When is the best time to observe 53 Ophiuchi?

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

Where is 53 Ophiuchi located in the sky?

53 Ophiuchi lies in the constellation Ophiuchus at right ascension 17h 35m and declination +09° 35′.

What telescope do I need to split 53 Ophiuchi?

Splitting 53 Ophiuchi requires an aperture of roughly 60 mm or larger — the components are separated by about 40.8″ at magnitudes near 5.8. Larger apertures and steady seeing help resolve the pair cleanly.

53 Ophiuchi — Double Star in Ophiuchus

Observable Double Star Excellent (68/100)

Sep: 40.8", Companion: mag 7.5

Magnitude 5.8^m DoubleStar Ophiuchus (Oph) Visible

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Observe

1Physical Properties

Magnitude 5.81

Spectral Type A2V

Star Color White (B-V 0.02)

2Position & Identifiers

RA 17h 34m 36.7s

Dec +09° 35' 12.0"

Constellation Ophiuchus (Oph)

HR 6548

HIP 85998

HD 159480

SAO 122526

Flamsteed 53 Oph

Double Cat 10635

SIMBAD

3How easy to split?

Primary 5.8 mag Companion 7.5 mag Separation 40.8″

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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 Quadruple C: optical

Components 4 (quadruple)

Component IDs AB

Separation 40.8″

Companion Mag 7.5

Position Angle 190°

Star Colors A: White B: Yellow

Discoverer STFA 34

Notes

Component B, 7.81V, +0.30(B-V), +0.05(U-B), A8IV, vsini 129k/s. Fixed sep. from A.

Separation over time

Measured 1800 → 2024 (224 y)

Separation drift 42.6" → 40.8" (-1.80")

Rate -0.0080" / y

PA drift 196° → 190° (-6°, -0.027°/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.