The Constellation Octans

by Dominic Ford
Octans Octans
The constellation Octans. Roll mouse over to see labels.
Source: Stellarium.

Octans is a faint constellation in the southern sky, most notable for containing the south celestial pole.

Whereas the north celestial pole lies close to the pole star Polaris, the south celestial pole lies in a dark area of the sky. Octans contains only one star brighter than fourth magnitude, and there are no stars visible to the naked eye within a degree of the pole.

Octans is named after the octant, a compact form of quadrant used for measuring the angles between stars. The name was applied to this sky area by Nicolas Louis de Lacaille in 1756, as one of fourteen constellations which celebrate tools.

Lying away from the plane of the Milky Way, Octans contains no bright deep sky objects.

Date First Appeared
1756 (Lacaille)
Sky Area
0.7% of the sky
291.0 square degrees
Messier Objects
Octans contains no Messier objects
Caldwell Objects
Octans contains no Caldwell objects
The following constellations neighbor Octans: Apus, Chamaeleon, Hydrus, Indus, Mensa, Pavo, Tucana.
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Brightest Objects in Octans

Stars Open Clusters Globular Clusters Galaxies
Stars Open Clusters Globular Clusters Galaxies
ν-Oct (mag 3.7) IC 4333 (mag 0.0)
β-Oct (mag 4.1) NGC 6557 (mag 0.0)
δ-Oct (mag 4.3) IC 5022 (mag 0.0)
θ-Oct (mag 4.8) IC 4864 (mag 0.0)
γ¹-Oct (mag 5.1) NGC 6920 (mag 0.0)
α-Oct (mag 5.1) IC 5025 (mag 0.0)
ε-Oct (mag 5.2) NGC 7637 (mag 0.0)
χ-Oct (mag 5.3) IC 4912 (mag 0.0)
γ³-Oct (mag 5.3) NGC 7095 (mag 0.0)
ξ-Oct (mag 5.3) IC 5026 (mag 0.0)
ζ-Oct (mag 5.4) NGC 7098 (mag 11.4)
σ-Oct (mag 5.4) NGC 6438 (mag 11.6)
φ-Oct (mag 5.5) NGC 2573 (mag 13.5)
HD (mag 5.5)
ψ-Oct (mag 5.5)
τ-Oct (mag 5.5)
ι-Oct (mag 5.5)
κ-Oct (mag 5.6)
ρ-Oct (mag 5.6)
π¹-Oct (mag 5.6)
π²-Oct (mag 5.7)
HD 11025 (mag 5.7)
γ²-Oct (mag 5.7)
HD 222806 (mag 5.7)
υ-Oct (mag 5.8)




Color scheme