When is the best time to observe HIP 99679?

HIP 99679 is best observed from June through August, with peak visibility during July when it transits around midnight in the Northern Hemisphere.

Where is HIP 99679 located in the sky?

HIP 99679 lies in the constellation Vulpecula at right ascension 20h 14m and declination +24° 14′.

What telescope do I need to split HIP 99679?

Splitting HIP 99679 requires an aperture of roughly 100 mm or larger — the components are separated by about 2.9″ at magnitudes near 6.6. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 99679 — Double Star in Vulpecula

Magnitude 6.6^m DoubleStar Vulpecula (Vul) Visible

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Observe

1Physical Properties

Magnitude 6.56

Spectral Type A1m

Star Color White (B-V 0.29)

Distance 297 ly

2Position & Identifiers

RA 20h 13m 40.6s

Dec +24° 14' 20.0"

Constellation Vulpecula (Vul)

HR 7723

HIP 99679

HD 192342

SAO 88377

Double Cat 13543

SIMBAD

3How easy to split?

Primary 6.6 mag Companion 9.2 mag Separation 2.9″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	Hard+	Hard+	Hard+
150 mm Newton 150mm Newt.	Medium+	Medium+	Medium+
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

Separation 2.9″

Companion Mag 9.2

Position Angle 277°

Star Colors A: White B: Yellow

Discoverer STF2653

Notes

Binary.

Separation over time

Measured 1831 → 2020 (189 y)

Separation drift 2.5" → 2.9" (+0.40")

Rate +0.0021" / y

PA drift 255° → 277° (+22°, +0.116°/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.