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: 4:44  
clear_day Transit: 12:57  
SunsetSet: 21:11 south
sunny DaytimeWhat's Visible Now
All Constellations » Coma Berenices » 


Altitude: 2.1°   Azimuth: 54.7°   Direction: North-East

HR4873 is a hypergiant star in the constellation of Coma Berenices.

HR4873 visual magnitude is 6.43. Because of its reltive faintness, HR4873 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 HR4873:


HR4873 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.1°
Azimuth: 54.7°
Direction: North-East

Celestial coordinates and finder chart of HR4873

HR4873 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 HR4873 are provided in the following table:

12h 50m 17s
+22° 51’ 47”
Coma Berenices

The simplified sky map below shows the position of HR4873 in the sky:

Finder chart HR4873 star
Simplified finder chart for HR4873.

Visibility of HR4873 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 HR4873 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: 67.1°
Max altitude: 61.4°
Azimuth: 292.9°
HR4873 is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of HR4873

The image below is a photograph of HR4873 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 HR4873 is 0.109 arcsec per year in Right Ascension and -0.069 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4873 star
DSS2 image of HR4873. The red arrow shows the motion of HR4873 during the next 1000 years (1.82 arcmin in Right Ascension and -1.15 arcmin in declination);

Distance of HR4873 from the Sun and relative movement

HR4873 is distant 435.25 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

133.51 pc
435.25 ly
6 km/s
0.109 arcsec/year
-0.069 arcsec/year

Spectral properties of HR4873

HR4873 belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.


The red dot in the diagram below shows where HR4873 is situated in the Hertzsprungā€“Russell diagram.

HR Diagram
H-R diagram showing the position of HR4873. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4873