When is the best time to observe Delta Trianguli Australis?

Delta 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 Delta Trianguli Australis located in the sky?

Delta Trianguli Australis lies in the constellation Triangulum Australe at right ascension 16h 15m and declination -63° 41′.

What telescope do I need to split Delta Trianguli Australis?

Splitting Delta Trianguli Australis requires an aperture of roughly 60 mm or larger — the components are separated by about 37.8″ at magnitudes near 3.9. The companion is about 8.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Delta Trianguli Australis — Double Star in Triangulum Australe

Magnitude 3.9^m DoubleStar Triangulum Australe (TrA) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 3.85

Spectral Type G2Ib-IIa supergiant

Star Color Orange (B-V 1.11)

Distance 607 ly

2Position & Identifiers

RA 16h 15m 26.3s

Dec -63° 41' 08.0"

Constellation Triangulum Australe (TrA)

HR 6030

HIP 79664

HD 145544

SAO 253474

Bayer Delta

SIMBAD

3How easy to split?

Primary 3.9 mag Companion 12.0 mag Separation 37.8″

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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.	Medium	Hard+	Hard
Celestron C8 (203 mm SCT) C8 203mm	Medium+	Medium	Hard+

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 37.8″

Companion Mag 12.0

Position Angle 120°

Star Colors A: Orange

Discoverer R 274

Separation over time

Measured 1891 → 2016 (125 y)

Separation drift 25.0" → 37.8" (+12.80")

Rate +0.1024" / y

PA drift 105° → 120° (+15°, +0.120°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.