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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: 5:43  
clear_day Transit: 12:56  
SunsetSet: 20:10
sunny DaytimeWhat's Visible Now?
All Constellations » Centaurus » 


Altitude: -45.1°   Azimuth: 107.1°   Direction: East-South-East

HR4991 is a giant star in the constellation of Centaurus.

HR4991 visual magnitude is 6.16. Because of its reltive faintness, HR4991 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 HR4991 is -0.17 arcsec per year in Right Ascension and 0.028 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of HR4991 star
DSS2 image of HR4991. The red arrow shows the motion of HR4991 during the next 1000 years (-2.83 arcmin in Right Ascension and 0.47 arcmin in declination);

Key facts about HR4991


HR4991 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -45.1°
Azimuth: 107.1°
Direction: East-South-East

Celestial coordinates and finder chart of HR4991

HR4991 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 HR4991 are provided in the following table:

13h 13m 57s
-43° 08’ 20”

The simplified sky map below shows the position of HR4991 in the sky:

Finder chart HR4991 star
Simplified finder chart for HR4991.

Visibility of HR4991 from your location

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

HR4991 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR4991 from the Sun and relative movement

HR4991 is distant 350.91 light years from the Sun and it is moving far from the Sun at the speed of 30 kilometers per second.

107.64 pc
350.91 ly
30 km/s
-0.17 arcsec/year
0.028 arcsec/year

Spectral properties of HR4991

HR4991 belongs to spectral class K4 and has a luminosity class of III corresponding to a giant star.


The red dot in the diagram below shows where HR4991 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR4991. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR4991