When is the best time to observe HIP 91235?

HIP 91235 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 91235 located in the sky?

HIP 91235 lies in the constellation Lyra at right ascension 18h 37m and declination +33° 28′.

What telescope do I need to split HIP 91235?

Splitting HIP 91235 requires an aperture of roughly 80 mm or larger — the components are separated by about 7.2″ at magnitudes near 5.4. The companion is about 4.0 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 91235 — Double Star in Lyra

Magnitude 5.4^m DoubleStar Lyra (Lyr) Visible

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Observe

1Physical Properties

Magnitude 5.42

Range 5.40 - 5.45

Variable Type ACV:

Spectral Type B8II-IIIpHg bright giant

Star Color Blue-white (B-V -0.10)

Distance 466 ly

2Position & Identifiers

RA 18h 36m 37.2s

Dec +33° 28' 08.0"

Constellation Lyra (Lyr)

HR 6997

HIP 91235

HD 172044

SAO 67164

Double Cat 11504

SIMBAD

3How easy to split?

Primary 5.4 mag Companion 9.4 mag Separation 7.2″

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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 May – Jul (peak: Jun)

5Multiple Star System

Separation 7.2″

Companion Mag 9.4

Position Angle 204°

Star Colors A: Blue-white B: Yellow

Discoverer STF2349

Separation over time

Measured 1830 → 2016 (186 y)

Separation drift 7.3" → 7.2" (-0.10")

Rate -0.0005" / y

PA drift 206° → 204° (-2°, -0.011°/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.