Star in the constellation of Octans
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Evolutionary stage
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
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Eta Octantis, Latinized from η Octantis, is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.19, making it faintly visible to the naked eye. The object is situated at a distance of 358 light years but is approaching the Solar System with a heliocentric radial velocity of .
Eta Octantis has a stellar classification of A1 Va, indicating that it is an ordinary A-type main sequence star. At present it has 2.37 times the Sun's mass and 2.6 times the Sun's radius. It shines with a luminosity of from its photosphere at an effective temperature of 9,500 K, giving a white hue. Eta Octantis is a rapidly rotating star, with a projected rotational velocity of , and is estimated to be 547 million years old, having completed 72% of its main sequence lifetime.
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