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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: 6:48  
clear_day Transit: 12:11  
SunsetSet: 17:34
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All Constellations » Ara » 

α Arae (alpha Arae)

Altitude: -11.4°   Azimuth: 183.0°   Direction: South

α Arae is a variable and double main-sequence star in the constellation of Ara.

α Arae visual magnitude is 2.95. Thanks to its high brightness, α Arae is clearly visible when observed from locations with dark skies, and should be also quite easily visible from light polluted areas.

The proper motion of α Arae is -0.031 arcsec per year in Right Ascension and -0.07 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of α Arae (alpha Arae) star
DSS2 image of α Arae. The red arrow shows the motion of α Arae during the next 10000 years (-5.17 arcmin in Right Ascension and -11.67 arcmin in declination);

Key facts about α Arae


α Arae (alpha Arae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -11.4°
Azimuth: 183.0°
Direction: South

Celestial coordinates and finder chart of α Arae

α Arae 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 α Arae are provided in the following table:

17h 31m 50s
-49° 52’ 33”

The simplified sky map below shows the position of α Arae in the sky:

Finder chart α Arae (alpha Arae) star
Simplified finder chart for α Arae (alpha Arae).

Visibility of α Arae from your location

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

α Arae (alpha Arae) is currently not visible from Greenwich, United Kingdom edit_location_alt

Distance of α Arae from the Sun and relative movement

α Arae is distant 242.20 light years from the Sun

74.29 pc
242.20 ly
-0.031 arcsec/year
-0.07 arcsec/year

Spectral properties of α Arae

α Arae belongs to spectral class B2 and has a luminosity class of V corresponding to a main-sequence star.


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

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

α Arae star system properties

α Arae 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 α Arae double sysyem:

55.6 arcsec

Alternative designations of α Arae

α Arae
(alpha Arae)