ε Boötis (epsilon Boötis)

Below the horizon. Rise: 15:14 | Tran: 23:50 | Set: 8:30

Alt: -10.86° Az: 10.72° Direction: North

ε Boötis is a multiple main-sequence star of spectral class A2 in the constellation of Boötes.

ε Boötis visual magnitude is 5.12. Because of its faintness, ε Boötis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

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);

Celestial Coordinates

Apparent

Right Ascension 14h 46m 05s

Declination +26° 58’ 08”

Hour Angle 12h 47m 18s

Sidereal Time 03h 33m 24s

J2000

Right Ascension 14h 44m 59s

Declination +27° 04’ 29”

Galactic Coordinates

Galactic Longitude 39.38°

Galactic Latitude 64.78°

Finder Chart

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Finder chart for ε Boötis (epsilon Boötis).

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.12

Class Main-sequence

Absolute magnitude 1.08

Spectral Type A2V

Color Index (B-V)

Temperature 10125K

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

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

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:

Main star magnitude 5.12

Secondary star magnitude 7.72

Magnitude difference 2.6

Separation 2.8 arcsec

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 64.31

Distance (light year) 209.65

Radial Speed -23 km/s

Proper Motion RA -0.05 arcsec/y

Proper Motion Dec 0.021"/y

Alternative Designations

Bayer designation ε Boötis
(epsilon Boötis)

Flamsteed designation 36 Boötis

Henry Draper Catalogue HD129988

Hipparcos Catalogue HIP72105

Durchmusterung Catalogue BD+27 2417

Aitken Double Star Catalogue ADS9372

Visibility from Your Location

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

Azimuth: 63.0° RISE 15:14

Max altitude: 65.5° TRANSIT 23:50

Azimuth: 297.0° SET 8:30

Set Location

Other stars in Boötes