When is the best time to observe HIP 89234?

HIP 89234 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 89234 located in the sky?

HIP 89234 lies in the constellation Apus at right ascension 18h 13m and declination -73° 40′.

What telescope do I need to split HIP 89234?

Splitting HIP 89234 requires an aperture of roughly 150 mm or larger — the components are separated by about 1.9″ at magnitudes near 5.8. The companion is about 3.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 89234 — Double Star in Apus

Magnitude 5.8^m DoubleStar Apus (Aps) Visible

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Observe

1Physical Properties

Magnitude 5.85

Spectral Type F5V

Star Color Yellow-white (B-V 0.46)

Distance 105 ly

2Position & Identifiers

RA 18h 12m 34.5s

Dec -73° 40' 18.0"

Constellation Apus (Aps)

HR 6751

HIP 89234

HD 165259

SAO 257571

SIMBAD

3How easy to split?

Primary 5.9 mag Companion 9.1 mag Separation 1.9″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard+	V. hard+	V. hard+
150 mm Newton 150mm Newt.	Hard	Hard	Hard
Celestron C8 (203 mm SCT) C8 203mm	Medium	Medium	Medium

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

Separation 1.9″

Companion Mag 9.1

Position Angle 273°

Star Colors A: Yellow-white B: Orange

Discoverer HDO 284

Separation over time

Measured 1891 → 2022 (131 y)

Separation drift 1.0" → 1.9" (+0.90")

Rate +0.0069" / y

PA drift 210° → 273° (+63°, +0.481°/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.