5.47
Apparent Mag275
Distance (ly)F0III
Spectral Type7,200
Temperature (K)Sigma Octantis is the closest naked-eye star to the south celestial pole. It is so faint that it is barely visible even in dark skies.
Stellar Data
Apparent Magnitude5.47
Absolute Magnitude0.81
Distance275 light-years
Spectral TypeF0III
Temperature7,200 K
Luminosity25 L☉
Radius2 R☉
Mass1.5 M☉
Right Ascension21h 08m 46.9s
Declination-88° 57′ 23.4″
ConstellationOctans
Notable Facts
- Sigma Octantis is the closest naked-eye star to the south celestial pole
- At magnitude 5.47 it is barely visible in ideal conditions
- It is the southern counterpart to Polaris but far fainter