81 Leonis

Above the horizon. Rise: 10:58 | Tran: 18:22 | Set: 1:50

Alt: 19.62° Az: 271.79° Direction: South-West

81 Leonis is a double main-sequence star of spectral class F2 in the constellation of Leo.

81 Leonis visual magnitude is 5.57. Because of its faintness, 81 Leonis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 81 Leonis. The red arrow shows the motion of 81 Leonis during the next 1000 years (-2.38 arcmin in Right Ascension and -0.08 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 11h 26m 56s

Declination +16° 18’ 57”

Hour Angle 05h 15m 16s

Sidereal Time 16h 42m 12s

J2000

Right Ascension 11h 25m 36s

Declination +16° 27’ 23”

Galactic Coordinates

Galactic Longitude 236.75°

Galactic Latitude 67.45°

Finder Chart

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Finder chart for 81 Leonis.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.57

Class Main-sequence

Absolute magnitude 2.20

Spectral Type F2V

Color Index (B-V) 0.36

Temperature 7101K

The red dot in the diagram below shows where 81 Leonis is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 81 Leonis. Attribution: Richard Powell / CC BY-SA

Star System Properties

81 Leonis is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 81 Leonis double sysyem:

Main star magnitude 5.57

Secondary star magnitude 9.17

Magnitude difference 3.6

Separation 55.7 arcsec

Distance, Radial Speed, Proper Motion

81 Leonis is distant 154.14 light years from the Sun and it is moving far from the Sun at the speed of 18 kilometers per second.

Distance (parsec) 47.28

Distance (light year) 154.14

Radial Speed 18 km/s

Proper Motion RA -0.143 arcsec/y

Proper Motion Dec -0.005"/y

Alternative Designations

Flamsteed designation 81 Leonis

Henry Draper Catalogue HD99285

SAO Catalogue SAO99601

Hipparcos Catalogue HIP55765

Durchmusterung Catalogue BD+17 2356

FK5 Catalogue 2913

Visibility from Your Location

Today's 81 Leonis rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 73.7° RISE 10:58

Max altitude: 54.8° TRANSIT 18:22

Azimuth: 286.3° SET 1:50

Set Location

Other stars in Leo