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: 4:50  
clear_day Transit: 12:56  
SunsetSet: 21:02 south
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All Constellations » Leo » 

45 Leonis

45 Leonis is a variable and multiple hypergiant star in the constellation of Leo.

45 Leonis visual magnitude is 6.04. Because of its reltive faintness, 45 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 45 Leonis:

45 Leonis is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 33°.

Celestial coordinates and finder chart of 45 Leonis

45 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 45 Leonis are provided in the following table:

10h 27m 38s
+09° 45’ 44”

The simplified sky map below shows the position of 45 Leonis in the sky:

Finder chart 45 Leonis star
Simplified finder chart for 45 Leonis.

Visibility of 45 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 45 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: 80.2°
Max altitude: 48.3°
Azimuth: 279.8°
45 Leonis is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 45 Leonis

The image below is a photograph of 45 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 45 Leonis is 0.007 arcsec per year in Right Ascension and 0.002 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of 45 Leonis star
DSS2 image of 45 Leonis. The red arrow shows the motion of 45 Leonis during the next 100000 years (11.67 arcmin in Right Ascension and 3.33 arcmin in declination);

Distance of 45 Leonis from the Sun and relative movement

45 Leonis is distant 384.89 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

118.06 pc
384.89 ly
-8 km/s
0.007 arcsec/year
0.002 arcsec/year

Spectral properties of 45 Leonis

45 Leonis belongs to spectral class A0 45 Leonis is also a SiCr chemically peculiar star.


The red dot in the diagram below shows where 45 Leonis is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of 45 Leonis. Attribution: Richard Powell / CC BY-SA

45 Leonis star system properties

45 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 45 Leonis double sysyem:

37.2 arcsec

Alternative designations of 45 Leonis