When is the best time to observe Pi Puppis?

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

Where is Pi Puppis located in the sky?

Pi Puppis lies in the constellation Puppis at right ascension 07h 17m and declination -37° 06′.

What telescope do I need to split Pi Puppis?

Splitting Pi Puppis requires an aperture of roughly 60 mm or larger — the components are separated by about 69.0″ at magnitudes near 2.7. The companion is about 5.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Pi Puppis — Double Star in Puppis

Magnitude 2.7^m DoubleStar Puppis (Pup) Visible

Star Map + List + Plan

About Pi Pup

Description

Pi Puppis is an orange supergiant of spectral type K3Ib at magnitude 2.70 in Puppis. Located about 810 light-years from Earth, it has a luminosity of roughly 7,000 times solar. It is the second brightest star in Puppis after Naos (Zeta Pup).

Observing Tips

Pi Pup lies in the eastern part of Puppis, in a region of the southern Milky Way rich in star clusters. The nearby cluster NGC 2451 is easily visible in binoculars. Its orange color stands out against the blue-white stars typical of this Milky Way region. Visible from the southern hemisphere and low northern latitudes. Best observed January through April.

History

Pi Puppis has no widely used traditional name. As part of the former Argo Navis, it was one of many stars reassigned when Lacaille divided the giant constellation in 1763.

Fun Facts

Pi Pup is physically associated with the open cluster NGC 2451 — it is the brightest member of this nearby cluster, which is easily visible to the naked eye as a hazy patch around the star.

Observe

1Physical Properties

Magnitude 2.70

Range 2.69 - 2.76

Variable Type LC

Spectral Type K3 IB supergiant

Star Color Orange (B-V 1.62) (reddened by dust)

Distance 805 ly

2Position & Identifiers

RA 07h 17m 08.6s

Dec -37° 05' 51.0"

Constellation Puppis (Pup)

HR 2773

HIP 35264

HD 56855

SAO 197795

Bayer Pi

SIMBAD

3How easy to split?

Primary 2.7 mag Companion 7.9 mag Separation 69.0″

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

Set a location in User Settings to see visibility data.

Best season Dec – Feb (peak: Jan)

5Multiple Star System

Separation 69.0″

Companion Mag 7.9

Position Angle 213°

Star Colors A: Orange (reddened by dust)

Discoverer DUN 43

Separation over time

Measured 1826 → 2015 (189 y)

Separation drift 72.6" → 69.0" (-3.60")

Rate -0.0190" / y

PA drift 214° → 213° (-1°, -0.005°/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.