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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: 7:44  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
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All Constellations » Canis Major » 

ο1 Canis Majoris (omicron1 Canis Majoris)

Altitude: -7.9°   Azimuth: 240.7°   Direction: West-South-West

ο1 Canis Majoris is a variable supergiant star in the constellation of Canis Major.

ο1 Canis Majoris visual magnitude is 3.87. Because of its moderate brightness, ο1 Canis Majoris should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about ο1 Canis Majoris:


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

Altitude: -7.9°
Azimuth: 240.7°
Direction: West-South-West

Celestial coordinates and finder chart of ο1 Canis Majoris

ο1 Canis Majoris 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 ο1 Canis Majoris are provided in the following table:

06h 54m 07s
-24° 11’ 02”
Canis Major

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

Finder chart ο1 Canis Majoris (omicron1 Canis Majoris) star
Simplified finder chart for ο1 Canis Majoris (omicron1 Canis Majoris).

Visibility of ο1 Canis Majoris 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 ο1 Canis Majoris (omicron1 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: 114.2°
Max altitude: 14.3°
Azimuth: 245.8°

Digitized Sky Survey image of ο1 Canis Majoris

The image below is a photograph of ο1 Canis Majoris 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 ο1 Canis Majoris is -0.008 arcsec per year in Right Ascension and 0.013 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ο1 Canis Majoris (omicron1 Canis Majoris) star
DSS2 image of ο1 Canis Majoris. The red arrow shows the motion of ο1 Canis Majoris during the next 10000 years (-1.33 arcmin in Right Ascension and 2.17 arcmin in declination);

Distance of ο1 Canis Majoris from the Sun and relative movement

ο1 Canis Majoris is distant 1,975.76 light years from the Sun and it is moving far from the Sun at the speed of 36 kilometers per second.

606.06 pc
1,975.76 ly
36 km/s
-0.008 arcsec/year
0.013 arcsec/year

Spectral properties of ο1 Canis Majoris

ο1 Canis Majoris belongs to spectral class K2 and has a luminosity class of I corresponding to a supergiant star.


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

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

Alternative designations of ο1 Canis Majoris

ο1 Canis Majoris
(omicron1 Canis Majoris)
16 Canis Majoris