Iota Octantis
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Iota Octantis, Latinized, from ι Octantis is a double star[1] in the southern circumpolar constellation Octans. The "A" component has an apparent magnitude of 5.83,[2] making it faintly visible to the naked eye under ideal conditions, but the "B" component can't be seen due to its faintness.[2] The system is located at a distance of 350 light years[3] based on its annual parallax shift, but is drifting away at a rate of Template:Val.[4]
Iota Octantis A has a classification of K0 III,[5] which indicates that it is an evolved K-type star that exhausted hydrogen at its core and left the main sequence. It has an angular diameter of Template:Val,[6] which yields a radius 12.43 times that of the Sun at its estimated distance.[7] At present Iota Octantis A has 2.49 times the mass of the Sun[8] and radiates at 81 times the luminosity of the Sun[8] from its enlarged photosphere at an effective temperature of Template:Val,[8] which gives it an orangish-yellow hue. Iota Octantis is metal deficient[8] and spins slowly with a projected rotational velocity of Template:Val.[9]
Eggleton et al. states that both stars have similar spectral types,[1] but there is a faint tenth magnitude companion with a classification of F8 located Template:Val away,[10] which is unrelated to the two.
References
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