When is the best time to observe Nu Aquilae?

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

Where is Nu Aquilae located in the sky?

Nu Aquilae lies in the constellation Aquila at right ascension 19h 27m and declination +00° 20′.

What telescope do I need to split Nu Aquilae?

Splitting Nu Aquilae requires an aperture of roughly 60 mm or larger — the components are separated by about 200.5″ at magnitudes near 4.7. 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.

Nu Aquilae — Double Star in Aquila

Magnitude 4.7^m DoubleStar Aquila (Aql) Visible

Star Map + List + Plan

Observe

1Physical Properties

Magnitude 4.66

Spectral Type F2Ib supergiant

Star Color Yellow (B-V 0.60)

2Position & Identifiers

RA 19h 26m 31.1s

Dec +00° 20' 19.0"

Constellation Aquila (Aql)

HR 7387

HIP 95585

HD 182835

SAO 124628

Bayer Nu

Flamsteed 32 Aql

SIMBAD

3How easy to split?

Primary 4.7 mag Companion 9.5 mag Separation 200.5″

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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

Separation 200.5″

Companion Mag 9.5

Position Angle 287°

Star Colors A: Yellow B: Red

Discoverer BU 1469

Notes

Colors of B are +0.31(B-V), +0.16(U-B).

Separation over time

Measured 1892 → 2012 (120 y)

Separation drift 200.9" → 200.5" (-0.40")

Rate -0.0033" / y

PA drift 288° → 287° (-1°, -0.008°/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.