When is the best time to observe HIP 100097?

HIP 100097 is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is HIP 100097 located in the sky?

HIP 100097 lies in the constellation Cygnus at right ascension 20h 18m and declination +55° 24′.

What telescope do I need to split HIP 100097?

Splitting HIP 100097 requires an aperture of roughly 100 mm or larger — the components are separated by about 3.9″ at magnitudes near 5.8. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 100097 — Double Star in Cygnus

Observable Double Star Excellent (62/100)

Sep: 3.9", Companion: mag 7.5

Magnitude 5.8^m DoubleStar Cygnus (Cyg) Visible

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Observe

1Physical Properties

Magnitude 5.76

Spectral Type A2V s

Star Color White (B-V 0.11)

Distance 1,087 ly

2Position & Identifiers

RA 20h 18m 24.8s

Dec +55° 23' 50.0"

Constellation Cygnus (Cyg)

HR 7781

HIP 100097

HD 193592

SAO 32455

Double Cat 13692

SIMBAD

3How easy to split?

Primary 5.8 mag Companion 7.5 mag Separation 3.9″

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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 Jun – Aug (peak: Jul)

5Multiple Star System Quadruple C,E: optical

Components 4 (quadruple)

Component IDs AB

Separation 3.9″

Companion Mag 7.5

Position Angle 338°

Star Colors A: White B: Yellow-white

Discoverer STF2671

Notes

AB binary. B is dF3.

Separation over time

Measured 1823 → 2023 (200 y)

Separation drift 4.0" → 3.9" (-0.10")

Rate -0.0005" / y

PA drift 340° → 338° (-2°, -0.010°/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.