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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
north SunriseRise: 7:54  
clear_day Transit: 11:51  
SunsetSet: 15:49 south
sleep NighttimeWhat's Visible Now?
All Constellations » Leo » 

23 Leonis

Altitude: 4.4°   Azimuth: 74.5°   Direction: East-North-East

23 Leonis is a hypergiant star in the constellation of Leo.

23 Leonis visual magnitude is 6.46. Because of its reltive faintness, 23 Leonis should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 23 Leonis:


23 Leonis is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 4.4°
Azimuth: 74.5°
Direction: East-North-East

Celestial coordinates and finder chart of 23 Leonis

23 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 23 Leonis are provided in the following table:

09h 51m 02s
+13° 03’ 57”

The simplified sky map below shows the position of 23 Leonis in the sky:

Finder chart 23 Leonis star
Simplified finder chart for 23 Leonis.

Visibility of 23 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 23 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: 76.9°
Max altitude: 51.6°
Azimuth: 283.1°

Digitized Sky Survey image of 23 Leonis

The image below is a photograph of 23 Leonis 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 23 Leonis is 0.028 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 23 Leonis star
DSS2 image of 23 Leonis. The red arrow shows the motion of 23 Leonis during the next 10000 years (4.67 arcmin in Right Ascension and -1.33 arcmin in declination);

Distance of 23 Leonis from the Sun and relative movement

23 Leonis is distant 1,852.27 light years from the Sun and it is moving towards the Sun at the speed of 9 kilometers per second.

568.18 pc
1,852.27 ly
-9 km/s
0.028 arcsec/year
-0.008 arcsec/year

Spectral properties of 23 Leonis

23 Leonis belongs to spectral class M0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 23 Leonis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 23 Leonis. Attribution: Richard Powell / CC BY-SA

Alternative designations of 23 Leonis