Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
sunny DaytimeWhat's Visible Now
All Constellations » Leo » 

Regulus - α Leonis (alpha Leonis)

Altitude: 31.5°   Azimuth: 112.4°   Direction: East-South-East

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

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

The table below summarizes the key facts about Regulus:


Regulus - α Leonis (alpha Leonis) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 31.5°
Azimuth: 112.4°
Direction: East-South-East

Celestial coordinates and finder chart of Regulus

Regulus 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 Regulus are provided in the following table:

10h 08m 22s
+11° 58’ 01”

The simplified sky map below shows the position of Regulus in the sky:

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

Visibility of Regulus 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 Regulus - α Leonis (alpha 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: 78.0°
Max altitude: 50.5°
Azimuth: 282.0°
Regulus - α Leonis (alpha Leonis) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Regulus

The image below is a photograph of Regulus 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 Regulus is -0.248 arcsec per year in Right Ascension and 0.006 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

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);

Distance of Regulus from the Sun and relative movement

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 pc
77.45 ly
6 km/s
-0.248 arcsec/year
0.006 arcsec/year

Spectral properties of Regulus

Regulus belongs to spectral class B7 and has a luminosity class of V corresponding to a main-sequence star.


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

Regulus 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:

177.6 arcsec

Alternative designations of Regulus

α Leonis
(alpha Leonis)