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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 » 

20 Boötis

Altitude: 3.4°   Azimuth: 67.9°   Direction: East-North-East

20 Boötis is a variable giant star in the constellation of Boötes.

20 Boötis visual magnitude is 4.86. Because of its moderate brightness, 20 Boötis should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of 20 Boötis is -0.142 arcsec per year in Right Ascension and 0.06 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 20 Boötis star
DSS2 image of 20 Boötis. The red arrow shows the motion of 20 Boötis during the next 1000 years (-2.37 arcmin in Right Ascension and 1.00 arcmin in declination);

Key facts about 20 Boötis

4.86
Giant

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

Altitude: 3.4°
Azimuth: 67.9°
Direction: East-North-East

Celestial coordinates and finder chart of 20 Boötis

20 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 20 Boötis are provided in the following table:

14h 19m 45s
+16° 18’ 24”
9.59°
66.86°
Boötes

The simplified sky map below shows the position of 20 Boötis in the sky:

Finder chart 20 Boötis star
Simplified finder chart for 20 Boötis.

Visibility of 20 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 20 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: 73.7°
Max altitude: 54.8°
Azimuth: 286.3°

Distance of 20 Boötis from the Sun and relative movement

20 Boötis is distant 190.42 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

58.41 pc
190.42 ly
-8 km/s
-0.142 arcsec/year
0.06 arcsec/year

Spectral properties of 20 Boötis

20 Boötis belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.

1.03
K3III
4251K

The red dot in the diagram below shows where 20 Boötis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 20 Boötis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 20 Boötis

SAO100980
SAO100980