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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 5:51  
clear_day Transit: 12:57  
SunsetSet: 20:04
sunny DaytimeWhat's Visible Now?
All Constellations » Boötes » 

ε Boötis (epsilon Boötis)

Altitude: 20.9°   Azimuth: 72.3°   Direction: East-North-East

ε Boötis is a multiple main-sequence star in the constellation of Boötes.

ε Boötis visual magnitude is 5.12. Because of its reltive faintness, ε Boötis should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of ε Boötis is -0.05 arcsec per year in Right Ascension and 0.021 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ε Boötis (epsilon Boötis) star
DSS2 image of ε Boötis. The red arrow shows the motion of ε Boötis during the next 10000 years (-8.33 arcmin in Right Ascension and 3.50 arcmin in declination);

Key facts about ε Boötis

5.12
Main-sequence

ε Boötis (epsilon Boötis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 20.9°
Azimuth: 72.3°
Direction: East-North-East

Celestial coordinates and finder chart of ε Boötis

ε Boötis is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of ε Boötis are provided in the following table:

14h 44m 59s
+27° 04’ 29”
39.38°
64.78°
Boötes

The simplified sky map below shows the position of ε Boötis in the sky:

Finder chart ε Boötis (epsilon Boötis) star
Simplified finder chart for ε Boötis (epsilon Boötis).

Visibility of ε Boötis from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's ε Boötis (epsilon Boötis) rise, transit and set times from Greenwich, United Kingdom edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 62.9°
Max altitude: 65.6°
Azimuth: 297.1°

Distance of ε Boötis from the Sun and relative movement

ε Boötis is distant 209.65 light years from the Sun and it is moving towards the Sun at the speed of 23 kilometers per second.

64.31 pc
209.65 ly
-23 km/s
-0.05 arcsec/year
0.021 arcsec/year

Spectral properties of ε Boötis

ε Boötis belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.

1.08
A2V
10125K

The red dot in the diagram below shows where ε Boötis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ε Boötis. Attribution: Richard Powell / CC BY-SA

ε Boötis star system properties

ε Boötis is a visual double star which can be observed with the help of medium or large telescopes. The table below shows key information about the ε Boötis double sysyem:

5.12
7.72
2.6
2.8 arcsec

Alternative designations of ε Boötis

ε Boötis
(epsilon Boötis)