When is the best time to observe HIP 86391?

HIP 86391 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 86391 located in the sky?

HIP 86391 lies in the constellation Ophiuchus at right ascension 17h 39m and declination +02° 02′.

What telescope do I need to split HIP 86391?

Splitting HIP 86391 requires an aperture of roughly 60 mm or larger — the components are separated by about 111.3″ at magnitudes near 6.3. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 86391 — Double Star in Ophiuchus

Magnitude 6.3^m DoubleStar Ophiuchus (Oph) Visible

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Observe

1Physical Properties

Magnitude 6.26

Spectral Type K0III+F4IV giant

Star Color Orange (B-V 1.03)

2Position & Identifiers

RA 17h 39m 08.5s

Dec +02° 01' 41.0"

Constellation Ophiuchus (Oph)

HR 6575

HIP 86391

HD 160315

SAO 122607

SIMBAD

3How easy to split?

Primary 6.3 mag Companion 7.8 mag Separation 111.3″

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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 May – Jul (peak: Jun)

5Multiple Star System Triple C: optical

Components 3 (triple)

Component IDs AB

Separation 111.3″

Companion Mag 7.8

Position Angle 328°

Star Colors A: Orange

Discoverer SHJ 251

Notes

Component B, F4IV CPM.

Separation over time

Measured 1840 → 2016 (176 y)

Separation drift 111.4" → 111.3" (-0.10")

Rate -0.0006" / y

PA drift 328° → 328° (+0°, +0.000°/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.