When is the best time to observe Omega Lupi?

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

Where is Omega Lupi located in the sky?

Omega Lupi lies in the constellation Lupus at right ascension 15h 38m and declination -42° 34′.

What telescope do I need to split Omega Lupi?

Splitting Omega Lupi requires an aperture of roughly 60 mm or larger — the components are separated by about 11.8″ at magnitudes near 4.3. The companion is about 6.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Omega Lupi — Double Star in Lupus

Magnitude 4.3^m DoubleStar Lupus (Lup) Visible

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Observe

1Physical Properties

Magnitude 4.33

Spectral Type K4.5III giant

Star Color Red (B-V 1.42)

Distance 192 ly

2Position & Identifiers

RA 15h 38m 03.2s

Dec -42° 34' 03.0"

Constellation Lupus (Lup)

HR 5797

HIP 76552

HD 139127

SAO 226004

Bayer Omega

SIMBAD

3How easy to split?

Primary 4.3 mag Companion 11.2 mag Separation 11.8″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard	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

Separation 11.8″

Companion Mag 11.2

Position Angle 30°

Star Colors A: Red

Discoverer HDO 250

Notes

CPM.

Separation over time

Measured 1891 → 2016 (125 y)

Separation drift 15.0" → 11.8" (-3.20")

Rate -0.0256" / y

PA drift 10° → 30° (+20°, +0.160°/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.