When is the best time to observe HIP 39974?

HIP 39974 is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is HIP 39974 located in the sky?

HIP 39974 lies in the constellation Puppis at right ascension 08h 10m and declination -42° 38′.

What telescope do I need to split HIP 39974?

Splitting HIP 39974 requires an aperture of roughly 80 mm or larger — the components are separated by about 5.6″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 39974 — Double Star in Puppis

Magnitude 6.3^m DoubleStar Puppis (Pup) Visible

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Observe

1Physical Properties

Magnitude 6.26

Spectral Type B7V

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

Distance 192 ly

2Position & Identifiers

RA 08h 09m 47.7s

Dec -42° 38' 26.0"

Constellation Puppis (Pup)

HR 3205

HIP 39974

HD 68242

SAO 219507

SIMBAD

3How easy to split?

Primary 6.3 mag Companion 7.5 mag Separation 5.6″

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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

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Best season Dec – Feb (peak: Jan)

5Multiple Star System

Separation 5.6″

Companion Mag 7.5

Position Angle 83°

Star Colors A: Blue-white B: Yellow-white

Discoverer DUN 63

Notes

Components B6V and B9V.

Separation over time

Measured 1836 → 2015 (179 y)

Separation drift 6.0" → 5.6" (-0.40")

Rate -0.0022" / y

PA drift 81° → 83° (+2°, +0.011°/y)

Essentially fixed on human timescales — the same view your grandchildren will see.

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.