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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:47 
Transit: 12:58 
Sunset: 21:09
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All Constellations » Octans » 

Polaris Australis - σ Octantis (sigma Octantis)

Below the horizon.  Never rises today
Alt: -52.58°   Az: 179.42°   Direction: South

Polaris Australis, also designated as σ Octantis (sigma Octantis), is a variable hypergiant star of spectral class F0 in the constellation of Octans.

Polaris Australis visual magnitude is 5.47. Because of its faintness, Polaris Australis is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

Image of Polaris Australis - σ Octantis (sigma Octantis) star
DSS2 image of Polaris Australis. The red arrow shows the motion of Polaris Australis during the next 10000 years (3.83 arcmin in Right Ascension and 0.83 arcmin in declination);

Celestial Coordinates

Apparent

21h 29m 10s
-88° 50’ 53”
13h 11m 17s
10h 40m 27s

J2000

21h 08m 46s
-88° 57’ 23”

Galactic Coordinates

303.91°
-27.71°

Finder Chart

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Finder chart for Polaris Australis - σ Octantis (sigma Octantis).

Magnitude, Color, Spectral Class

5.47
Hypergiant

0.88
F0III
7658K

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

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

Distance, Radial Speed, Proper Motion

Polaris Australis is distant 270.09 light years from the Sun and it is moving far from the Sun at the speed of 12 kilometers per second.

82.85
270.09
12 km/s
0.023 arcsec/y
0.005"/y

Alternative Designations

Polaris Australis
σ Octantis
(sigma Octantis)
SAO258857
SAO258857

Visibility from Your Location

Polaris Australis - σ Octantis (sigma Octantis) is currently not visible from Greenwich, UK