When is the best time to observe HIP 108456?

HIP 108456 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 108456 located in the sky?

HIP 108456 lies in the constellation Cepheus at right ascension 21h 58m and declination +82° 52′.

What telescope do I need to split HIP 108456?

Splitting HIP 108456 requires an aperture of roughly 60 mm or larger — the components are separated by about 13.7″ at magnitudes near 7.0. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 108456 — Double Star in Cepheus

Magnitude 7.0^m DoubleStar Cepheus (Cep) Visible

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Observe

1Physical Properties

Magnitude 6.98

Spectral Type F6IV-V subgiant

Star Color Yellow (B-V 0.52)

Distance 297 ly

2Position & Identifiers

RA 21h 58m 12.7s

Dec +82° 52' 11.0"

Constellation Cepheus (Cep)

HR 8423

HIP 108456

HD 209942

SAO 3673

Double Cat 15571

SIMBAD

3How easy to split?

Primary 7.0 mag Companion 7.5 mag Separation 13.7″

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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 Jul – Sep (peak: Aug)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 13.7″

Companion Mag 7.5

Companion Sp K5V

Position Angle 65°

Star Colors A: Yellow B: Red

Discoverer STF2873

Notes

AB binary.

Separation over time

Measured 1825 → 2024 (199 y)

Separation drift 13.6" → 13.7" (+0.10")

Rate +0.0005" / y

PA drift 78° → 65° (-13°, -0.065°/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.