When is the best time to observe HIP 39675?

HIP 39675 is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is HIP 39675 located in the sky?

HIP 39675 lies in the constellation Monoceros at right ascension 08h 06m and declination -09° 15′.

What telescope do I need to split HIP 39675?

Splitting HIP 39675 requires an aperture of roughly 60 mm or larger — the components are separated by about 30.6″ at magnitudes near 6.2. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 39675 — Double Star in Monoceros

Magnitude 6.2^m DoubleStar Monoceros (Mon) Visible

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Observe

1Physical Properties

Magnitude 6.23

Spectral Type B9V

Star Color Blue-white (B-V -0.07)

2Position & Identifiers

RA 08h 06m 27.5s

Dec -09° 14' 42.0"

Constellation Monoceros (Mon)

HR 3174

HIP 39675

HD 67159

SAO 135505

Double Cat 6588

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 7.8 mag Separation 30.6″

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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 Quadruple

Components 4 (quadruple)

Component IDs AB

Separation 30.6″

Companion Mag 7.8

Companion Sp A0

Position Angle 327°

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

Discoverer STF1183

Notes

B is A0. BC double 8.6, 13.0 sep. 1".

Separation over time

Measured 1831 → 2019 (188 y)

Separation drift 30.0" → 30.6" (+0.60")

Rate +0.0032" / y

PA drift 327° → 327° (+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.