When is the best time to observe HIP 100018?

HIP 100018 is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is HIP 100018 located in the sky?

HIP 100018 lies in the constellation Vulpecula at right ascension 20h 18m and declination +29° 09′.

What telescope do I need to split HIP 100018?

Splitting HIP 100018 requires an aperture of roughly 80 mm or larger — the components are separated by about 6.4″ at magnitudes near 6.2. The companion is about 4.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 100018 — Double Star in Vulpecula

Magnitude 6.2^m DoubleStar Vulpecula (Vul) Visible

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Observe

1Physical Properties

Magnitude 6.22

Spectral Type G9III giant

Star Color Orange (B-V 1.01)

Distance 362 ly

2Position & Identifiers

RA 20h 17m 31.5s

Dec +29° 08' 53.0"

Constellation Vulpecula (Vul)

HR 7760

HIP 100018

HD 193094

SAO 88473

Double Cat 13648

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 10.5 mag Separation 6.4″

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

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

Separation 6.4″

Companion Mag 10.5

Position Angle 66°

Star Colors A: Orange

Discoverer BU 441

Separation over time

Measured 1876 → 2016 (140 y)

Separation drift 5.9" → 6.4" (+0.50")

Rate +0.0036" / y

PA drift 65° → 66° (+1°, +0.007°/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.