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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
SunriseRise: 6:35  
clear_day Transit: 12:10  
SunsetSet: 17:45
sunny DaytimeWhat's Visible Now?
All Constellations » Coma Berenices » 

40 Comae Berenices

Altitude: 15.5°   Azimuth: 287.0°   Direction: West-North-West

40 Comae Berenices is a variable giant star in the constellation of Coma Berenices.

40 Comae Berenices visual magnitude is 5.6. Because of its reltive faintness, 40 Comae Berenices should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of 40 Comae Berenices is 0.025 arcsec per year in Right Ascension and -0.049 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 40 Comae Berenices star
DSS2 image of 40 Comae Berenices. The red arrow shows the motion of 40 Comae Berenices during the next 10000 years (4.17 arcmin in Right Ascension and -8.17 arcmin in declination);

Key facts about 40 Comae Berenices


40 Comae Berenices is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 15.5°
Azimuth: 287.0°
Direction: West-North-West

Celestial coordinates and finder chart of 40 Comae Berenices

40 Comae Berenices 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 40 Comae Berenices are provided in the following table:

13h 06m 22s
+22° 36’ 57”
Coma Berenices

The simplified sky map below shows the position of 40 Comae Berenices in the sky:

Finder chart 40 Comae Berenices star
Simplified finder chart for 40 Comae Berenices.

Visibility of 40 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 40 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: 67.4°
Max altitude: 61.1°
Azimuth: 292.6°

Distance of 40 Comae Berenices from the Sun and relative movement

40 Comae Berenices is distant 571.93 light years from the Sun and it is moving towards the Sun at the speed of 5 kilometers per second.

175.44 pc
571.93 ly
-5 km/s
0.025 arcsec/year
-0.049 arcsec/year

Spectral properties of 40 Comae Berenices

40 Comae Berenices belongs to spectral class M5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 40 Comae Berenices is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 40 Comae Berenices. Attribution: Richard Powell / CC BY-SA

Alternative designations of 40 Comae Berenices

40 Comae Berenices
Gl 499.1