Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 6:45  ☀️ Transit: 13:03  🌅 Sunset: 19:23

31 Leonis

31 Leonis is a double giant star in the constellation of Leo.

31 Leonis visual magnitude is 4.37. Because of its moderate brightness, 31 Leonis 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 table below summarizes the key facts about 31 Leonis:

31 Leonis is above the horizon from Greenwich, United Kingdom [change]. Altitude: 35°.

Celestial coordinates and finder chart of 31 Leonis

31 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 31 Leonis are provided in the following table:

10h 07m 54s
+09° 59’ 51”

The simplified sky map below shows the position of 31 Leonis in the sky:

Finder chart 31 Leonis star
Simplified finder chart for 31 Leonis.

Visibility of 31 Leonis from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's 31 Leonis rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 80.0°
Max altitude: 48.5°
Azimuth: 280.0°
31 Leonis is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 31 Leonis

The image below is a photograph of 31 Leonis from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 31 Leonis is -0.08 arcsec per year in Right Ascension and -0.061 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 31 Leonis star
DSS2 image of 31 Leonis. The red arrow shows the motion of 31 Leonis during the next 10000 years (-13.33 arcmin in Right Ascension and -10.17 arcmin in declination);

Distance of 31 Leonis from the Sun and relative movement

31 Leonis is distant 274.18 light years from the Sun and it is moving far from the Sun at the speed of 41 kilometers per second.

84.10 pc
274.18 ly
41 km/s
-0.08 arcsec/year
-0.061 arcsec/year

Spectral properties of 31 Leonis

31 Leonis belongs to spectral class K3 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 31 Leonis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 31 Leonis. Attribution: Richard Powell / CC BY-SA

31 Leonis star system properties

31 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 31 Leonis double sysyem:

7.9 arcsec

Alternative designations of 31 Leonis