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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: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
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All Constellations » Coma Berenices » 

31 Comae Berenices

Altitude: -10.3°   Azimuth: 11.0°   Direction: North

31 Comae Berenices is a variable hypergiant star in the constellation of Coma Berenices.

31 Comae Berenices visual magnitude is 4.94. Because of its moderate brightness, 31 Comae Berenices 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 31 Comae Berenices:


31 Comae Berenices is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -10.3°
Azimuth: 11.0°
Direction: North

Celestial coordinates and finder chart of 31 Comae Berenices

31 Comae Berenices 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 31 Comae Berenices are provided in the following table:

12h 51m 41s
+27° 32’ 26”
Coma Berenices

The simplified sky map below shows the position of 31 Comae Berenices in the sky:

Finder chart 31 Comae Berenices star
Simplified finder chart for 31 Comae Berenices.

Visibility of 31 Comae Berenices 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 31 Comae Berenices 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: 62.5°
Max altitude: 66.1°
Azimuth: 297.5°

Digitized Sky Survey image of 31 Comae Berenices

The image below is a photograph of 31 Comae Berenices 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 31 Comae Berenices is -0.012 arcsec per year in Right Ascension and -0.008 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 31 Comae Berenices star
DSS2 image of 31 Comae Berenices. The red arrow shows the motion of 31 Comae Berenices during the next 10000 years (-2.00 arcmin in Right Ascension and -1.33 arcmin in declination);

Distance of 31 Comae Berenices from the Sun and relative movement

31 Comae Berenices is distant 306.97 light years from the Sun and it is moving towards the Sun at the speed of 1 kilometers per second.

94.16 pc
306.97 ly
-1 km/s
-0.012 arcsec/year
-0.008 arcsec/year

Spectral properties of 31 Comae Berenices

31 Comae Berenices belongs to spectral class G0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where 31 Comae Berenices is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 31 Comae Berenices. Attribution: Richard Powell / CC BY-SA

Alternative designations of 31 Comae Berenices

31 Comae Berenices