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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: 6:59  
clear_day Transit: 12:12  
SunsetSet: 17:25
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All Constellations » Leo » 

20 Leonis

Altitude: 42.6°   Azimuth: 248.4°   Direction: West-South-West

20 Leonis is a variable and double sub-giant star in the constellation of Leo.

20 Leonis visual magnitude is 6.09. Because of its reltive faintness, 20 Leonis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of 20 Leonis is -0.043 arcsec per year in Right Ascension and -0.012 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 20 Leonis star
DSS2 image of 20 Leonis. The red arrow shows the motion of 20 Leonis during the next 10000 years (-7.17 arcmin in Right Ascension and -2.00 arcmin in declination);

Key facts about 20 Leonis


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

Altitude: 42.6°
Azimuth: 248.4°
Direction: West-South-West

Celestial coordinates and finder chart of 20 Leonis

20 Leonis 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 Leonis are provided in the following table:

09h 49m 50s
+21° 10’ 45”

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

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

Visibility of 20 Leonis 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 Leonis 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: 68.8°
Max altitude: 59.7°
Azimuth: 291.2°

Distance of 20 Leonis from the Sun and relative movement

20 Leonis is distant 514.20 light years from the Sun and it is moving far from the Sun at the speed of 26 kilometers per second.

157.73 pc
514.20 ly
26 km/s
-0.043 arcsec/year
-0.012 arcsec/year

Spectral properties of 20 Leonis

20 Leonis belongs to spectral class A7 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

20 Leonis star system properties

20 Leonis is a visual double star which can be observed only with the help of very large telescopes. The table below shows key information about the 20 Leonis double sysyem:

0.3 arcsec

Alternative designations of 20 Leonis