When is the best time to observe 67 Ophiuchi?

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

Where is 67 Ophiuchi located in the sky?

67 Ophiuchi lies in the constellation Ophiuchus at right ascension 18h 01m and declination +02° 56′.

What telescope do I need to split 67 Ophiuchi?

Splitting 67 Ophiuchi requires an aperture of roughly 60 mm or larger — the components are separated by about 54.7″ at magnitudes near 4.0. The companion is about 4.1 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

67 Ophiuchi — Double Star in Ophiuchus

Observable Double Star Good (53/100)

Sep: 54.7", Companion: mag 8.1

DoubleStar Ophiuchus (Oph) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 3.97

Spectral Type B5Ib

Star Color White (B-V 0.02)

2Position & Identifiers

RA 18h 00m 38.7s

Dec +02° 55' 54.0"

Constellation Ophiuchus (Oph)

HR 6714

HIP 88192

HD 164353

Flamsteed 67 Oph

Double Cat 10966

SIMBAD

3How easy to split?

Primary 4.0 mag Companion 8.1 mag Separation 54.7″

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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 May – Jul (peak: Jun)

5Multiple Star System Quintuple

Components 5 (quintuple)

Component IDs AC

Separation 54.7″

Companion Mag 8.1

Companion Sp B2V

Position Angle 143°

Star Colors A: White C: Blue

Discoverer H 6 2

Notes

Component B, 13.7v F? at 7", optical. AC fixed. C, 8.12V, -0.02(B-V), -0.57(U-B), B1V, vsini 130k/s.

Separation over time

Measured 1823 → 2019 (196 y)

Separation drift 55.2" → 54.7" (-0.50")

Rate -0.0026" / y

PA drift 143° → 143° (+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.