When is the best time to observe Sigma Puppis?

Sigma Puppis is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is Sigma Puppis located in the sky?

Sigma Puppis lies in the constellation Puppis at right ascension 07h 29m and declination -43° 18′.

What telescope do I need to split Sigma Puppis?

Splitting Sigma Puppis requires an aperture of roughly 60 mm or larger — the components are separated by about 22.1″ at magnitudes near 3.2. The companion is about 5.6 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Sigma Puppis — Double Star in Puppis

Magnitude 3.2^m DoubleStar Puppis (Pup) Visible

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Observe

1Physical Properties

Magnitude 3.25

Spectral Type K5III giant

Star Color Red (B-V 1.51)

Distance 184 ly

2Position & Identifiers

RA 07h 29m 13.8s

Dec -43° 18' 05.0"

Constellation Puppis (Pup)

HR 2878

HIP 36377

HD 59717

SAO 218755

Bayer Sigma

SIMBAD

3How easy to split?

Primary 3.3 mag Companion 8.8 mag Separation 22.1″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Easy	Easy	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 Dec – Feb (peak: Jan)

5Multiple Star System

Separation 22.1″

Companion Mag 8.8

Position Angle 74°

Star Colors A: Red

Discoverer DUN 51

Notes

CPM. Companion G5V.

Separation over time

Measured 1826 → 2016 (190 y)

Separation drift 18.0" → 22.1" (+4.10")

Rate +0.0216" / y

PA drift 90° → 74° (-16°, -0.084°/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.