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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
SunriseRise: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
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All Constellations » Centaurus » 

λ Centauri (lambda Centauri)

Altitude: -69.5°   Azimuth: 223.5°   Direction: South-West

λ Centauri is a double giant star in the constellation of Centaurus.

λ Centauri visual magnitude is 3.13. Because of its moderate brightness, λ Centauri should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of λ Centauri is -0.041 arcsec per year in Right Ascension and -0.005 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of λ Centauri (lambda Centauri) star
DSS2 image of λ Centauri. The red arrow shows the motion of λ Centauri during the next 10000 years (-6.83 arcmin in Right Ascension and -0.83 arcmin in declination);

Key facts about λ Centauri

3.13
Giant

λ Centauri (lambda Centauri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -69.5°
Azimuth: 223.5°
Direction: South-West

Celestial coordinates and finder chart of λ Centauri

λ Centauri is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of λ Centauri are provided in the following table:

11h 35m 46s
-63° 01’ 10”
294.47°
-1.4°
Centaurus

The simplified sky map below shows the position of λ Centauri in the sky:

Finder chart λ Centauri (lambda Centauri) star
Simplified finder chart for λ Centauri (lambda Centauri).

Visibility of λ Centauri from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

λ Centauri (lambda Centauri) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of λ Centauri from the Sun and relative movement

λ Centauri is distant 409.55 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

125.63 pc
409.55 ly
-1 km/s
-0.041 arcsec/year
-0.005 arcsec/year

Spectral properties of λ Centauri

λ Centauri belongs to spectral class B9 and has a luminosity class of III corresponding to a giant star.

-2.37
B9III
10653K

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

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

λ Centauri star system properties

λ Centauri 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 λ Centauri double sysyem:

3.13
11.33
8.2
16.3 arcsec

Alternative designations of λ Centauri

λ Centauri
(lambda Centauri)
SAO251472
SAO251472