When is the best time to observe HIP 31593?

HIP 31593 is best observed from November through January, with peak visibility during December when it transits around midnight in the Northern Hemisphere.

Where is HIP 31593 located in the sky?

HIP 31593 lies in the constellation Canis Major at right ascension 06h 37m and declination -22° 37′.

What telescope do I need to split HIP 31593?

Splitting HIP 31593 requires an aperture of roughly 80 mm or larger — the components are separated by about 9.0″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 31593 — Double Star in Canis Major

Magnitude 6.3^m DoubleStar Canis Major (CMa) Visible

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Observe

1Physical Properties

Magnitude 6.35

Spectral Type B5V

Star Color Blue (B-V -0.11)

Distance 272 ly

2Position & Identifiers

RA 06h 36m 40.9s

Dec -22° 36' 54.0"

Constellation Canis Major (CMa)

HR 2433

HIP 31593

HD 47247

SAO 172021

Double Cat 5260

SIMBAD

3How easy to split?

Primary 6.4 mag Companion 9.3 mag Separation 9.0″

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

5Multiple Star System C: optical

Separation 9.0″

Companion Mag 9.3

Position Angle 336°

Star Colors A: Blue B: Yellow-white

Discoverer H 2 60

Notes

Companion A2V.

Separation over time

Measured 1835 → 2021 (186 y)

Separation drift 15.0" → 9.0" (-6.00")

Rate -0.0323" / y

PA drift 327° → 336° (+9°, +0.048°/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.