When is the best time to observe Iota Octantis?

Iota Octantis is best observed from February through April, with peak visibility during March when it transits around midnight in the Northern Hemisphere.

Where is Iota Octantis located in the sky?

Iota Octantis lies in the constellation Octans at right ascension 12h 55m and declination -85° 07′.

What telescope do I need to split Iota Octantis?

Splitting Iota Octantis requires an aperture of roughly 320 mm or larger — the components are separated by about 0.7″ at magnitudes near 5.5. Larger apertures and steady seeing help resolve the pair cleanly.

Iota Octantis — Double Star in Octans

Magnitude 5.5^m DoubleStar Octans (Oct) Visible

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Observe

1Physical Properties

Magnitude 5.46

Spectral Type K0III giant

Star Color Orange (B-V 1.02)

2Position & Identifiers

RA 12h 54m 58.6s

Dec -85° 07' 24.0"

Constellation Octans (Oct)

HR 4870

HIP 63031

HD 111482

SAO 258654

Bayer Iota

SIMBAD

3How easy to split?

Primary 5.5 mag Companion 6.9 mag Separation 0.7″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard	V. hard	V. hard
150 mm Newton 150mm Newt.	V. hard+	V. hard+	V. hard+
Celestron C8 (203 mm SCT) C8 203mm	Hard	Hard	Hard

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

To reach "Medium" at Bortle 3, you'd need at least a 320 mm reflector.

4Visibility

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Best season Feb – Apr (peak: Mar)

5Multiple Star System C: optical

Separation 0.7″

Companion Mag 6.9

Companion Sp F8

Position Angle 240°

Star Colors A: Orange B: Yellow

Discoverer RST2819

Notes

Equal components.

Separation over time

Measured 1935 → 2019 (84 y)

Separation drift 0.70" → 0.70" (+0.00")

Rate +0.0000" / y

PA drift 227° → 240° (+13°, +0.155°/y)

Essentially fixed on human timescales — the same view your grandchildren will see.

Measured from the WDS observational archive. No orbital solution has been derived — most likely the period is too long to fit an orbit to the available measurement arc.