When is the best time to observe HIP 105660?

HIP 105660 is best observed from July through September, with peak visibility during August when it transits around midnight in the Northern Hemisphere.

Where is HIP 105660 located in the sky?

HIP 105660 lies in the constellation Vulpecula at right ascension 21h 24m and declination +25° 19′.

What telescope do I need to split HIP 105660?

Splitting HIP 105660 requires an aperture of roughly 60 mm or larger — the components are separated by about 65.3″ at magnitudes near 6.2. The companion is about 4.8 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

HIP 105660 — Double Star in Vulpecula

DoubleStar Vulpecula (Vul) Visible

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Observe

1Physical Properties

Magnitude 6.15

Spectral Type A2V

2Position & Identifiers

RA 21h 24m 07.4s

Dec +25° 18' 44.0"

Constellation Vulpecula (Vul)

HR 8194

HIP 105660

HD 203858

Double Cat 14943

SIMBAD

3How easy to split?

Primary 6.2 mag Companion 11.0 mag Separation 65.3″

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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	Medium+	Medium+

Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

4Visibility

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Best season Jul – Sep (peak: Aug)

5Multiple Star System Sextuple

Components 6 (sextuple)

Component IDs AE

Separation 65.3″

Companion Mag 11.0

Position Angle 116°

Discoverer BU 447

Notes

ADS 14943A. All companions 10.5m or fainter.

Separation over time

Measured 1891 → 2015 (124 y)

Separation drift 68.0" → 65.3" (-2.70")

Rate -0.0218" / y

PA drift 114° → 116° (+2°, +0.016°/y)

Apparent motion is significant on a human timescale — worth revisiting in a decade.

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.