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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: 7:45  
clear_day Transit: 11:48  
SunsetSet: 15:51 south
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All Constellations » Cancer » 

Copernicus - ρ1 Cancri (rho1 Cancri)

Altitude: 40.4°   Azimuth: 94.0°   Direction: East

Copernicus, also designated as ρ1 Cancri (rho1 Cancri), is a double main-sequence star in the constellation of Cancer.

Copernicus visual magnitude is 5.95. Because of its reltive faintness, Copernicus 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 Copernicus:


Copernicus - ρ1 Cancri (rho1 Cancri) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 40.4°
Azimuth: 94.0°
Direction: East

Celestial coordinates and finder chart of Copernicus

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

08h 52m 35s
+28° 19’ 50”

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

Finder chart Copernicus - ρ1 Cancri (rho1 Cancri) star
Simplified finder chart for Copernicus - ρ1 Cancri (rho1 Cancri).

Visibility of Copernicus 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 Copernicus - ρ1 Cancri (rho1 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: 61.7°
Max altitude: 66.9°
Azimuth: 298.3°

Digitized Sky Survey image of Copernicus

The image below is a photograph of Copernicus 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 Copernicus is -0.484 arcsec per year in Right Ascension and -0.234 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Copernicus - ρ1 Cancri (rho1 Cancri) star
DSS2 image of Copernicus. The red arrow shows the motion of Copernicus during the next 1000 years (-8.07 arcmin in Right Ascension and -3.90 arcmin in declination);

Distance of Copernicus from the Sun and relative movement

Copernicus is distant 40.85 light years from the Sun and it is moving far from the Sun at the speed of 27 kilometers per second.

12.53 pc
40.85 ly
27 km/s
-0.484 arcsec/year
-0.234 arcsec/year

Spectral properties of Copernicus

Copernicus belongs to spectral class G8 and has a luminosity class of V corresponding to a main-sequence star.


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

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

Copernicus star system properties

Copernicus 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 Copernicus double sysyem:

85 arcsec

Alternative designations of Copernicus

ρ1 Cancri
(rho1 Cancri)
Gl 324 A