When is the best time to observe HIP 31509?

HIP 31509 is best observed from November through January, with peak visibility during December when it transits around midnight in the Northern Hemisphere.

Where is HIP 31509 located in the sky?

HIP 31509 lies in the constellation Columba at right ascension 06h 36m and declination -36° 05′.

What telescope do I need to split HIP 31509?

Splitting HIP 31509 requires an aperture of roughly 60 mm or larger — the components are separated by about 287.2″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 31509 — Double Star in Columba

Magnitude 6.3^m DoubleStar Columba (Col) Visible

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Observe

1Physical Properties

Magnitude 6.35

Spectral Type G0V

Star Color Yellow (B-V 0.48)

Distance 116 ly

2Position & Identifiers

RA 06h 35m 54.0s

Dec -36° 05' 20.0"

Constellation Columba (Col)

HR 2431

HIP 31509

HD 47230

SAO 196987

SIMBAD

3How easy to split?

Primary 6.4 mag Companion 7.3 mag Separation 287.2″

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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 287.2″

Companion Mag 7.3

Companion Sp G1V

Position Angle 129°

Star Colors A: Yellow B: Yellow

Discoverer SHY 185

Notes

6.9 G0V, 7.3 G1V, 29.0y, a = 0.295". Combined mag., color.

Separation over time

Measured 1913 → 2015 (102 y)

Separation drift 287.6" → 287.2" (-0.40")

Rate -0.0039" / y

PA drift 129° → 129° (+0°, +0.000°/y)

Slow change over generations — observable in lifetime comparisons.

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.