When is the best time to observe 23 Aquilae?

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

Where is 23 Aquilae located in the sky?

23 Aquilae lies in the constellation Aquila at right ascension 19h 19m and declination +01° 05′.

What telescope do I need to split 23 Aquilae?

Splitting 23 Aquilae requires an aperture of roughly 100 mm or larger — the components are separated by about 3.3″ at magnitudes near 5.1. The companion is about 3.2 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

23 Aquilae — Double Star in Aquila

Observable Double Star Good (54/100)

Sep: 3.3", Companion: mag 8.3

Magnitude 5.1^m DoubleStar Aquila (Aql) Visible

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Observe

1Physical Properties

Magnitude 5.10

Spectral Type K2II-III bright giant

Star Color Red (B-V 1.15)

Distance 1,087 ly

2Position & Identifiers

RA 19h 18m 32.5s

Dec +01° 05' 07.0"

Constellation Aquila (Aql)

HR 7319

HIP 94885

HD 180972

SAO 124487

Flamsteed 23 Aql

Double Cat 12289

SIMBAD

3How easy to split?

Primary 5.1 mag Companion 8.3 mag Separation 3.3″

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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	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 Triple

Components 3 (triple)

Component IDs AB

Separation 3.3″

Companion Mag 8.3

Position Angle 2°

Star Colors A: Red

Discoverer STF2492

Notes

AB binary. C, 13.7v at 12" optical.

Separation over time

Measured 1827 → 2016 (189 y)

Separation drift 2.5" → 3.3" (+0.80")

Rate +0.0042" / y

PA drift 20° → 2° (-18°, -0.095°/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.