When is the best time to observe HIP 87381?

HIP 87381 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 87381 located in the sky?

HIP 87381 lies in the constellation Scorpius at right ascension 17h 51m and declination -30° 33′.

What telescope do I need to split HIP 87381?

Splitting HIP 87381 requires an aperture of roughly 60 mm or larger — the components are separated by about 10.1″ at magnitudes near 6.7. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 87381 — Double Star in Scorpius

Magnitude 6.7^m DoubleStar Scorpius (Sco) Visible

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Observe

1Physical Properties

Magnitude 6.66

Spectral Type A0Vn

Star Color Blue-white (B-V 0.04)

2Position & Identifiers

RA 17h 51m 12.5s

Dec -30° 33' 26.0"

Constellation Scorpius (Sco)

HR 6645

HIP 87381

HD 162220

SAO 209357

SIMBAD

3How easy to split?

Primary 6.7 mag Companion 8.1 mag Separation 10.1″

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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 C: optical

Separation 10.1″

Companion Mag 8.1

Companion Sp B9V

Position Angle 189°

Star Colors A: Blue-white B: Blue-white

Discoverer PZ 5

Notes

Companion A0IV. Fixed sep.

Separation over time

Measured 1877 → 2018 (141 y)

Separation drift 9.9" → 10.1" (+0.20")

Rate +0.0014" / y

PA drift 189° → 189° (+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.