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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: 7:01  
clear_day Transit: 12:12  
SunsetSet: 17:24
sunny DaytimeWhat's Visible Now?
All Constellations » Grus » 


Altitude: -10.7°   Azimuth: 154.6°   Direction: South-South-East

HR8639 is a variable hypergiant star in the constellation of Grus.

HR8639 visual magnitude is 6.07. Because of its reltive faintness, HR8639 should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The proper motion of HR8639 is 0.042 arcsec per year in Right Ascension and 0.037 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR8639 star
DSS2 image of HR8639. The red arrow shows the motion of HR8639 during the next 10000 years (7.00 arcmin in Right Ascension and 6.17 arcmin in declination);

Key facts about HR8639


HR8639 is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -10.7°
Azimuth: 154.6°
Direction: South-South-East

Celestial coordinates and finder chart of HR8639

HR8639 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 HR8639 are provided in the following table:

22h 42m 43s
-44° 14’ 52”

The simplified sky map below shows the position of HR8639 in the sky:

Finder chart HR8639 star
Simplified finder chart for HR8639.

Visibility of HR8639 from your location

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

HR8639 is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of HR8639 from the Sun and relative movement

HR8639 is distant 319.92 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

98.14 pc
319.92 ly
6 km/s
0.042 arcsec/year
0.037 arcsec/year

Spectral properties of HR8639

HR8639 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 HR8639 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR8639. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR8639