Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 4:46  
clear_day Transit: 12:56  
SunsetSet: 21:07 south
wb_twilight Astronomical TwilightWhat's Visible Now
All Constellations » Coma Berenices » 

18 Comae Berenices

Altitude: 36.5°   Azimuth: 263.5°   Direction: West

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

18 Comae Berenices visual magnitude is 5.48. Because of its reltive faintness, 18 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 18 Comae Berenices:


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

Altitude: 36.5°
Azimuth: 263.5°
Direction: West

Celestial coordinates and finder chart of 18 Comae Berenices

18 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 18 Comae Berenices are provided in the following table:

12h 29m 26s
+24° 06’ 32”
Coma Berenices

The simplified sky map below shows the position of 18 Comae Berenices in the sky:

Finder chart 18 Comae Berenices star
Simplified finder chart for 18 Comae Berenices.

Visibility of 18 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 18 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: 65.9°
Max altitude: 62.6°
Azimuth: 294.1°
18 Comae Berenices is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 18 Comae Berenices

The image below is a photograph of 18 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 18 Comae Berenices is -0.031 arcsec per year in Right Ascension and -0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 18 Comae Berenices star
DSS2 image of 18 Comae Berenices. The red arrow shows the motion of 18 Comae Berenices during the next 10000 years (-5.17 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of 18 Comae Berenices from the Sun and relative movement

18 Comae Berenices is distant 215.89 light years from the Sun and it is moving far from the Sun at the speed of 25 kilometers per second.

66.23 pc
215.89 ly
25 km/s
-0.031 arcsec/year
-0.001 arcsec/year

Spectral properties of 18 Comae Berenices

18 Comae Berenices belongs to spectral class F5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where 18 Comae Berenices is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of 18 Comae Berenices. Attribution: Richard Powell / CC BY-SA

Alternative designations of 18 Comae Berenices

18 Comae Berenices