When is the best time to observe LP Trianguli Australis?

LP 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 LP Trianguli Australis located in the sky?

LP Trianguli Australis lies in the constellation Triangulum Australe at right ascension 16h 47m and declination -67° 07′.

What telescope do I need to split LP Trianguli Australis?

Splitting LP Trianguli Australis requires an aperture of roughly 60 mm or larger — the components are separated by about 32.7″ at magnitudes near 5.1. The companion is about 6.4 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

LP Trianguli Australis — Double Star in Triangulum Australe

DoubleStar Triangulum Australe (TrA) Visible

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Observe

1Physical Properties

Magnitude 5.13

Spectral Type ApSi

Star Color Blue-white (B-V -0.08)

Distance 652 ly

2Position & Identifiers

RA 16h 46m 40.0s

Dec -67° 06' 35.0"

Constellation Triangulum Australe (TrA)

HR 6204

HIP 82129

HD 150549

Variable ID LP TrA

SIMBAD

3How easy to split?

Primary 5.1 mag Companion 11.5 mag Separation 32.7″

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

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 Triple

Components 3 (triple)

Component IDs AB

Separation 32.7″

Companion Mag 11.5

Position Angle 193°

Star Colors A: Blue-white

Discoverer HDO 257

Separation over time

Measured 1891 → 2000 (109 y)

Separation drift 30.0" → 32.7" (+2.70")

Rate +0.0248" / y

PA drift 180° → 193° (+13°, +0.119°/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.