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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
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All Constellations » Triangulum Australe » 

Atria - α Trianguli Australis (alpha Trianguli Australis)

Altitude: -34.8°   Azimuth: 162.2°   Direction: South-South-East

Atria, also designated as α Trianguli Australis (alpha Trianguli Australis), is a bright giant star in the constellation of Triangulum Australe.

Atria visual magnitude is 1.92, making it the 41th brightest star in the sky. Thanks to its high brightness, Atria is clearly visible when observed from locations with dark skyes, and should be also quite easily visible from light polluted areas.

The table below summarizes the key facts about Atria:

Bright giant

Atria - α Trianguli Australis (alpha Trianguli Australis) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -34.8°
Azimuth: 162.2°
Direction: South-South-East

Celestial coordinates and finder chart of Atria

Atria 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 Atria are provided in the following table:

16h 48m 39s
-69° 01’ 40”
Triangulum Australe

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

Finder chart Atria - α Trianguli Australis (alpha Trianguli Australis) star
Simplified finder chart for Atria - α Trianguli Australis (alpha Trianguli Australis).

Visibility of Atria from your location

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

Atria - α Trianguli Australis (alpha Trianguli Australis) is currently not visible from Greenwich, United Kingdom edit_location_alt

Digitized Sky Survey image of Atria

The image below is a photograph of Atria 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 Atria is 0.014 arcsec per year in Right Ascension and -0.034 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of Atria - α Trianguli Australis (alpha Trianguli Australis) star
DSS2 image of Atria. The red arrow shows the motion of Atria during the next 10000 years (2.33 arcmin in Right Ascension and -5.67 arcmin in declination);

Distance of Atria from the Sun and relative movement

Atria is distant 415.29 light years from the Sun and it is moving towards the Sun at the speed of 3 kilometers per second.

127.39 pc
415.29 ly
-3 km/s
0.014 arcsec/year
-0.034 arcsec/year

Spectral properties of Atria

Atria belongs to spectral class K2 and has a luminosity class of II corresponding to a bright giant star.


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

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

Alternative designations of Atria

α Trianguli Australis
(alpha Trianguli Australis)