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public LocationGreenwich, UK
Sunrise: 5:15 
Transit: 13:06 
Sunset: 20:56
sunny   (Daytime)   What's Visible Now?
All Constellations » Leo » 

Alterf - λ Leonis (lambda Leonis)

Below the horizon.  Rise: 6:12 | Tran: 14:18 | Set: 22:23
Alt: -3.20°   Az: 45.97°   Direction: North-East

Alterf, also designated as λ Leonis (lambda Leonis), is a variable giant star of spectral class K5 in the constellation of Leo.

Alterf visual magnitude is 4.31. Because of its moderate brightness, Alterf is easily visible to the naked eye from locations with dark skies, while it might be barely visible, or not visible at all, from light-polluted skies.

Image of Alterf - λ Leonis (lambda Leonis) star
DSS2 image of Alterf. The red arrow shows the motion of Alterf during the next 10000 years (-3.50 arcmin in Right Ascension and -5.50 arcmin in declination);

Celestial Coordinates


09h 33m 07s
+22° 51’ 31”
15h 24m 42s
00h 57m 49s


09h 31m 43s
+22° 58’ 05”

Galactic Coordinates


Finder Chart

Finder chart Alterf - λ Leonis (lambda Leonis) star
Simplified finder chart for Alterf - λ Leonis (lambda Leonis).

Magnitude, Color, Spectral Class



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

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

Distance, Radial Speed, Proper Motion

Alterf is distant 336.43 light years from the Sun and it is moving far from the Sun at the speed of 27 kilometers per second.

27 km/s
-0.021 arcsec/y

Alternative Designations

λ Leonis
(lambda Leonis)

Visibility from Your Location

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

Azimuth: 67.1°
Max altitude: 61.4°
Azimuth: 292.9°