When is the best time to observe HIP 39607?

HIP 39607 is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is HIP 39607 located in the sky?

HIP 39607 lies in the constellation Cancer at right ascension 08h 06m and declination +27° 32′.

What telescope do I need to split HIP 39607?

Splitting HIP 39607 requires an aperture of roughly 100 mm or larger — the components are separated by about 3.5″ at magnitudes near 6.2. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 39607 — Double Star in Cancer

Magnitude 6.2^m DoubleStar Cancer (Cnc) Visible

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Observe

1Physical Properties

Magnitude 6.21

Spectral Type A0V

Star Color Blue-white (B-V 0.01)

Distance 466 ly

2Position & Identifiers

RA 08h 05m 37.0s

Dec +27° 31' 47.0"

Constellation Cancer (Cnc)

HR 3164

HIP 39607

HD 66684

SAO 79928

Double Cat 6569

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 7.4 mag Separation 3.5″

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

5Multiple Star System

Separation 3.5″

Companion Mag 7.4

Position Angle 350°

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

Discoverer STF1177

Notes

Binary. Combined light and colors.

Separation over time

Measured 1827 → 2019 (192 y)

Separation drift 3.0" → 3.5" (+0.50")

Rate +0.0026" / y

PA drift 355° → 350° (-5°, -0.026°/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.