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Octans(ok -tanz) (Octant) An inconspicuous constellation containing and surrounding the south celestial pole, the brightest stars being of 3rd magnitude. The faint (5th-magnitude) Sigma (σ) Octantis is the nearest naked-eye star to the south pole. Abbrev.: Oct; genitive form: Octantis; approx. position: RA 0 – 24h, dec –80°; area: 291 sq deg.
a polar constellation of the southern hemisphere. The brightest star in Octans has a visual magnitude of 3.8. The constellation is not visible in the USSR. The south celestial pole is located in Octans.
The constellation that includes the south celestial pole. Also known as Octant.