We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Donate now and help us to keep this site free and ad-free!
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:47  
clear_day Transit: 11:49  
SunsetSet: 15:50 south
sleep NighttimeWhat's Visible Now?
All Constellations » Coma Berenices » 

30 Comae Berenices

Altitude: 25.9°   Azimuth: 77.6°   Direction: East-North-East

30 Comae Berenices is a double main-sequence star in the constellation of Coma Berenices.

30 Comae Berenices visual magnitude is 5.78. Because of its reltive faintness, 30 Comae Berenices 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 30 Comae Berenices:


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

Altitude: 25.9°
Azimuth: 77.6°
Direction: East-North-East

Celestial coordinates and finder chart of 30 Comae Berenices

30 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 30 Comae Berenices are provided in the following table:

12h 49m 17s
+27° 33’ 07”
Coma Berenices

The simplified sky map below shows the position of 30 Comae Berenices in the sky:

Finder chart 30 Comae Berenices star
Simplified finder chart for 30 Comae Berenices.

Visibility of 30 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 30 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: 62.4°
Max altitude: 66.1°
Azimuth: 297.6°

Digitized Sky Survey image of 30 Comae Berenices

The image below is a photograph of 30 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 30 Comae Berenices is -0.096 arcsec per year in Right Ascension and 0.021 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of 30 Comae Berenices star
DSS2 image of 30 Comae Berenices. The red arrow shows the motion of 30 Comae Berenices during the next 1000 years (-1.60 arcmin in Right Ascension and 0.35 arcmin in declination);

Distance of 30 Comae Berenices from the Sun and relative movement

30 Comae Berenices is distant 326.98 light years from the Sun

100.30 pc
326.98 ly
-0.096 arcsec/year
0.021 arcsec/year

Spectral properties of 30 Comae Berenices

30 Comae Berenices belongs to spectral class A2 and has a luminosity class of V corresponding to a main-sequence star.


The red dot in the diagram below shows where 30 Comae Berenices is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 30 Comae Berenices. Attribution: Richard Powell / CC BY-SA

30 Comae Berenices star system properties

30 Comae Berenices 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 30 Comae Berenices double sysyem:

42.5 arcsec

Alternative designations of 30 Comae Berenices

30 Comae Berenices