31 Leonis

Below the horizon. Rise: 2:51 | Tran: 9:39 | Set: 16:27

Alt: -17.57° Az: 313.37° Direction: North-West

31 Leonis is a double giant star of spectral class K3 in the constellation of Leo.

31 Leonis visual magnitude is 4.37. Because of its moderate brightness, 31 Leonis is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

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);

Celestial Coordinates

Apparent

Right Ascension 10h 09m 13s

Declination +09° 52’ 31”

Hour Angle 09h 01m 10s

Sidereal Time 19h 10m 23s

J2000

Right Ascension 10h 07m 54s

Declination +09° 59’ 51”

Galactic Coordinates

Galactic Longitude 228.95°

Galactic Latitude 47.89°

Finder Chart

Simplified finder chart for 31 Leonis.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 4.37

Class Giant

Absolute magnitude -0.25

Spectral Type K3III

Color Index (B-V) 1.45

Temperature 3870K

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

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

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:

Main star magnitude 4.37

Secondary star magnitude 12.07

Magnitude difference 7.7

Separation 7.9 arcsec

Distance, Radial Speed, Proper Motion

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.

Distance (parsec) 84.10

Distance (light year) 274.18

Radial Speed 41 km/s

Proper Motion RA -0.08 arcsec/y

Proper Motion Dec -0.061"/y

Alternative Designations

Flamsteed designation 31 Leonis

Henry Draper Catalogue HD87837

SAO Catalogue SAO98964

Hipparcos Catalogue HIP49637

Durchmusterung Catalogue BD+10 2112

Aitken Double Star Catalogue ADS7649

Visibility from Your Location

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

Azimuth: 80.1° RISE 2:51

Max altitude: 48.4° TRANSIT 9:39

Azimuth: 279.9° SET 16:27

Set Location

Other stars in Leo