When is the best time to observe Lambda Centauri?

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

Where is Lambda Centauri located in the sky?

Lambda Centauri lies in the constellation Centaurus at right ascension 11h 36m and declination -63° 01′.

What telescope do I need to split Lambda Centauri?

Splitting Lambda Centauri requires an aperture of roughly 200 mm or larger — the components are separated by about 14.8″ at magnitudes near 3.1. The companion is about 8.4 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Lambda Centauri — Double Star in Centaurus

Magnitude 3.1^m DoubleStar Centaurus (Cen) Visible

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1Physical Properties

Magnitude 3.13

Spectral Type A1III giant

Star Color Blue-white (B-V -0.04)

Distance 419 ly

2Position & Identifiers

RA 11h 35m 46.8s

Dec -63° 01' 11.0"

Constellation Centaurus (Cen)

HR 4467

HIP 56561

HD 100841

SAO 251472

Bayer Lambda

SIMBAD

3How easy to split?

Primary 3.1 mag Companion 11.5 mag Separation 14.8″

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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.	Hard	Hard	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 200 mm reflector.

4Visibility

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Best season Feb – Apr (peak: Mar)

5Multiple Star System

Separation 14.8″

Companion Mag 11.5

Position Angle 326°

Star Colors A: Blue-white

Discoverer RST3746

Notes

Companion B9V, optical.

Separation over time

Measured 1937 → 2015 (78 y)

Separation drift 16.6" → 14.8" (-1.80")

Rate -0.0231" / y

PA drift 315° → 326° (+11°, +0.141°/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.