Universe Guide

Epsilon Boötis A

Epsilon Boötis A Facts

  • Epsilon Boötis A is a giant star that can be located in the constellation of Bootes. The description is based on the spectral class.
  • Epsilon Boötis A is not part of the constellation outline but is within the borders of the constellation.
  • Based on the spectral type (K0-II-III B) of the star, the star's colour is orange to red .
  • The star is calculated at being about 201.34 light years away from us. Distance

Epsilon Bootis A's Alternative Names

The Id of the star in the Yale Bright Star Catalogue is HR5506. The Id of the star in the Henry Draper catalogue is HD129989.

Epsilon Bootis A has alternative name(s) :- Eps Boo A.

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+27 2417A.

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

Location of Epsilon Boötis A

The location of the giant 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 Epsilon Boötis A, the location is 14h 44m 59.223 and +27° 04` 27.15 .

Radial Velocity and Proper Motion of Epsilon Boötis A

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 13.60 milliarcseconds/year towards the north and -42.20 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 -16.60000 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 of Epsilon Boötis A

Epsilon Bootis A Colour and Temperature

Based on the star's spectral type of K0-II-III B , Epsilon Bootis A's colour and type is orange to red giant star. Based on the star's spectral, the stars temperature is between 3,700.00 and 5,200.00 degrees kelvin.

Distance to Epsilon Boötis A

The Parallax of the star is given as 16.20000 which gives a calculated distance to Epsilon Boötis A of 201.34 light years from the Earth or 61.73 parsecs. It is about 1,183,602,432,636,788 miles from Earth.

The star is roughly 12,732,637.77 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.

Travel Time to Epsilon Bootis A

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.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A380736183,453,739.24
Speed of Sound (Mach 1)767.269175,977,332.70
Concorde (Mach 2)1,534.5487,988,551.67
New Horizons Probe33,0004,091,574.31
Speed of Light670,616,629.00201.34

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Additional Epsilon Boötis A Facts and Figures

Visual Facts

Primary / Proper / Traditional NameEpsilon Bootis A
Alternative NamesEps Boo A, HD 129989, HR 5506, BD+27 2417A
Spectral TypeK0-II-III B
Constellation's Main StarNo
Multiple Star SystemNo / Unknown
Star TypeGiant Star
ColourOrange to Red
GalaxyMilky Way
Right Ascension (R.A.)14h 44m 59.223
Declination (Dec.)+27° 04` 27.15
Distance from Earth16.20000 Parallax (milliarcseconds)
 201.34 Light Years
 61.73 Parsecs
 12,732,637.77 Astronomical Units
Proper Motion Dec.13.60000 milliarcseconds/year
Proper Motion RA.-42.20000 milliarcseconds/year
Radial Velocity-16.60000 km/s
Associated / Clustered StarsEpsilon Bootes B

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Calculated Temperature Range3,700.00 - 5,200.00

Related Stars

Comments and Questions

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