When is the best time to observe HIP 31190?

HIP 31190 is best observed from November through January, with peak visibility during December when it transits around midnight in the Northern Hemisphere.

Where is HIP 31190 located in the sky?

HIP 31190 lies in the constellation Canis Major at right ascension 06h 33m and declination -32° 02′.

What telescope do I need to split HIP 31190?

Splitting HIP 31190 requires an aperture of roughly 60 mm or larger — the components are separated by about 24.7″ at magnitudes near 5.7. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 31190 — Double Star in Canis Major

Observable Double Star Good (52/100)

Sep: 24.7", Companion: mag 7.9

Magnitude 5.7^m DoubleStar Canis Major (CMa) Visible

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Observe

1Physical Properties

Magnitude 5.69

Range 5.64 - 5.76

Variable Type Gamma Cassiopeiae (Eruptive Be Star)

Spectral Type B2IVe supergiant

Star Color Blue (B-V -0.17)

2Position & Identifiers

RA 06h 32m 39.0s

Dec -32° 01' 50.0"

Constellation Canis Major (CMa)

HR 2397

HIP 31190

HD 46547

SAO 196919

Variable ID Var

SIMBAD

3How easy to split?

Primary 5.7 mag Companion 7.9 mag Separation 24.7″

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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 Nov – Jan (peak: Dec)

5Multiple Star System

Separation 24.7″

Companion Mag 7.9

Position Angle 258°

Star Colors A: Blue B: White

Discoverer HJ 3869

Notes

Companion 8.70V, -0.08(B-V), -0.40(U-B), A0V, optical?

Separation over time

Measured 1836 → 2010 (174 y)

Separation drift 27.5" → 24.7" (-2.80")

Rate -0.0161" / y

PA drift 250° → 258° (+8°, +0.046°/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.