When is the best time to observe HIP 91707?

HIP 91707 is best observed from May through July, with peak visibility during June when it transits around midnight in the Northern Hemisphere.

Where is HIP 91707 located in the sky?

HIP 91707 lies in the constellation Lyra at right ascension 18h 42m and declination +34° 45′.

What telescope do I need to split HIP 91707?

Splitting HIP 91707 requires an aperture of roughly 60 mm or larger — the components are separated by about 25.0″ at magnitudes near 6.5. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 91707 — Double Star in Lyra

Magnitude 6.5^m DoubleStar Lyra (Lyr) Visible

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Observe

1Physical Properties

Magnitude 6.47

Spectral Type B5V

Star Color Blue (B-V -0.13)

2Position & Identifiers

RA 18h 42m 08.1s

Dec +34° 44' 48.0"

Constellation Lyra (Lyr)

HR 7033

HIP 91707

HD 173087

SAO 67265

Double Cat 11593

SIMBAD

3How easy to split?

Primary 6.5 mag Companion 7.7 mag Separation 25.0″

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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 B: optical

Components 4 (quadruple)

Component IDs AP

Separation 25.0″

Companion Mag 7.7

Position Angle 82°

Star Colors A: Blue

Discoverer STF2372

Notes

AB fixed, B at 25", 8.05V, -0.05(B-V), -0.25(U-B), B8V, vsini 150k/s. AP, measured sep. 0.145 on 1985.5 by speckle | interferometry.

Separation over time

Measured 1782 → 2019 (237 y)

Separation drift 22.9" → 25.0" (+2.10")

Rate +0.0089" / y

PA drift 85° → 82° (-3°, -0.013°/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.