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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
north SunriseRise: 7:38  
clear_day Transit: 11:46  
SunsetSet: 15:54 south
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All Constellations » Ara » 

θ Arae (theta Arae)

Altitude: -35.8°   Azimuth: 232.2°   Direction: South-West

θ Arae is a supergiant star in the constellation of Ara.

θ Arae visual magnitude is 3.66. Because of its moderate brightness, θ Arae should be easily visible from locations with dark skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about θ Arae:


θ Arae (theta Arae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -35.8°
Azimuth: 232.2°
Direction: South-West

Celestial coordinates and finder chart of θ Arae

θ 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 θ Arae are provided in the following table:

18h 06m 37s
-50° 05’ 30”

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

Finder chart θ Arae (theta Arae) star
Simplified finder chart for θ Arae (theta Arae).

Visibility of θ Arae from your location

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

θ Arae (theta Arae) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of θ Arae

The image below is a photograph of θ Arae 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 θ Arae is -0.01 arcsec per year in Right Ascension and -0.014 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of θ Arae (theta Arae) star
DSS2 image of θ Arae. The red arrow shows the motion of θ Arae during the next 10000 years (-1.67 arcmin in Right Ascension and -2.33 arcmin in declination);

Distance of θ Arae from the Sun and relative movement

θ Arae is distant 1,012.42 light years from the Sun and it is moving far from the Sun at the speed of 3 kilometers per second.

310.56 pc
1,012.42 ly
3 km/s
-0.01 arcsec/year
-0.014 arcsec/year

Spectral properties of θ Arae

θ Arae belongs to spectral class B2 and has a luminosity class of I corresponding to a supergiant star.


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

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

Alternative designations of θ Arae

θ Arae
(theta Arae)