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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
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All Constellations » Boötes » 

18 Boötis

Altitude: 0.4°   Azimuth: 69.4°   Direction: East-North-East

18 Boötis is a double sub-giant star in the constellation of Boötes.

18 Boötis visual magnitude is 5.41. Because of its reltive faintness, 18 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 18 Boötis is 0.106 arcsec per year in Right Ascension and -0.03 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 18 Boötis star
DSS2 image of 18 Boötis. The red arrow shows the motion of 18 Boötis during the next 1000 years (1.77 arcmin in Right Ascension and -0.50 arcmin in declination);

Key facts about 18 Boötis


18 Boötis is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 0.4°
Azimuth: 69.4°
Direction: East-North-East

Celestial coordinates and finder chart of 18 Boötis

18 Boötis is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 18 Boötis are provided in the following table:

14h 19m 16s
+13° 00’ 15”

The simplified sky map below shows the position of 18 Boötis in the sky:

Finder chart 18 Boötis star
Simplified finder chart for 18 Boötis.

Visibility of 18 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 18 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: 77.0°
Max altitude: 51.5°
Azimuth: 283.0°

Distance of 18 Boötis from the Sun and relative movement

18 Boötis is distant 85.05 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

26.09 pc
85.05 ly
-3 km/s
0.106 arcsec/year
-0.03 arcsec/year

Spectral properties of 18 Boötis

18 Boötis belongs to spectral class F5 and has a luminosity class of IV corresponding to a sub-giant star.


The red dot in the diagram below shows where 18 Boötis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 18 Boötis. Attribution: Richard Powell / CC BY-SA

18 Boötis star system properties

18 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 18 Boötis double sysyem:

156.4 arcsec

Alternative designations of 18 Boötis