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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: 6:48  
clear_day Transit: 12:11  
SunsetSet: 17:34
sunny DaytimeWhat's Visible Now?
All Constellations » Leo » 

31 Leonis

Altitude: -3.7°   Azimuth: 291.1°   Direction: West-North-West

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 skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

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);

Key facts about 31 Leonis

4.37
Giant

31 Leonis is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -3.7°
Azimuth: 291.1°
Direction: West-North-West

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”
228.95°
47.89°
Leo

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 edit_location_alt
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 edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 80.0°
Max altitude: 48.5°
Azimuth: 280.0°

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.

-0.25
K3III
3870K

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:

4.37
12.07
7.7
7.9 arcsec

Alternative designations of 31 Leonis

SAO98964
SAO98964