When is the best time to observe Iota Trianguli Australis?

Iota Trianguli Australis is best observed from April through June, with peak visibility during May when it transits around midnight in the Northern Hemisphere.

Where is Iota Trianguli Australis located in the sky?

Iota Trianguli Australis lies in the constellation Triangulum Australe at right ascension 16h 28m and declination -64° 03′.

What telescope do I need to split Iota Trianguli Australis?

Splitting Iota Trianguli Australis requires an aperture of roughly 60 mm or larger — the components are separated by about 16.6″ at magnitudes near 5.3. The companion is about 4.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Iota Trianguli Australis — Double Star in Triangulum Australe

Magnitude 5.3^m DoubleStar Triangulum Australe (TrA) Visible

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Observe

1Physical Properties

Magnitude 5.27

Spectral Type F4IV subgiant

Star Color Yellow-white (B-V 0.36)

Distance 112 ly

2Position & Identifiers

RA 16h 27m 57.3s

Dec -64° 03' 29.0"

Constellation Triangulum Australe (TrA)

HR 6109

HIP 80645

HD 147787

SAO 253555

Bayer Iota

SIMBAD

3How easy to split?

Primary 5.3 mag Companion 9.4 mag Separation 16.6″

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

Easy Medium Hard Very hard Impossible

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

4Visibility

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Best season Apr – Jun (peak: May)

5Multiple Star System

Separation 16.6″

Companion Mag 9.4

Position Angle 2°

Star Colors A: Yellow-white B: Orange

Discoverer DUN 201

Separation over time

Measured 1826 → 2015 (189 y)

Separation drift 14.0" → 16.6" (+2.60")

Rate +0.0138" / y

PA drift 32° → 2° (-30°, -0.159°/y)

Slow change over generations — observable in lifetime comparisons.

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.