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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
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All Constellations » Canis Major » 

Aludra - η Canis Majoris (eta Canis Majoris)

Altitude: -34.6°   Azimuth: 264.9°   Direction: West

Aludra, also designated as η Canis Majoris (eta Canis Majoris), is a double supergiant star in the constellation of Canis Major.

Aludra visual magnitude is 2.45, making it the 88th brightest star in the sky. Thanks to its high brightness, Aludra is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Aludra:


Aludra - η Canis Majoris (eta Canis Majoris) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -34.6°
Azimuth: 264.9°
Direction: West

Celestial coordinates and finder chart of Aludra

Aludra 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 Aludra are provided in the following table:

07h 24m 05s
-29° 18’ 11”
Canis Major

The simplified sky map below shows the position of Aludra in the sky:

Finder chart Aludra - η Canis Majoris (eta Canis Majoris) star
Simplified finder chart for Aludra - η Canis Majoris (eta Canis Majoris).

Visibility of Aludra 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 Aludra - η Canis Majoris (eta Canis Majoris) 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: 119.3°
Max altitude: 9.2°
Azimuth: 240.7°

Digitized Sky Survey image of Aludra

The image below is a photograph of Aludra 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 Aludra is -0.004 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 Aludra - η Canis Majoris (eta Canis Majoris) star
DSS2 image of Aludra. The red arrow shows the motion of Aludra during the next 100000 years (-6.67 arcmin in Right Ascension and 8.33 arcmin in declination);

Distance of Aludra from the Sun and relative movement

Aludra is distant 3,196.08 light years from the Sun and it is moving far from the Sun at the speed of 41 kilometers per second.

980.39 pc
3,196.08 ly
41 km/s
-0.004 arcsec/year
0.005 arcsec/year

Spectral properties of Aludra

Aludra belongs to spectral class B5 and has a luminosity class of I corresponding to a supergiant star.


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

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

Aludra star system properties

Aludra is a visual double star which can be observed with the help of small or medium telescopes. The table below shows key information about the Aludra double sysyem:

178.7 arcsec

Alternative designations of Aludra

η Canis Majoris
(eta Canis Majoris)
31 Canis Majoris