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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: 6:42  
clear_day Transit: 12:10  
SunsetSet: 17:40
sunny DaytimeWhat's Visible Now?
All Constellations » Centaurus » 


Altitude: -80.3°   Azimuth: 24.1°   Direction: North-North-East

HR4721 is a giant star in the constellation of Centaurus.

HR4721 visual magnitude is 6.11. Because of its reltive faintness, HR4721 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 HR4721 is -0.13 arcsec per year in Right Ascension and -0.022 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4721 star
DSS2 image of HR4721. The red arrow shows the motion of HR4721 during the next 1000 years (-2.17 arcmin in Right Ascension and -0.37 arcmin in declination);

Key facts about HR4721


HR4721 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -80.3°
Azimuth: 24.1°
Direction: North-North-East

Celestial coordinates and finder chart of HR4721

HR4721 is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR4721 are provided in the following table:

12h 25m 08s
-42° 30’ 51”

The simplified sky map below shows the position of HR4721 in the sky:

Finder chart HR4721 star
Simplified finder chart for HR4721.

Visibility of HR4721 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR4721 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR4721 from the Sun and relative movement

HR4721 is distant 171.94 light years from the Sun and it is moving far from the Sun at the speed of 34 kilometers per second.

52.74 pc
171.94 ly
34 km/s
-0.13 arcsec/year
-0.022 arcsec/year

Spectral properties of HR4721

HR4721 belongs to spectral class G5 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR4721 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4721. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4721