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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: 7:51  
clear_day Transit: 11:50  
SunsetSet: 15:49 south
sunny DaytimeWhat's Visible Now?
All Constellations » Coma Berenices » 


Altitude: 28.1°   Azimuth: 271.7°   Direction: West

HR4812 is a double giant star in the constellation of Coma Berenices.

HR4812 visual magnitude is 6.38. Because of its reltive faintness, HR4812 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 HR4812:


HR4812 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 28.1°
Azimuth: 271.7°
Direction: West

Celestial coordinates and finder chart of HR4812

HR4812 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 HR4812 are provided in the following table:

12h 39m 02s
+22° 39’ 33”
Coma Berenices

The simplified sky map below shows the position of HR4812 in the sky:

Finder chart HR4812 star
Simplified finder chart for HR4812.

Visibility of HR4812 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 HR4812 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: 67.3°
Max altitude: 61.2°
Azimuth: 292.7°

Digitized Sky Survey image of HR4812

The image below is a photograph of HR4812 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 HR4812 is -0.05 arcsec per year in Right Ascension and -0.016 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR4812 star
DSS2 image of HR4812. The red arrow shows the motion of HR4812 during the next 10000 years (-8.33 arcmin in Right Ascension and -2.67 arcmin in declination);

Distance of HR4812 from the Sun and relative movement

HR4812 is distant 364.25 light years from the Sun and it is moving towards the Sun at the speed of 27 kilometers per second.

111.73 pc
364.25 ly
-27 km/s
-0.05 arcsec/year
-0.016 arcsec/year

Spectral properties of HR4812

HR4812 belongs to spectral class K1 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR4812 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR4812. Attribution: Richard Powell / CC BY-SA

HR4812 star system properties

HR4812 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 HR4812 double sysyem:

32.8 arcsec

Alternative designations of HR4812