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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: 7:03  
clear_day Transit: 12:12  
SunsetSet: 17:22
sleep NighttimeWhat's Visible Now?
All Constellations » Boötes » 

σ Boötis (sigma Boötis)

Altitude: 18.6°   Azimuth: 65.3°   Direction: East-North-East

σ Boötis is a variable and multiple main-sequence star in the constellation of Boötes.

σ Boötis visual magnitude is 4.46. Because of its moderate brightness, σ Boötis should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The proper motion of σ Boötis is 0.189 arcsec per year in Right Ascension and 0.132 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of σ Boötis (sigma Boötis) star
DSS2 image of σ Boötis. The red arrow shows the motion of σ Boötis during the next 1000 years (3.15 arcmin in Right Ascension and 2.20 arcmin in declination);

Key facts about σ Boötis


σ Boötis (sigma Boötis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 18.6°
Azimuth: 65.3°
Direction: East-North-East

Celestial coordinates and finder chart of σ Boötis

σ 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 σ Boötis are provided in the following table:

14h 34m 40s
+29° 44’ 42”

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

Finder chart σ Boötis (sigma Boötis) star
Simplified finder chart for σ Boötis (sigma Boötis).

Visibility of σ 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 σ Boötis (sigma 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: 60.3°
Max altitude: 68.3°
Azimuth: 299.7°

Distance of σ Boötis from the Sun and relative movement

σ Boötis is distant 50.42 light years from the Sun

15.47 pc
50.42 ly
0.189 arcsec/year
0.132 arcsec/year

Spectral properties of σ Boötis

σ Boötis belongs to spectral class F2 and has a luminosity class of V corresponding to a main-sequence star.


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

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

σ Boötis star system properties

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

237.1 arcsec

Alternative designations of σ Boötis

σ Boötis
(sigma Boötis)