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

Right Ascension 21h 29m 10s

Declination -88° 50’ 53”

Hour Angle 13h 11m 17s

Sidereal Time 10h 40m 27s

J2000

Right Ascension 21h 08m 46s

Declination -88° 57’ 23”

Galactic Coordinates

Galactic Longitude 303.91°

Galactic Latitude -27.71°

Finder Chart

Loading map...

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

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.47

Class Hypergiant

Absolute magnitude 0.88

Spectral Type F0III

Color Index (B-V) 0.27

Temperature 7658K

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

Distance (parsec) 82.85

Distance (light year) 270.09

Radial Speed 12 km/s

Proper Motion RA 0.023 arcsec/y

Proper Motion Dec 0.005"/y

Alternative Designations

Proper Name Polaris Australis

Bayer designation σ Octantis
(sigma Octantis)

Henry Draper Catalogue HD177482

SAO Catalogue SAO258857

Hipparcos Catalogue HIP104382

Durchmusterung Catalogue CP-89 47

FK5 Catalogue 923

General Catalogue of Variable Stars Sig Oct

Visibility from Your Location

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

Set Location

Other stars in Octans