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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
sleep NighttimeWhat's Visible Now?
All Constellations » Cancer » 

ο1 Cancri (omicron1 Cancri)

Altitude: 26.6°   Azimuth: 98.9°   Direction: East

ο1 Cancri is a giant star in the constellation of Cancer.

ο1 Cancri visual magnitude is 5.2. Because of its reltive faintness, ο1 Cancri should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about ο1 Cancri:


ο1 Cancri (omicron1 Cancri) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 26.6°
Azimuth: 98.9°
Direction: East

Celestial coordinates and finder chart of ο1 Cancri

ο1 Cancri 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 Cancri are provided in the following table:

08h 57m 14s
+15° 19’ 22”

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

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

Visibility of ο1 Cancri 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 Cancri (omicron1 Cancri) 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: 74.7°
Max altitude: 53.8°
Azimuth: 285.3°

Digitized Sky Survey image of ο1 Cancri

The image below is a photograph of ο1 Cancri 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 Cancri is 0.056 arcsec per year in Right Ascension and 0.017 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of ο1 Cancri (omicron1 Cancri) star
DSS2 image of ο1 Cancri. The red arrow shows the motion of ο1 Cancri during the next 10000 years (9.33 arcmin in Right Ascension and 2.83 arcmin in declination);

Distance of ο1 Cancri from the Sun and relative movement

ο1 Cancri is distant 159.88 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

49.04 pc
159.88 ly
-5 km/s
0.056 arcsec/year
0.017 arcsec/year

Spectral properties of ο1 Cancri

ο1 Cancri belongs to spectral class A5 and has a luminosity class of III corresponding to a giant star.


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

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

Alternative designations of ο1 Cancri

ο1 Cancri
(omicron1 Cancri)