
Spectral TypeF6IV-V
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
Colour blue to white
GalaxyMilky Way
ConstellationBootes
Age1.20 Billion Years Old
Age Range1.10 - 1.30 Billion Years Old
Absolute Magnitude1.36 / 1.21
Visual / Apparent Magnitude5.97
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)13h 46m 43.33
Declination (Dec.)+25° 42` 08.6
Galactic Latitude77.55 degrees
Galactic Longitude29.48 degrees
1997 Distance from Earth11.97 Parallax (milliarcseconds)
 272.48 Light Years
 83.54 Parsecs
2007 Distance from Earth11.15 Parallax (milliarcseconds)
 292.52 Light Years
 89.69 Parsecs
Galacto-Centric Distance24,083.90 Light Years / 7,384.00 Parsecs
Proper Motion Dec.-58.73 ± 0.22 milliarcseconds/year
Proper Motion RA.-18.47 ± 0.40 milliarcseconds/year
B-V Index0.52
Radial Velocity11.90 ± 0.90 km/s
Iron Abundance0.15 ± 0.05 Fe/H
Eccentricity0.14
Semi-Major Axis6922.00
Stellar Luminosity (Lsun)28.61

Companions (Multi-Star and Exoplanets) Facts


Exoplanet CountNone/Unaware

Estimated Facts


Calculated Effective Temperature6,202 Kelvin

Sources and Links


SIMBAD SourceLink

Related Stars


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