When is the best time to observe Rho Ophiuchi?

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

Where is Rho Ophiuchi located in the sky?

Rho Ophiuchi lies in the constellation Ophiuchus at right ascension 16h 26m and declination -23° 27′.

What telescope do I need to split Rho Ophiuchi?

Splitting Rho Ophiuchi requires an aperture of roughly 100 mm or larger — the components are separated by about 3.2″ at magnitudes near 5.0. Larger apertures and steady seeing help resolve the pair cleanly.

Rho Ophiuchi — Double Star in Ophiuchus

HIP 80473; Rho Ophiuchi; 5 Ophiuchi

Observable Double Star Excellent (72/100)

Sep: 3.2", Companion: mag 5.7

Magnitude 5.0^m DoubleStar Ophiuchus (Oph) Visible

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Observe

1Physical Properties

Magnitude 5.02

Spectral Type B2IV subgiant

Star Color Yellow-white (B-V 0.24)

Distance 251 ly

2Position & Identifiers

RA 16h 25m 35.2s

Dec -23° 26' 50.0"

Constellation Ophiuchus (Oph)

HR 6112

HIP 80473

HD 147933

SAO 184382

Bayer Rho

Flamsteed 5 Oph

Double Cat 10049

SIMBAD Wikipedia

3How easy to split?

Primary 5.0 mag Companion 5.7 mag Separation 3.2″

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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 Apr – Jun (peak: May)

5Multiple Star System Quintuple

Components 5 (quintuple)

Component IDs AB

Separation 3.2″

Companion Mag 5.7

Companion Sp B2V

Position Angle 335°

Star Colors A: Yellow-white B: Blue

Discoverer H 2 19

Notes

Binary with HR 6113, combined colors. Combined mag. 4.63V. Component C, CoD-23d12862, 7.13v, B9n, 152" CPM, | vsini 180k/s; D, 6.56 B3V at 156", vsini 167k/s. E, 8.1v, 0.6" from D. DE is ADS 10045.

Separation over time

Measured 1832 → 2021 (189 y)

Separation drift 3.8" → 3.2" (-0.60")

Rate -0.0032" / y

PA drift 3° → 335° (-28°, -0.148°/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.