We use cookies to deliver essential features and to measure their performance. Learn more.
We're free & ads-free thanks to your support
public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:07 
Transit: 13:06 
Sunset: 21:04
sunny   (Daytime)   What's Visible Now?
All Constellations » Leo » 

Regulus - α Leonis (alpha Leonis)

Above the horizon.  Rise: 8:19 | Tran: 15:18 | Set: 22:17
Alt: 41.40°   Az: 131.92°   Direction: South-East

Regulus, also designated as α Leonis (alpha Leonis), is a variable and multiple main-sequence star of spectral class B7 in the constellation of Leo.

Regulus visual magnitude is 1.35, making it the 21th brightest star in the sky. Because of its brightness, Regulus is clearly visible to the naked eye when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

Image of Regulus - α Leonis (alpha Leonis) star
DSS2 image of Regulus. The red arrow shows the motion of Regulus during the next 1000 years (-4.13 arcmin in Right Ascension and 0.10 arcmin in declination);

Celestial Coordinates

Apparent

10h 09m 41s
+11° 50’ 46”
21h 40m 55s
07h 50m 36s

J2000

10h 08m 22s
+11° 58’ 01”

Galactic Coordinates

226.43°
48.94°

Finder Chart

Finder chart Regulus - α Leonis (alpha Leonis) star
Simplified finder chart for Regulus - α Leonis (alpha Leonis).

Magnitude, Color, Spectral Class

1.35
Main-sequence

-0.53
B7V
11744K

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

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

Star System Properties

Regulus 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 Regulus double sysyem:

1.35
8.15
6.8
177.6 arcsec

Distance, Radial Speed, Proper Motion

Regulus is distant 77.45 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

23.76
77.45
6 km/s
-0.248 arcsec/y
0.006"/y

Alternative Designations

Regulus
α Leonis
(alpha Leonis)
SAO98967
SAO98967

Visibility from Your Location

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

Azimuth: 78.2°
Max altitude: 50.4°
Azimuth: 281.8°