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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: 7:03  
clear_day Transit: 12:12  
SunsetSet: 17:22
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All Constellations » Centaurus » 

ο1 Centauri (omicron1 Centauri)

Altitude: -44.3°   Azimuth: 134.9°   Direction: South-East

ο1 Centauri is a variable and double supergiant star in the constellation of Centaurus.

ο1 Centauri visual magnitude is 5.13. Because of its reltive faintness, ο1 Centauri should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of ο1 Centauri is -0.005 arcsec per year in Right Ascension and -0.005 arcsec per year in Declination and the associated displacement for the next 100000 years is represented with the red arrow.

Image of ο1 Centauri (omicron1 Centauri) star
DSS2 image of ο1 Centauri. The red arrow shows the motion of ο1 Centauri during the next 100000 years (-8.33 arcmin in Right Ascension and -8.33 arcmin in declination);

Key facts about ο1 Centauri


ο1 Centauri (omicron1 Centauri) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -44.3°
Azimuth: 134.9°
Direction: South-East

Celestial coordinates and finder chart of ο1 Centauri

ο1 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 ο1 Centauri are provided in the following table:

11h 31m 46s
-59° 26’ 31”

The simplified sky map below shows the position of ο1 Centauri in the sky:

Finder chart ο1 Centauri (omicron1 Centauri) star
Simplified finder chart for ο1 Centauri (omicron1 Centauri).

Visibility of ο1 Centauri from your location

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

ο1 Centauri (omicron1 Centauri) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of ο1 Centauri from the Sun and relative movement

ο1 Centauri is distant 3,227.72 light years from the Sun and it is moving towards the Sun at the speed of 20 kilometers per second.

990.10 pc
3,227.72 ly
-20 km/s
-0.005 arcsec/year
-0.005 arcsec/year

Spectral properties of ο1 Centauri

ο1 Centauri belongs to spectral class G3 and has a luminosity class of I corresponding to a supergiant star.


The red dot in the diagram below shows where ο1 Centauri is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of ο1 Centauri. Attribution: Richard Powell / CC BY-SA

ο1 Centauri star system properties

ο1 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 ο1 Centauri double sysyem:

13.3 arcsec

Alternative designations of ο1 Centauri

ο1 Centauri
(omicron1 Centauri)