When is the best time to observe QR Vulpeculae?

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

Where is QR Vulpeculae located in the sky?

QR Vulpeculae lies in the constellation Vulpecula at right ascension 20h 15m and declination +25° 36′.

What telescope do I need to split QR Vulpeculae?

Splitting QR Vulpeculae requires an aperture of roughly 760 mm or larger — the components are separated by about 0.4″ at magnitudes near 4.8. Larger apertures and steady seeing help resolve the pair cleanly.

QR Vulpeculae — Double Star in Vulpecula

DoubleStar Vulpecula (Vul) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 4.78

Range 4.60 - 4.81

Variable Type Gamma Cassiopeiae (Eruptive Be Star)

Spectral Type B3Ve

Star Color Blue (B-V -0.18)

2Position & Identifiers

RA 20h 15m 15.9s

Dec +25° 35' 31.0"

Constellation Vulpecula (Vul)

HR 7739

HIP 99824

HD 192685

Variable ID QR Vul

Double Cat 13589

SIMBAD

3How easy to split?

Primary 4.8 mag Companion 7.6 mag Separation 0.4″

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Telescope	Bortle 3	Bortle 4	Bortle 5
80 mm refractor 80mm refr.	V. hard	V. hard	V. hard
150 mm Newton 150mm Newt.	V. hard	V. hard	V. hard
Celestron C8 (203 mm SCT) C8 203mm	V. hard	V. hard	V. hard

Easy Medium Hard Very hard Impossible

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

To reach "Medium" at Bortle 3, you'd need at least a 760 mm reflector.

4Visibility

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Best season Jun – Aug (peak: Jul)

5Multiple Star System Triple

Components 3 (triple)

Component IDs AB

Separation 0.4″

Companion Mag 7.5

Position Angle 190°

Star Colors A: Blue B: Yellow-white

Discoverer BU 983

Notes

AB CPM, 680?y.

Separation over time

Measured 1879 → 2016 (137 y)

Separation drift 0.80" → 0.40" (-0.40")

Rate -0.0029" / y

PA drift 154° → 190° (+36°, +0.263°/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.